Enhanced vascular function after acute fat-rich snacking in healthy males
| Autor: | Alyce D. Fly, Yibin Liu, David L. Daleke |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male medicine.medical_specialty Endocrinology Diabetes and Metabolism Hyperemia medicine.disease_cause Antioxidants Young Adult Endocrinology Reference Values Internal medicine medicine Body Size Humans Reactive hyperemia Cross-Over Studies Nutrition and Dietetics Snacking Chemistry digestive oral and skin physiology Hypertriglyceridemia food and beverages Fasting Postprandial Period medicine.disease Dietary Fats Crossover study Diet Surgery Oxidative Stress Postprandial Endothelium Vascular Analysis of variance Snacks Energy Intake human activities Body mass index Oxidative stress |
| Zdroj: | Nutrition Research. 32:565-572 |
| ISSN: | 0271-5317 |
| DOI: | 10.1016/j.nutres.2012.06.011 |
| Popis: | Diets high in fat are associated with vascular dysfunction. Frequent snacking may exacerbate this problem by extending the postprandial state. We hypothesized that repeated fat-rich mixed snacks would impair peripheral endothelial function and increase oxidative stress, a purported causal factor. Second, we hypothesized that feeding a quantity of snack based on the subject's body size would not cause different effects from feeding a fixed or constant size snack. A crossover design was used where 10 healthy males followed 2 repeated-snack regimens (fixed and variable based on body surface area), 1 week apart. Each regimen consisted of 2 snacks, fed 4 hours apart (0 and 4 hours). Markers of vascular function (reactive hyperemia index [RHI]), oxidative stress, and antioxidant capacity were measured before and after each snack. Peripheral vascular function improved from fasting to 2 hours after snack 1 (RHI(2h-0h), P = .010), but the change before and after snack 2, RHI(6h-4h), was negative (P = .026), indicating reduced endothelial function after repeated snacking. The oxidative stress marker changed over time (P = .043), increasing after snack 1 and decreasing before snack 2, with no change after snack 2. The antioxidant marker increased 2 hours after each snack (P = .003). Responses to fixed snacks over time were not different from variable snacks, although power was low; the effect size was large for antioxidant capacity, medium for oxidative stress, and small for RHI. Snacking after fasting resulted in a transiently improved peripheral vascular response that disappeared with a second snack. Antioxidant capacity appeared to help limit oxidative stress from repeated snacking in these healthy male subjects. |
| Databáze: | OpenAIRE |
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