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Journal Cover American Journal of Clinical Nutrition
  [SJR: 3.771]   [H-I: 262]   [151 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0002-9165 - ISSN (Online) 1938-3207
   Published by American Society for Nutrition Homepage  [3 journals]
  • Supplement--Iron Screening and Supplementation in Iron-Replete Pregnant
           Women and Young Children TOC link [Supplement-Iron Screening and
           Supplementation in Iron-Replete Pregnant Women and Young Children TOC
    • Pages: 998 - 998
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.998
      Issue No: Vol. 106, No. 6 (2017)
  • Brain stimulation for treatment of obesity: will stimulating the
           prefrontal cortex reduce overeating' [Editorials]
    • Authors: Keller K. L.
      Pages: 1331 - 1332
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.169631
      Issue No: Vol. 106, No. 6 (2017)
  • Muscling out from under the yolk of the eggs "bad" reputation [Editorials]
    • Authors: Phillips S. M.
      Pages: 1333 - 1334
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.169615
      Issue No: Vol. 106, No. 6 (2017)
  • Why might the finding of a new genetic association with inflammatory bowel
           disease be of potential value in disease control' [Editorials]
    • Authors: Ferguson L. R.
      Pages: 1335 - 1336
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.169623
      Issue No: Vol. 106, No. 6 (2017)
  • Comparison among criteria to define successful weight-loss maintainers and
           regainers in the Action for Health in Diabetes (Look AHEAD) and Diabetes
           Prevention Program trials [Obesity and eating disorders]
    • Authors: Berger, S. E; Huggins, G. S, McCaffery, J. M, Lichtenstein, A. H.
      Pages: 1337 - 1346
      Abstract: Background: Given the low rates of successful weight maintenance after lifestyle-induced weight loss, it is critical to develop approaches that distinguish successful weight-loss maintainers from regainers.Objective: The aim of this study was to compare published categorization criteria that differentiate maintainers and regainers via quantitative agreement.Design: The study used publicly available data from Look AHEAD (Action for Health in Diabetes; n = 1791) and Diabetes Prevention Program (DPP; n = 613) participants with ≥3% initial weight loss after lifestyle interventions and 4-y follow-up data. Eight previously published criteria defining maintainers and regainers were compared with respect to number of participants and concordance via agreement statistics. Criteria were assessed separately among those with 3–9% and ≥10% initial weight loss.Results: Regainers had higher body weight at year 4 than did maintainers (mean difference range: 6.6–11.9 kg in Look AHEAD; 11.5–14.6 kg in DPP; P < 0.0001). Assessing concordance among criteria, agreement was dependent on initial weight loss. Among those with 3–9% initial weight loss in both cohorts, 9 of 28 comparisons were concordant (agreement ≥80%). Among those with ≥10% initial weight loss, 7 of 28 comparisons in Look AHEAD and 13 of 28 in the DPP were in high agreement. The definition of successful weight-loss maintenance "regaining ≤25% of initial weight loss during maintenance" showed high agreement with the most commonly used definition of "staying ≥10% below initial weight" among those with ≥10% initial weight loss (agreement: 85.0% in Look AHEAD; 87.4% in DPP). The same definition of ≤25% regain showed high agreement with the definition of staying ≥5% below initial weight among those with 3–9% initial weight loss (agreement: 91.6% in Look AHEAD; 90.5% in DPP).Conclusions: Although all of the criteria discriminated on the basis of weight loss, many showed low agreement, which limited cross-study comparisons. Among criteria with high agreement, the definition of successful weight maintenance "regaining ≤25% of initial weight loss during maintenance" is a preferred definition of success, given the realistic challenges of maintaining 100% weight loss and flexible application in populations with high initial weight-loss variations. This trial was registered at as NCT00017953 (Look AHEAD) and NCT00004992 (DPP).
      Keywords: Obesity and Metabolism Research Articles
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.157446
      Issue No: Vol. 106, No. 6 (2017)
  • Neuromodulation directed at the prefrontal cortex of subjects with obesity
           reduces snack food intake and hunger in a randomized trial [Obesity and
           eating disorders]
    • Authors: Heinitz, S; Reinhardt, M, Piaggi, P, Weise, C. M, Diaz, E, Stinson, E. J, Venti, C, Votruba, S. B, Wassermann, E. M, Alonso-Alonso, M, Krakoff, J, Gluck, M. E.
      Pages: 1347 - 1357
      Abstract: Background: Obesity is associated with reduced activation in the left dorsolateral prefrontal cortex (DLPFC), a region of the brain that plays a key role in the support of self-regulatory aspects of eating behavior and inhibitory control. Transcranial direct current stimulation (tDCS) is a noninvasive technique used to modulate brain activity.Objectives: We tested whether repeated anodal tDCS targeted at the left DLPFC (compared with sham tDCS) has an immediate effect on eating behavior during ad libitum food intake, resulting in weight change, and whether it might influence longer-term food intake–related appetite ratings in individuals with obesity.Design: In a randomized parallel-design study combining inpatient and outpatient assessments over 31 d, 23 individuals with obesity [12 men; mean ± SD body mass index (BMI; in kg/m2): 39.3 ± 8.42] received 15 sessions of anodal (i.e., enhancing cortical activity) or sham tDCS aimed at the left DLPFC. Ad libitum food intake was assessed through the use of a vending machine paradigm and snack food taste tests (SFTTs). Appetite was evaluated with a visual analog scale (VAS). Body weight was measured. We examined the effect of short-term (i.e., 3 sessions) and long-term (i.e., 15 sessions) tDCS on these variables.Results: Relative to sham tDCS, short-term anodal tDCS did not influence ad libitum intake of food from the vending machines. Accordingly, no effect on short-term or 4-wk weight change was observed. In the anodal tDCS group, compared with the sham group, VAS ratings for hunger and the urge to eat declined significantly more (P = 0.01 and P = 0.05, respectively), and total energy intake during an SFTT was relatively lower in satiated individuals (P = 0.01), after long-term tDCS.Conclusions: Short-term anodal tDCS of the left DLPFC did not have an immediate effect on ad libitum food intake or thereby weight change, relative to sham tDCS. Hunger and snack food intake were reduced only after a longer period of anodal tDCS in individuals with obesity. This trial was registered at as NCT00739362.
      Keywords: Obesity and Metabolism Research Articles
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.158089
      Issue No: Vol. 106, No. 6 (2017)
  • Differential impact of the cheese matrix on the postprandial lipid
           response: a randomized, crossover, controlled trial [Lipids]
    • Authors: Drouin-Chartier, J.-P; Tremblay, A. J, Maltais-Giguere, J, Charest, A, Guinot, L, Rioux, L.-E, Labrie, S, Britten, M, Lamarche, B, Turgeon, S. L, Couture, P.
      Pages: 1358 - 1365
      Abstract: Background: In a simulated gastrointestinal environment, the cheese matrix modulates dairy fat digestion. However, to our knowledge, the impact of the cheese matrix on postprandial lipemia in humans has not yet been evaluated.Objective: In healthy subjects, we compared the impact of dairy fat provided from firm cheese, soft cream cheese, and butter on the postprandial response at 4 h and on the incremental area under the curve (iAUC) of plasma triglycerides.Design: Forty-three healthy subjects were recruited to this randomized, crossover, controlled trial. In random order at intervals of 14 d and after a 12-h fast, subjects ingested 33 g fat from a firm cheese (young cheddar), a soft cream cheese (cream cheese), or butter (control) incorporated into standardized meals that were matched for macronutrient content. Plasma concentrations of triglycerides were measured immediately before the meal and 2, 4, 6, and 8 h after the meal.Results: Cheddar cheese, cream cheese, and butter induced similar increases in triglyceride concentrations at 4 h (change from baseline: +59%, +59%, and +62%, respectively; P = 0.9). No difference in the triglyceride iAUC0–8 h (P-meal = 0.9) was observed between the 3 meals. However, at 2 h, the triglyceride response caused by the cream cheese (change from baseline: +44%) was significantly greater than that induced by butter (change from baseline: +24%; P = 0.002) and cheddar cheese (change from baseline: +16%; P = 0.0004). At 6 h, the triglyceride response induced by cream cheese was significantly attenuated compared with that induced by cheddar cheese (change from baseline: +14% compared with +42%; P = 0.0004).Conclusion: This study demonstrates that the cheese matrix modulates the impact of dairy fat on postprandial lipemia in healthy subjects. This trial was registered at as NCT02623790.
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.165027
      Issue No: Vol. 106, No. 6 (2017)
  • Functional vitamin B-6 status and long-term mortality in renal transplant
           recipients [Nutritional status, dietary intake, and body composition]
    • Authors: Minovic, I; van der Veen, A, van Faassen, M, Riphagen, I. J, van den Berg, E, van der Ley, C, Gomes-Neto, A. W, Geleijnse, J. M, Eggersdorfer, M, Navis, G. J, Kema, I. P, Bakker, S. J.
      Pages: 1366 - 1374
      Abstract: Background: Low plasma concentrations of pyridoxal 5'-phosphate (PLP) are common in renal transplant recipients (RTRs) and confer increased risk of long-term mortality. To our knowledge, it is not known whether low plasma PLP concentrations have functional (i.e., intracellular) consequences and, if so, whether such consequences are associated with increased risk of mortality.Objectives: We assessed the association of plasma PLP with functional vitamin B-6 status and explored the potential association of functional vitamin B-6 status with long-term mortality in RTRs.Design: In a longitudinal cohort of 678 stable RTRs with a median follow-up of 5.3 y (IQR: 4.8–6.1 y) and 297 healthy controls, PLP, plasma 3-hydroxykynurenine (3-HK), and xanthurenic acid (XA) were analyzed via validated assays. PLP was used as direct biomarker for vitamin B-6 status, and the 3-HK:XA ratio was used as functional biomarker of vitamin B-6 status with a higher ratio reflecting worse functional vitamin B-6 status.Results: Median PLP, 3-HK, and XA concentrations were 41 nmol/L (IQR: 29–60 nmol/L), 40.1 nmol/L (IQR: 33.0–48.0 nmol/L), and 19.1 nmol/L (IQR: 14.5–24.9 nmol/L), respectively, in healthy controls compared with 29 nmol/L (IQR: 17–50 nmol/L), 61.5 nmol/L (IQR: 45.6–86.5 nmol/L), and 25.5 nmol/L (IQR: 17.2–40.0 nmol/L), respectively, in RTRs (all P < 0.001). RTRs had a higher median 3-HK:XA ratio (2.38; IQR: 1.68–3.49) than did healthy controls (2.13; IQR: 1.63–2.71) (P < 0.05). In RTRs, the 3-HK:XA ratio was inversely associated with plasma PLP (β = –0.21, P < 0.001). Moreover, a higher 3-HK:XA ratio was independently associated with increased risk of all-cause mortality (HR per SD increment: 1.30; 95% CI: 1.13, 1.49), cancer mortality (HR per SD increment: 1.47; 95% CI: 1.12, 1.95), and infectious disease mortality (HR per SD increment: 1.50; 95% CI: 1.21, 1.86) in RTRs.Conclusions: Vitamin B-6–deficient RTRs have a worse functional vitamin B-6 status than do healthy controls and vitamin B-6–sufficient RTRs. Worse functional vitamin B-6 status in RTRs is independently associated with an increased risk of mortality particularly because of cancer and infectious disease. This trial was registered at as NCT02811835.
      Keywords: Research Need: Role of Nutrition in Health Maintenance, Research Need: Role of Nutrition in Medical Management
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.164012
      Issue No: Vol. 106, No. 6 (2017)
  • The effects of dietary protein intake on appendicular lean mass and muscle
           function in elderly men: a 10-wk randomized controlled trial [Nutritional
           status, dietary intake, and body composition]
    • Authors: Mitchell, C. J; Milan, A. M, Mitchell, S. M, Zeng, N, Ramzan, F, Sharma, P, Knowles, S. O, Roy, N. C, Sjödin, A, Wagner, K.-H, Cameron-Smith, D.
      Pages: 1375 - 1383
      Abstract: Background: The Recommended Daily Allowance (RDA) for protein intake in the adult population is widely promoted as 0.8 g · kg–1 · d–1. Aging may increase protein requirements, particularly to maintain muscle mass.Objective: We investigated whether controlled protein consumption at the current RDA or twice the RDA (2RDA) affects skeletal muscle mass and physical function in elderly men.Design: In this parallel-group randomized trial, 29 men aged>70 y [mean ± SD body mass index (in kg/m2): 28.3 ± 4.2] were provided with a complete diet containing either 0.8 (RDA) or 1.6 (2RDA) g protein · kg–1 · d–1, aimed to balance energy needs. Before treatment and after 10 wk of intervention, whole-body and appendicular lean mass were measured by using dual-energy X-ray absorptiometry. Knee-extension peak power was measured with dynamometry.Results: Both groups were found to have been in a moderate negative energy balance (mean ± SD RDA: 209 ± 213 kcal/d; 2RDA 145 ± 214 kcal/d; P = 0.427 for difference between the groups). In comparison with RDA, whole-body lean mass increased in 2RDA (P = 0.001; 1.49 ± 1.30 kg, P < 0.001 compared with –0.55 ± 1.49 kg, P = 0.149). This difference was mostly accounted for by an increase in trunk lean mass found in 2RDA (+1.39 ± 1.09 kg, P < 0.001). Appendicular lean mass also decreased in RDA compared with 2RDA (P = 0.022), driven by a reduction in RDA (–0.64 ± 0.91 kg, P = 0.005 compared with 0.11 ± 0.57 kg, P = 0.592). Adjusting for energy imbalances did not alter these findings. Knee-extension peak power was also differently affected (P = 0.012; 26.6 ± 47.7 W, P = 0.015 in 2RDA compared with –11.7 ± 31.0 W, P = 0.180 in RDA).Conclusions: Consumption of a diet providing 2RDA for protein compared with the current guidelines was found to have beneficial effects on lean body mass and leg power in elderly men. These effects were not explained by differences in energy balance. This trial was registered at the Australia New Zealand Clinical Trial Registry ( as ACTRN12616000310460.
      Keywords: Research Need: Role of Nutrition in Health Maintenance
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.160325
      Issue No: Vol. 106, No. 6 (2017)
  • Pomegranate juice, but not an extract, confers a lower glycemic response
           on a high-glycemic index food: randomized, crossover, controlled trials in
           healthy subjects [Carbohydrate metabolism and diabetes]
    • Authors: Kerimi, A; Nyambe-Silavwe, H, Gauer, J. S, Tomas-Barberan, F. A, Williamson, G.
      Pages: 1384 - 1393
      Abstract: Background: Low–glycemic index diets have demonstrated health benefits associated with a reduced risk of developing type 2 diabetes.Objectives: We tested whether pomegranate polyphenols could lower the glycemic response of a high–glycemic index food when consumed together and the mechanism by which this might occur.Design: We compared the acute effect of a pomegranate juice and a polyphenol-rich extract from pomegranate (supplement) on the bread-derived postprandial blood glucose concentration in 2 randomized, crossover, controlled studies (double-blinded for the supplements), each on 16 healthy volunteers. An additional randomized, crossover, controlled study on 16 volunteers consuming constituent fruit acids in a pH-balanced solution (same pH as pomegranate) and bread was conducted to determine any contributions to postprandial responses caused by acidic beverages.Results: As primary outcome, the incremental area under the curve for bread-derived blood glucose (–33.1% ± 18.1%, P = 0.000005) and peak blood glucose (25.4% ± 19.3%, P = 0.0004) were attenuated by pomegranate juice, compared with a control solution containing the equivalent amount of sugars. In contrast, the pomegranate supplement, or a solution containing the malic and citric acid components of the juice, was ineffective. The pomegranate polyphenol punicalagin was a very effective inhibitor of human α-amylase in vitro, comparable to the drug acarbose. Neither the pomegranate extract nor the individual component polyphenols inhibited 14C-D-glucose transport across differentiated Caco-2/TC7 cell monolayers, but they inhibited uptake of 14C-glucose into Xenopus oocytes expressing the human glucose transporter type 2. Further, some of the predicted pomegranate gut microbiota metabolites modulated 14C-D-glucose and 14C-deoxy-D-glucose uptake into hepatic HepG2 cells.Conclusions: These data indicate that pomegranate polyphenols, when present in a beverage but not in a supplement, can reduce the postprandial glycemic response of bread, whereas microbial metabolites from pomegranate polyphenols exhibit the potential to further modulate sugar metabolism much later in the postprandial period. This trial was registered at as NCT02486978, NCT02624609, and NCT03242876.
      Keywords: Dietary Bioactive Compounds Research Articles, Research Need: Role of Nutrition in Health Maintenance
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.161968
      Issue No: Vol. 106, No. 6 (2017)
  • A systematic review and meta-analysis of nutrition therapy compared with
           dietary advice in patients with type 2 diabetes [Carbohydrate metabolism
           and diabetes]
    • Authors: Moller, G; Andersen, H. K, Snorgaard, O.
      Pages: 1394 - 1400
      Abstract: Background: Despite recommendations, many patients with type 2 diabetes receive dietary advice from nurses or doctors instead of individualized nutrition therapy (INT) that is provided by a dietitian.Objective: We performed a meta-analysis to compare the effect of INT that is provided by a registered dietitian with the effect of dietary advice that is provided by other healthcare professionals.Design: A systematic review was conducted of Cochrane library databases, EMBASE, CINAHL, and MEDLINE in the period 2004–2017 for guidelines, reviews, and randomized controlled trials (RCTs) that assessed the outcomes glycated hemoglobin (HbA1c), weight, body mass index (BMI; in kg/m2), and LDL cholesterol. Risk of bias and the quality of evidence were assessed according to the Grading of Recommendations Assessment, Development and Evaluation guidelines.Results: We identified 5 RCTs comprising 912 participants in total. In the first year of intervention (at 6 or 12 mo), nutrition therapy compared with dietary advice was followed by a 0.45% (95% CI: 0.36%, 0.53%) lower mean difference in HbA1c, a 0.55 (95% CI: 0.02, 1.1) lower BMI, a 2.1-kg (95% CI: 1.2-, 2.9-kg) lower weight, and a 0.17-mmol/L (95% CI: 0.11-, 0.23-mmol/L) lower LDL cholesterol. No longer-term data were available. Some of the included studies had a potential bias, and therefore, the quality of the evidence was low or moderate. In addition, it was necessary to pool primary and secondary outcomes.Conclusions: INT that is provided by a dietitian compared with dietary advice that is provided by other health professionals leads to a greater effect on HbA1c, weight, and LDL cholesterol. Because of the potential bias, we recommend considering nutrition therapy that is provided by a dietitian as part of lifestyle intervention in type 2 diabetes, but further randomized studies are warranted.
      Keywords: Diabetes
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.116.139626
      Issue No: Vol. 106, No. 6 (2017)
  • Consumption of whole eggs promotes greater stimulation of postexercise
           muscle protein synthesis than consumption of isonitrogenous amounts of egg
           whites in young men [Energy and protein metabolism]
    • Authors: van Vliet, S; Shy, E. L, Abou Sawan, S, Beals, J. W, West, D. W, Skinner, S. K, Ulanov, A. V, Li, Z, Paluska, S. A, Parsons, C. M, Moore, D. R, Burd, N. A.
      Pages: 1401 - 1412
      Abstract: Background: Protein in the diet is commonly ingested from whole foods that contain various macro- and micronutrients. However, the effect of consuming protein within its natural whole-food matrix on postprandial protein metabolism remains understudied in humans.Objective: We aimed to compare the whole-body and muscle protein metabolic responses after the consumption of whole eggs with egg whites during exercise recovery in young men.Design: In crossover trials, 10 resistance-trained men [aged 21 ± 1 y; 88 ± 3 kg; body fat: 16% ± 1% (means ± SEMs)] received primed continuous l-[ring-2H5]phenylalanine and l-[1-13C]leucine infusions and performed a single bout of resistance exercise. After exercise, participants consumed intrinsically l-[5,5,5-2H3]leucine-labeled whole eggs (18 g protein, 17 g fat) or egg whites (18 g protein, 0 g fat). Repeated blood and muscle biopsy samples were collected to assess whole-body leucine kinetics, intramuscular signaling, and myofibrillar protein synthesis.Results: Plasma appearance rates of protein-derived leucine were more rapid after the consumption of egg whites than after whole eggs (P = 0.01). Total plasma availability of leucine over the 300-min postprandial period was similar (P = 0.75) between the ingestion of whole eggs (68% ± 1%) and egg whites (66% ± 2%), with no difference in whole-body net leucine balance (P = 0.27). Both whole-egg and egg white conditions increased the phosphorylation of mammalian target of rapamycin complex 1, ribosomal protein S6 kinase 1, and eukaryotic translation initiation factor 4E–binding protein 1 during postexercise recovery (all P < 0.05). However, whole-egg ingestion increased the postexercise myofibrillar protein synthetic response to a greater extent than did the ingestion of egg whites (P = 0.04).Conclusions: We show that the ingestion of whole eggs immediately after resistance exercise resulted in greater stimulation of myofibrillar protein synthesis than did the ingestion of egg whites, despite being matched for protein content in young men. Our data indicate that the ingestion of nutrient- and protein-dense foods differentially stimulates muscle anabolism compared with protein-dense foods. This trial was registered at as NCT03117127.
      Keywords: Research Need: Role of Nutrition in Health Maintenance
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.159855
      Issue No: Vol. 106, No. 6 (2017)
  • A 1-h time interval between a meal containing iron and consumption of tea
           attenuates the inhibitory effects on iron absorption: a controlled trial
           in a cohort of healthy UK women using a stable iron isotope [Vitamins,
           minerals, and phytochemicals]
    • Authors: Ahmad Fuzi, S. F; Koller, D, Bruggraber, S, Pereira, D. I, Dainty, J. R, Mushtaq, S.
      Pages: 1413 - 1421
      Abstract: Background: Tea has been shown to be a potent inhibitor of nonheme iron absorption, but it remains unclear whether the timing of tea consumption relative to a meal influences iron bioavailability.Objective: The aim of the study was to investigate the effect of a 1-h time interval of tea consumption on nonheme iron absorption in an iron-containing meal in a cohort of iron-replete, nonanemic female subjects with the use of a stable isotope (57Fe).Design: Twelve women (mean ± SD age: 24.8 ± 6.9 y) were administered a standardized porridge meal extrinsically labeled with 4 mg 57Fe as FeSO4 on 3 separate occasions, with a 14-d time interval between each test meal (TM). The TM was administered with water (TM-1), with tea administered simultaneously (TM-2), and with tea administered 1 h postmeal (TM-3). Fasted venous blood samples were collected for iron isotopic analysis and measurement of iron status biomarkers. Fractional iron absorption was estimated by the erythrocyte iron incorporation method.Results: Iron absorption was 5.7% ± 8.5% (TM-1), 3.6% ± 4.2% (TM-2), and 5.7% ± 5.4% (TM-3). Mean fractional iron absorption was found to be significantly higher (2.2%) when tea was administered 1 h postmeal (TM-3) than when tea was administered simultaneously with the meal (TM-2) (P = 0.046). An ~50% reduction in the inhibitory effect of tea (relative to water) was observed, from 37.2% (TM-2) to 18.1% (TM-3).Conclusions: This study shows that tea consumed simultaneously with an iron-containing porridge meal leads to decreased nonheme iron absorption and that a 1-h time interval between a meal and tea consumption attenuates the inhibitory effect, resulting in increased nonheme iron absorption. These findings are not only important in relation to the management of iron deficiency but should also inform dietary advice, especially that given to those at risk of deficiency. This trial was registered at as NCT02365103.
      Keywords: Research Need: Role of Nutrition in Health Maintenance, Research Need: Understanding Nutrition-related Behaviors
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.161364
      Issue No: Vol. 106, No. 6 (2017)
  • Bone mineral density during pregnancy in women participating in a
           randomized controlled trial of vitamin D supplementation [Vitamins,
           minerals, and phytochemicals]
    • Authors: Wei, W; Shary, J. R, Garrett-Mayer, E, Anderson, B, Forestieri, N. E, Hollis, B. W, Wagner, C. L.
      Pages: 1422 - 1430
      Abstract: Background: Little is known about bone mineral density (BMD) during pregnancy. Advances in technology with lower radiation emissions by dual-energy X-ray absorptiometry instruments now permit the safe measurement of BMD during pregnancy.Objective: We evaluated maternal BMD during pregnancy as a function of vitamin D status in women of diverse racial/ethnic backgrounds.Design: A total of 301 women who underwent BMD measurements at 12–20 wk of gestation and again at 0–14 wk postpartum were included in this analysis. Women were a subset of subjects who were recruited for a randomized, controlled, double-blind trial of vitamin D supplementation in pregnancy (400, 2000, or 4000 IU/d).Results: Treatment had no significant effect on changes in BMD that occurred between 12–20 wk of gestation and 0–14 wk postpartum. Similarly, changes in spine and femoral neck bone mineral contents (BMCs) were not significantly different in the treatment groups. In addition, vitamin D inadequacy (serum 25-hydroxyvitamin D concentration, averaged across pregnancy,
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.116.140459
      Issue No: Vol. 106, No. 6 (2017)
  • Effects of potassium supplements on glucose metabolism in African
           Americans with prediabetes: a pilot trial [Vitamins, minerals, and
    • Authors: Chatterjee, R; Slentz, C, Davenport, C. A, Johnson, J, Lin, P.-H, Muehlbauer, M, DAlessio, D, Svetkey, L. P, Edelman, D.
      Pages: 1431 - 1438
      Abstract: Background: Low potassium has been identified both as a risk factor for type 2 diabetes and as a mediator of the racial disparity in diabetes risk. Low potassium could be a potentially modifiable risk factor, particularly for African Americans.Objective: We sought to determine the effects of potassium chloride (KCl) supplements, at a commonly prescribed dose, on measures of potassium and glucose metabolism.Design: Among African-American adults with prediabetes, we conducted a double-blinded pilot randomized controlled trial that compared the effects of 40 mEq K/d as KCl supplements with a matching placebo, taken for 3 mo, on measures of potassium and glucose metabolism, with measures collected from frequently sampled oral-glucose-tolerance tests (OGTTs).Results: Twenty-seven of 29 recruited participants completed the trial. Participants had high adherence to the study medication (92% by pill count). Participants in both groups gained weight, with an overall mean ± SD weight gain of 1.24 ± 2.03 kg. In comparison with participants who received placebo, urine potassium but not serum potassium increased significantly among participants randomly assigned to receive KCl (P = 0.005 and 0.258, respectively). At the end of the study, participants taking KCl had stable or improved fasting glucose, with a mean ± SD change in fasting glucose of –1.1 ± 8.4 mg/dL compared with an increase of 6.1 ± 7.6 mg/dL in those who received placebo (P = 0.03 for comparison between arms). There were no significant differences in glucose or insulin measures during the OGTT between the 2 groups, but there was a trend for improved insulin sensitivity in potassium-treated participants.Conclusions: In this pilot trial, KCl at a dose of 40 mEq/d did not increase serum potassium significantly. However, despite weight gain, KCl prevented worsening of fasting glucose. Further studies in larger sample sizes, as well as with interventions to increase serum potassium more than was achieved with our intervention, are indicated to definitively test this potentially safe and inexpensive approach to reducing diabetes risk. This trial was registered at as NCT02236598.
      Keywords: Diabetes
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.161570
      Issue No: Vol. 106, No. 6 (2017)
  • Placental vitamin D metabolism and its associations with circulating
           vitamin D metabolites in pregnant women [Pregnancy and lactation]
    • Authors: Park, H; Wood, M. R, Malysheva, O. V, Jones, S, Mehta, S, Brannon, P. M, Caudill, M. A.
      Pages: 1439 - 1448
      Abstract: Background: Little is known about placental vitamin D metabolism and its impact on maternal circulating vitamin D concentrations in humans.Objective: This study sought to advance the current understanding of placental vitamin D metabolism and its role in modulating maternal circulating vitamin D metabolites during pregnancy.Design: Nested within a feeding study, 24 healthy pregnant women (26–29 wk of gestation) consumed a single amount of vitamin D (511 IU/d from diet and a cholecalciferol supplement) for 10 wk. Concentrations of placental and blood vitamin D metabolites and placental messenger RNA (mRNA) abundance of vitamin D metabolic pathway components were quantified. In addition, cultured human trophoblasts were incubated with 13C-cholecalciferol to examine the intracellular generation and secretion of vitamin D metabolites along with the regulation of target genes.Results: In placental tissue, 25-hydroxyvitamin D3 [25(OH)D3] was strongly correlated (r = 0.83, P < 0.001) with 24,25-dihydroxyvitamin D3. Moreover, these placental metabolites were strongly correlated (r ≤ 0.85, P ≤ 0.04) with their respective metabolites in maternal circulation. Positive associations (P ≤ 0.045) were also observed between placental mRNA abundance of vitamin D metabolic components and circulating vitamin D metabolites [i.e., LDL-related protein 2 (LRP2, also known as megalin) with 25(OH)D3 and the C3 epimer of 25(OH)D3 [3-epi-25(OH)D3]; cubilin (CUBN) with 25(OH)D3; 25-hydroxylase (CYP2R1) with 3-epi-25(OH)D3; 24-hydroxylase (CYP24A1) with 25(OH)D3, 3-epi-25(OH)D3, and 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]; and 1α-hydroxylase [(CYP27B1) with 3-epi-25(OH)D3 and 1,25(OH)2D3]. Notably, in vitro experiments with trophoblasts showed increased production and secretion of 25(OH)D3 and higher CYP24A1 gene transcript abundance in response to cholecalciferol treatment.Conclusions: The numerous associations of many of the placental biomarkers of vitamin D metabolism with circulating vitamin D metabolites among pregnant women [including a CYP27B1–associated increase in 1,25(OH)2D3] and the evidence of trophoblast production and secretion of vitamin D metabolites, especially 25(OH)D3, suggest that the placenta may play an active role in modulating the vitamin D metabolite profile in maternal circulation in human pregnancy. This trial was registered at as NCT03051867.
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.153429
      Issue No: Vol. 106, No. 6 (2017)
  • Maternal weight gain and associations with longitudinal fetal growth in
           dichorionic twin pregnancies: a prospective cohort study [Pregnancy and
    • Authors: Hinkle, S. N; Hediger, M. L, Kim, S, Albert, P. S, Grobman, W, Newman, R. B, Wing, D. A, Grewal, J, Zhang, C, Buck Louis, G. M, Grantz, K. L.
      Pages: 1449 - 1455
      Abstract: Background: Maternal metabolic demands are much greater with twin gestations; however, there are no accepted recommendations for maternal weight gain in twin pregnancies.Objective: We assessed the association of maternal weight gain and fetal growth in dichorionic twins throughout pregnancy.Design: This was a prospective US cohort study (n = 143, 2012–2013) of dichorionic twin pregnancies with known birth outcomes followed from enrollment (11–13 wk) and for ≤6 research visits throughout gestation. Maternal prepregnancy weight was self-reported, and current weight was measured at each research visit and abstracted from prenatal records. Fetal biometry was assessed by ultrasound at each research visit. Maternal weight and twin-pair fetal size trajectories across gestation were modeled. The adjusted associations between maternal weight gain from 0 to 13, 14 to 20, 21 to 27, and 28 to 34 wk and fetal growth at the subsequent week (i.e., 14, 21, 28, and 35 wk, respectively) were estimated with the use of linear regression.Results: The mean ± SD maternal weight gain from 0 to 13, 14 to 20, 21 to 27, and 28 to 34 wk was 2.8 ± 3.0 kg, 3.9 ± 1.2 kg, 3.8 ± 1.4 kg, and 4.4 ± 2.2 kg, respectively, with a total gain of 17.7 ± 7.4 kg. Maternal weight gain from 0 to 13 wk (first trimester) was not associated with fetal size at 14 wk. Maternal weight gain from 14 to 20 and 21 to 27 wk (second trimester) was significantly associated with increased fetal weight at 21 wk [increase of 10.5 g/kg maternal weight gain (95% CI: 1.2, 19.8 g)] and 28 wk [increase of 21.3 g/kg maternal weight gain (95% CI: 0.6, 42.0 g)]. Maternal weight gain from 14 to 20 wk was associated with increased twin abdominal circumference (AC) and biparietal diameter at 21 wk. Maternal weight gain from 21 to 27 wk was associated with increased femur and humerus lengths at 28 wk.Conclusion: Maternal weight gain was associated with dichorionic twin fetal growth in the second trimester only, driven by an association with AC earlier in second trimester and long bones later in the second trimester.
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.158873
      Issue No: Vol. 106, No. 6 (2017)
  • Breastfeeding and motor development in term and preterm infants in a
           longitudinal US cohort [Growth, development, and pediatrics]
    • Authors: Michels, K. A; Ghassabian, A, Mumford, S. L, Sundaram, R, Bell, E. M, Bello, S. C, Yeung, E. H.
      Pages: 1456 - 1462
      Abstract: Background: The relation between breastfeeding and early motor development is difficult to characterize because of the problems in existing studies such as incomplete control for confounding, retrospective assessment of infant feeding, and even the assessment of some motor skills too early.Objective: We sought to estimate associations between infant feeding and time to achieve major motor milestones in a US cohort.Design: The Upstate New York Infant Development Screening Program (Upstate KIDS Study) enrolled mothers who delivered live births in New York (2008–2010). Mothers of 4270 infants (boys: 51.7%) reported infant motor development at 4, 8, 12, 18, and 24 mo postpartum; information on infant feeding was reported at 4 mo. Accelerated failure time models were used to compare times to standing or walking across feeding categories while adjusting for parental characteristics, daycare, region, and infant plurality, sex, rapid weight gain, and baseline neurodevelopmental test results. Main models were stratified by preterm birth status.Results: The prevalence of exclusive breastfeeding in preterm infants was lower than in term infants at 4 mo postpartum (8% compared with 19%). After adjustment for confounders, term infants who were fed solids in addition to breast milk at 4 mo postpartum achieved both standing [acceleration factor (AF): 0.93; 95% CI: 0.87, 0.99] and walking (AF: 0.93; 95% CI: 0.88, 0.98) 7% faster than did infants who were exclusively breastfed, but these findings did not remain statistically significant after correction for multiple testing. We did not identify feeding-associated differences in motor milestone achievement in preterm infants.Conclusion: Our results suggest that differences in feeding likely do not translate into large changes in motor development. The Upstate KIDS Study was registered at as NCT03106493.
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.116.144279
      Issue No: Vol. 106, No. 6 (2017)
  • A high-glycemic diet is associated with cerebral amyloid burden in
           cognitively normal older adults [Aging]
    • Authors: Taylor, M. K; Sullivan, D. K, Swerdlow, R. H, Vidoni, E. D, Morris, J. K, Mahnken, J. D, Burns, J. M.
      Pages: 1463 - 1470
      Abstract: Background: Little is known about the relation between dietary intake and cerebral amyloid accumulation in aging.Objective: We assessed the association of dietary glycemic measures with cerebral amyloid burden and cognitive performance in cognitively normal older adults.Design: We performed cross-sectional analyses relating dietary glycemic measures [adherence to a high-glycemic-load diet (HGLDiet) pattern, intakes of sugar and carbohydrates, and glycemic load] with cerebral amyloid burden (measured by florbetapir F-18 positron emission tomography) and cognitive performance in 128 cognitively normal older adults who provided eligibility screening data for the University of Kansas’s Alzheimer’s Prevention through Exercise (APEX) Study. The study began in November 2013 and is currently ongoing.Results: Amyloid was elevated in 26% (n = 33) of participants. HGLDiet pattern adherence (P = 0.01), sugar intake (P = 0.03), and carbohydrate intake (P = 0.05) were significantly higher in participants with elevated amyloid burden. The HGLDiet pattern was positively associated with amyloid burden both globally and in all regions of interest independently of age, sex, and education (all P ≤ 0.001). Individual dietary glycemic measures (sugar intake, carbohydrate intake, and glycemic load) were also positively associated with global amyloid load and nearly all regions of interest independently of age, sex, and educational level (P ≤ 0.05). Cognitive performance was associated only with daily sugar intake, with higher sugar consumption associated with poorer global cognitive performance (global composite measure and Mini-Mental State Examination) and performance on subtests of Digit Symbol, Trail Making Test B, and Block Design, controlling for age, sex, and education.Conclusion: A high-glycemic diet was associated with greater cerebral amyloid burden, which suggests diet as a potential modifiable behavior for cerebral amyloid accumulation and subsequent Alzheimer disease risk. This trial was registered at as NCT02000583.
      Keywords: Research Need: Role of Nutrition in Health Maintenance
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.162263
      Issue No: Vol. 106, No. 6 (2017)
  • Comparison of global nutrient profiling systems for restricting the
           commercial marketing of foods and beverages of low nutritional quality to
           children in Canada [Nutritional epidemiology and public health]
    • Authors: Labonte, M.-E; Poon, T, Mulligan, C, Bernstein, J. T, Franco-Arellano, B, LAbbe, M. R.
      Pages: 1471 - 1481
      Abstract: Background: The Canadian government recently committed to introduce legislation to restrict the commercial marketing of unhealthy foods and beverages to children.Objective: We compared the degree of strictness and agreement between nutrient profile (NP) models relevant to marketing restrictions by applying them in the Canadian context.Design: With the use of data from the University of Toronto 2013 Food Label Information Program (n = 15,342 prepackaged foods), 4 NP models were evaluated: the Food Standards Australia New Zealand-Nutrient Profiling Scoring Criterion (FSANZ-NPSC), the WHO Regional Office for Europe (EURO) model, the Pan American Health Organization (PAHO) model, and a modified version of the PAHO model (Modified-PAHO), which did not consider the extent of food processing because the application of this characteristic was prone to ambiguity. The number and proportion of foods that would be eligible for marketing to children was calculated with the use of each model, overall and by food category.Results: The Modified-PAHO and PAHO models would permit only 9.8% (95% CI: 9.4%, 10.3%) and 15.8% (95% CI: 15.3%, 16.4%) of foods, respectively, followed by the EURO model [29.8% (95% CI: 29.0%, 30.5%)]. In contrast, the FSANZ-NPSC would consider almost half of prepackaged foods as eligible for marketing to children [49.0% (95% CI: 48.2%, 49.8%)]. Cross-classification analyses showed that only 8.1% of foods would be eligible based on all models (e.g., most pastas without sauce). Subanalyses showed that each model would be more stringent when evaluating food items that specifically target children on their package (n = 747; from 1.9% of foods eligible under Modified-PAHO to 24.2% under FSANZ-NPSC).Conclusions: The degree of strictness and agreement vary greatly between NP models applicable to marketing restrictions. The discrepancies between models highlight the importance for policy makers to carefully evaluate the characteristics underlying such models when trying to identify a suitable model to underpin regulations restricting the marketing of unhealthy foods to children.
      Keywords: Research Need: How the Food Environment and Supply Affects Dietary and Lifestyle Choices
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.161356
      Issue No: Vol. 106, No. 6 (2017)
  • Eggs early in complementary feeding increase choline pathway biomarkers
           and DHA: a randomized controlled trial in Ecuador [International
    • Authors: Iannotti, L. L; Lutter, C. K, Waters, W. F, Gallegos Riofrio, C. A, Malo, C, Reinhart, G, Palacios, A, Karp, C, Chapnick, M, Cox, K, Aguirre, S, Narvaez, L, Lopez, F, Sidhu, R, Kell, P, Jiang, X, Fujiwara, H, Ory, D. S, Young, R, Stewart, C. P.
      Pages: 1482 - 1489
      Abstract: Background: Choline status has been associated with stunting among young children. Findings from this study showed that an egg intervention improved linear growth by a length-for-age z score of 0.63.Objective: We aimed to test the efficacy of eggs introduced early in complementary feeding on plasma concentrations of biomarkers in choline pathways, vitamins B-12 and A, and essential fatty acids.Design: A randomized controlled trial, the Lulun ("egg" in Kichwa) Project, was conducted in a rural indigenous population of Ecuador. Infants aged 6–9 mo were randomly assigned to treatment (1 egg/d for 6 mo; n = 80) and control (no intervention; n = 83) groups. Socioeconomic data, anthropometric measures, and blood samples were collected at baseline and endline. Household visits were made weekly for morbidity surveillance. We tested vitamin B-12 plasma concentrations by using chemiluminescent competitive immunoassay and plasma concentrations of choline, betaine, dimethylglycine, retinol, essential fatty acids, methionine, dimethylamine (DMA), trimethylamine, and trimethylamine-N-oxide (TMAO) with the use of liquid chromatography–tandem mass spectrometry.Results: Socioeconomic factors and biomarker concentrations were comparable at baseline. Of infants, 11.4% were vitamin B-12 deficient and 31.7% marginally deficient at baseline. In adjusted generalized linear regression modeling, the egg intervention increased plasma concentrations compared with control by the following effect sizes: choline, 0.35 (95% CI: 0.12, 0.57); betaine, 0.29 (95% CI: 0.01, 0.58); methionine, 0.31 (95% CI: 0.03, 0.60); docosahexaenoic acid, 0.43 (95% CI: 0.13, 0.73); DMA, 0.37 (95% CI: 0.37, 0.69); and TMAO, 0.33 (95% CI: 0.08, 0.58). No significant group differences were found for vitamin B-12, retinol, linoleic acid (LA), α-linolenic acid (ALA), or ratios of betaine to choline and LA to ALA.Conclusion: The findings supported our hypothesis that early introduction of eggs significantly improved choline and other markers in its methyl group metabolism pathway. This trial was registered at as NCT02446873.
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.160515
      Issue No: Vol. 106, No. 6 (2017)
  • Low serum {omega}-3 and {omega}-6 polyunsaturated fatty acids and other
           metabolites are associated with poor linear growth in young children from
           rural Malawi [International nutrition]
    • Authors: Semba, R. D; Trehan, I, Li, X, Salem, N, Moaddel, R, Ordiz, M. I, Maleta, K. M, Kraemer, K, Manary, M. J.
      Pages: 1490 - 1499
      Abstract: Background: Stunting affects ~25% of children
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.164384
      Issue No: Vol. 106, No. 6 (2017)
  • Complementary feeding with cowpea reduces growth faltering in rural
           Malawian infants: a blind, randomized controlled clinical trial
           [International nutrition]
    • Authors: Stephenson, K. B; Agapova, S. E, Divala, O, Kaimila, Y, Maleta, K. M, Thakwalakwa, C, Ordiz, M. I, Trehan, I, Manary, M. J.
      Pages: 1500 - 1507
      Abstract: Background: Growth faltering is common in rural African children and is attributed to inadequate dietary intake and environmental enteric dysfunction (EED).Objective: We tested the hypothesis that complementary feeding with cowpea or common bean flour would reduce growth faltering and EED in 6-mo-old rural Malawians compared with the control group receiving a corn-soy blend.Design: A prospective, double-blind, randomized controlled clinical trial was conducted in which children received daily feeding for 6 mo (200 kcal/d when 6–9 mo old and 300 kcal/d when 10–12 mo old). The primary outcomes were change in length-for-age z score (LAZ) and improvements in EED, as measured by percentage of lactulose excretion (%L). %L
      Keywords: Research Need: Impact of Nutrition on Healthy Growth, Development, and Reproduction
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.117.160986
      Issue No: Vol. 106, No. 6 (2017)
  • The SLC2A14 gene, encoding the novel glucose/dehydroascorbate transporter
           GLUT14, is associated with inflammatory bowel disease [Gene-nutrient
    • Authors: Amir Shaghaghi, M; Zhouyao, H, Tu, H, El-Gabalawy, H, Crow, G. H, Levine, M, Bernstein, C. N, Eck, P.
      Pages: 1508 - 1513
      Abstract: Background: Variations in intestinal antioxidant membrane transporters are implicated in the initiation and progression of inflammatory bowel disease (IBD). Facilitated glucose transporter member 14 (GLUT14), encoded by the solute carrier family 2 member 14 (SLC2A14) gene, is a putative transporter for dehydroascorbic acid and glucose. Although information on the gene is limited, shorter and longer GLUT14 isoforms have been identified. We hypothesized that GLUT14 mediates glucose and dehydroascorbic acid uptake. If this function could be validated, then genetic variations may associate with IBD.Objective: This study aimed to determine the substrate(s) for the GLUT14 protein and interrogated genetic associations of SLC2A14 with IBD.Design: The uptake of radiolabeled substrates into Xenopus laevis oocytes expressing the 2 GLUT14 isoforms was assessed. Examination of gene-targeted genetic association in the Manitoba Inflammatory Bowel Disease Cohort Study was conducted through the genotyping of single nucleotide polymorphisms (SNPs) representing linkage blocks of the SLC2A14 gene.Results: Both GLUT14 isoforms mediated the uptake of dehydroascorbic acid and glucose into X. laevis oocytes. Three alleles in the SLC2A14 gene associated independently with IBD. The odds of having ulcerative colitis (UC) or Crohn disease (CD) were elevated in carriers of the SLC2A14 SNP rs2889504-T allele (OR: 3.60; 95% CI: 1.95, 6.64 and OR: 4.68; 95% CI: 2.78, 8.50, respectively). Similarly, the SNP rs10846086-G allele was associated with an increased risk of both UC and CD (OR: 2.91; 95% CI: 1.49, 5.68 and OR: 3.00; 95% CI: 1.55, 5.78, respectively). Moreover, the SNP rs12815313-T allele associated with increased susceptibility to CD and UC (OR: 2.12; 95% CI: 1.33, 3.36 and OR: 1.61; 95% CI: 1.01, 2.57, respectively).Conclusion: These findings strengthen the hypothesis that genetically determined local dysregulation of dietary vitamin C or antioxidants transport contributes to IBD development. These transporter proteins are targetable by dietary interventions, opening the avenue to a precision intervention for patients of specific genotypes with IBD. This trial was registered at as NCT03262649.
      PubDate: 2017-12-01T09:30:30-08:00
      DOI: 10.3945/ajcn.116.147603
      Issue No: Vol. 106, No. 6 (2017)
  • Effects of isolated soluble fiber supplementation on body weight,
           glycemia, and insulinemia in adults with overweight and obesity: a
           systematic review and meta-analysis of randomized controlled trials
           [Dietary supplements]
    • Authors: Thompson, S. V; Hannon, B. A, An, R, Holscher, H. D.
      Pages: 1514 - 1528
      Abstract: Background: There is strong epidemiologic evidence that dietary fiber intake is protective against overweight and obesity; however, results of intervention studies have been mixed. Soluble fiber beneficially affects metabolism, and fiber supplementation may be a feasible approach to improve body composition and glycemia in adults with overweight and obesity.Objective: We evaluated randomized controlled trials (RCTs) of isolated soluble fiber supplementation in overweight and obese adults on outcomes related to weight management [body mass index (BMI; in kg/m2), body weight, percentage of body fat, and waist circumference] and glucose and insulin metabolism (homeostasis model assessment of insulin resistance and fasting insulin) through a systematic review and meta-analysis.Design: We searched PubMed, Web of Science, Cumulative Index to Nursing and Allied Health Literature and Cochrane Library databases. Eligible studies were RCTs that compared isolated soluble fiber with placebo treatments without energy-restriction protocols. Random-effects models were used to estimate pooled effect sizes and 95% CIs. Meta-regressions were performed to assess outcomes in relation to the intervention duration, fiber dose, and fiber type. Publication bias was assessed via Begg’s and Egger’s tests and funnel plot inspection.Results: Findings from 12 RCTs (n = 609 participants) from 2 to 17 wk of duration are summarized in this review. Soluble fiber supplementation reduced BMI by 0.84 (95% CI: –1.35, –0.32; P = 0.001), body weight by 2.52 kg (95% CI: –4.25, –0.79 kg; P = 0.004), body fat by 0.41% (95% CI: –0.58%, –0.24%; P < 0.001), fasting glucose by 0.17 mmol/L (95% CI: –0.28, –0.06 mmol/L; P = 0.002), and fasting insulin by 15.88 pmol/L (95% CI: –29.05, –2.71 pmol/L; P = 0.02) compared with the effects of placebo treatments. No publication bias was identified. Considerable between-study heterogeneity was observed for most outcomes.Conclusions: Isolated soluble fiber supplementation improves anthropometric and metabolic outcomes in overweight and obese adults, thereby indicating that supplementation may improve fiber intake and health in these individuals. However, the interpretation of these findings warrants caution because of the considerable between-study heterogeneity. This trial was registered at as NCT03003897.
      Keywords: Obesity and Metabolism Research Articles, Diabetes, Research Need: Role of Nutrition in Health Maintenance, Research Need: Role of Nutrition in Medical Management
      PubDate: 2017-12-01T09:30:31-08:00
      DOI: 10.3945/ajcn.117.163246
      Issue No: Vol. 106, No. 6 (2017)
  • Efficacy of iron supplementation may be misinterpreted using conventional
           measures of iron status in iron-depleted, nonanemic women undergoing
           aerobic exercise training [Dietary supplements]
    • Authors: Pompano, L. M; Haas, J. D.
      Pages: 1529 - 1538
      Abstract: Background: Despite its known detrimental effects, iron deficiency remains the most common micronutrient deficiency in the world. Many interventions that aim to improve iron status involve physically active populations. Intense aerobic exercise training negatively affects iron status; however, the impact of regular moderate aerobic exercise on the effectiveness of iron supplementation remains unclear.Objective: This study aimed to determine whether aerobic training modifies the assessment of the effectiveness of iron supplementation in improving conventional iron status measures.Design: Seventy-two iron-depleted, nonanemic Chinese women [serum ferritin (sFer) 110 g/L] were included in an 8-wk, partially blinded, randomized controlled trial with a 2 x 2 factorial design including iron supplements (42 mg elemental Fe/d) or placebo and aerobic training (five 25-min sessions/wk at 75–85% of maximum heart rate) or no training. Linear mixed models were used to evaluate the relation between supplement type, training, and changes in iron status over time, measured by sFer, hemoglobin, soluble transferrin receptor (sTfR), and estimated total body iron.Results: After treatment, both the iron-supplemented trained and untrained groups showed significantly improved sFer, sTfR, and body iron values compared with either of the placebo groups. Similarly, trained participants had significantly higher aerobic fitness measures than untrained participants. Training modified the sFer response to supplementation (training by supplement interaction, P = 0.07), with the iron-supplemented trained group having significantly lower sFer than the iron-supplemented untrained group at week 8 (mean ± SD: 31.8 ± 13.5 and 47.6 ± 15.7 μg/L, respectively; P = 0.042), whereas there was no significant difference between the placebo trained and untrained groups (21.3 ± 12.2 and 20.3 ± 7.0 μg/L, respectively; P = 1.00).Conclusions: Regular aerobic training reduces the apparent effectiveness of iron supplementation in improving sFer and calls into question whether conventional measures of iron status accurately reflect iron metabolism in physically active, nonanemic women. This trial was registered at as NCT03002090.
      Keywords: Research Need: Role of Nutrition in Health Maintenance
      PubDate: 2017-12-01T09:30:31-08:00
      DOI: 10.3945/ajcn.117.152777
      Issue No: Vol. 106, No. 6 (2017)
  • Erratum for Zyba et al. A moderate increase in dietary zinc reduces DNA
           strand breaks in leukocytes and alters plasma proteins without changing
           plasma zinc concentrations. Am J Clin Nutr 2017;105:343-51. [Errata]
    • Pages: 1539 - 1539
      PubDate: 2017-12-01T09:30:31-08:00
      DOI: 10.3945/ajcn.117.168567
      Issue No: Vol. 106, No. 6 (2017)
  • Calendar of Events [From the American Society for Nutrition]
    • Pages: 1540 - 1540
      PubDate: 2017-12-01T09:30:31-08:00
      Issue No: Vol. 106, No. 6 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
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