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Acute effects of dietary glycemic index on antioxidant capacity in a nutrient-controlled feeding study.

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Acute effects of dietary glycemic index on antioxidant capacity in a nutrient-controlled feeding study.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Botero, Diego Ebbeling, Cara B. Blumberg, Jeffrey B. Ribaya-Mercado, Judy D. Creager, Mark A. Swain, Janis F. Feldman, Henry A. Ludwig, David S.
Description	Country affiliation: United States Author Affiliation: Botero D ( Department of Medicine, Children's Hospital Boston, Boston, Massachusetts, USA.)
Abstract	Oxidative stress, caused by an imbalance between antioxidant capacity and reactive oxygen species, may be an early event in a metabolic cascade elicited by a high glycemic index (GI) diet, ultimately increasing the risk for cardiovascular disease and diabetes. We conducted a feeding study to evaluate the acute effects of low-GI compared with high-GI diets on oxidative stress and cardiovascular disease risk factors. The crossover study comprised two 10-day in-patient admissions to a clinical research center. For the admissions, 12 overweight or obese (BMI: 27-45 kg/m(2)) male subjects aged 18-35 years consumed low-GI or high-GI diets controlled for potentially confounding nutrients. On day 7, after an overnight fast and then during a 5-h postprandial period, we assessed total antioxidant capacity (total and perchloric acid (PCA) protein-precipitated plasma oxygen radical absorbance capacity (ORAC) assay) and oxidative stress status (urinary F(2alpha)-isoprostanes (F(2)IP)). On day 10, we measured cardiovascular disease risk factors. Under fasting conditions, total antioxidant capacity was significantly higher during the low-GI vs. high-GI diet based on total ORAC (11,736 +/- 668 vs. 10,381 +/- 612 micromol Trolox equivalents/l, P = 0.002) and PCA-ORAC (1,276 +/- 96 vs. 1,210 +/- 96 micromol Trolox equivalents/l, P = 0.02). Area under the postprandial response curve also differed significantly between the two diets for total ORAC and PCA-ORAC. No diet effects were observed for the other variables. Enhancement in plasma total antioxidant capacity occurs within 1 week on a low-GI diet, before changes in other risk factors, raising the possibility that this phenomenon may mediate, at least in part, the previously reported effects of GI on health.
File Format	HTM / HTML
ISSN	19307381
e-ISSN	1930739X
DOI	10.1038/oby.2009.203
Journal	Obesity
Issue Number	9
Volume Number	17
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2009-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Endocrinology Antioxidants Metabolism Blood Glucose Diet, Carbohydrate-restricted Dietary Carbohydrates Adverse Effects Glycemic Index Hyperglycemia Blood Obesity Diet Therapy Oxidative Stress Adolescent Biological Markers Urine Cardiovascular Diseases Etiology Cross-over Studies Energy Intake F2-isoprostanes Fasting Insulin Complications Postprandial Period Time Factors Randomized Controlled Trial Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Endocrinology, Diabetes and Metabolism Endocrinology

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