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science nutrition blog

 The body uses mainly carbohydrates as fuels above exercise intensities of 65 percent of maximum effort. Fat and carbohydrate use following exercise varies with fuel availability and exercise intensity.

 A study from the National Taichung University in Taiwan found that the glycemic index of a meal consumed before exercise altered gene activity associated with the use of carbohydrates and fats. High-glycemic index meals (high in simple sugars) increased blood sugar and insulin after exercise, compared to low-glycemic index meals (higher in complex carbohydrates, fats, and proteins). Gene activity associated with fat metabolism decreased, following a high-glycemic index meal and increased following a meal higher in fat. The study showed that the glycemic index of a meal influences fat metabolism. (European Journal Clinical Nutrition, 63: 1404-1410, 2009)