At lower intensities, you burn a greater percentage of calories from fat than carbohydrates, and at higher intensities you burn a greater percentage of calories from carbohydrates. High intensity aerobic exercise can use as much as 65% of the body's energy needs in the form of carbohydrate. The most important issue for fat loss is not the ratio of fat to carbohydrate burned, but the total number of calories burned and high intensity aerobic exercise burns the most calories!
The lower the intensity, the lower the total number of calories burned and the higher the intensity, the greater the number of calories burned. High intensity cardio also raises your metabolic rate after the workout to a much greater degree than low intensity cardio. That's why high intensity cardio is better, provided that you can maintain it for a long enough duration to burn an appreciable number of calories.
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A time for giving and receiving, getting closer with the ones we love and marking the end of another year and all the eating also. We eat because the food is yummy and plentiful but we don't usually count calories at this time of year. This book will help you do just this.