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Effects of dietary carbohydrate content on circulating metabolic fuel availability in the postprandial state | Journal of the Endocrine Society | Oxford Academic

In short, low carb gives you more energy to use. High carb stores that energy as fat instead. 


How might a high-carb diet drive fat storage, increase hunger and slow metabolism?

Our new study assessed calories in the blood available to fuel metabolism after eating.

Following an initial surge, calories crashed on a high-carb diet.

Intervention

After achieving 10% to 14% weight loss on a run-in diet, participants were randomized to weight-loss-maintenance test diets varying in carbohydrate content (high-carbohydrate, 60% of total energy, n = 11; moderate-carbohydrate, 40%, n = 8; low-carbohydrate, 20%, n = 10) and controlled for protein (20%). During 24-hour metabolic ward admissions between 10 and 15 weeks on the test diets, metabolic fuels and hormones were measured.

Main Outcome Measure

Energy availability (EA) based on energy content of blood glucose, beta-hydroxybutyrate, and free fatty acids, in the late postprandial period (180 to 300 minutes). Insulin at 30 minutes into the test meal (Meal Insulin-30) was measured as an effect modifier.

Results

Insulin-to-glucagon ratio was 7-fold higher in participants on the high- vs low-carbohydrate diet (2.5 and 0.36, respectively). Late postprandial EA was 0.58 kcal/L lower on the high- vs low-carbohydrate diet (P < 0.0001), primarily related to suppression of free fatty acids. Early postprandial EA (30 to 180 minutes) declined fastest in the high-carbohydrate group, and Meal Insulin-30 modified this diet effect.


Effects of dietary carbohydrate content on circulating metabolic fuel availability in the postprandial state | Journal of the Endocrine Society | Oxford Academic

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