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Original Research Communications |
1 From the Pennington Biomedical Research Center, Baton Rouge, LA.
Background: Dietary fat contents are highly variable. Failure to compensate for the positive fat balance that occurs during the shift to a high-fat, low-carbohydrate diet by increasing energy expenditure or by decreasing food intake may result in the gain of fat mass.
Objective: The objective of this study was to investigate the time course of fat oxidation during adaptation to an isoenergetic high-fat, low-carbohydrate diet.
Design: After a 5-d control diet, dietary fat was increased from 37% of energy to 50% of energy for 4 d in 6 healthy, young lean men. Respiratory quotient and substrate macronutrient oxidation and balance were measured in a respiratory chamber. Fasting concentrations of insulin, glucose, and triacylglycerol; maximal oxygen consumption (
O2max) during treadmill exercise; and free-living energy expenditure were determined. Body fat was measured by dual-energy X-ray absorptiometry and visceral adipose tissue by computerized tomography.
Results: Compared with the baseline diet, the high-fat, low-carbohydrate diet resulted in positive fat and protein balances and a negative carbohydrate balance. Insulin concentration and the postabsorptive respiratory quotient were positively correlated with the fat balance during the high-fat, low-carbohydrate diet, whereas
O2max during treadmill exercise was negatively related to fat balance. With use of stepwise regression,
O2max was the best predictor of fat balance. There was a negative correlation between fat balance and carbohydrate balance (r2 = 0.88).
Conclusion: Both baseline insulin concentration and
O2max during treadmill exercise predict fat balance during the shift to a high-fat diet under isoenergetic conditions.
Key Words: Respiratory chamber physical fitness insulin macronutrient oxidation dietary fat fat oxidation physical activity macronutrient oxidation fat balance high-fat diet obesity men
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