Q…I have heard that in order to burn fat you must exercise moderately for at least 40 minutes, and that vigorous exercise burns sugar but not fat. Does that mean I should avoid high-intensity workouts if I want to lose weight?
A…Not necessarily. It’s true that the body burns more fat than sugar during prolonged, easy-to-moderate exercise, but uses mainly sugar during hard exercise. However, researchers have not determined whether physiological difference in fuel consumption translates into any meaningful difference in the amount of fat you would lose. What they do know is that you’ll shed both fat and pounds if you consistently burn more calories than you take in from food. And the average person can do moderate exercise, such as brisk walking, for much longer time than a vigorous one like running-and therefore burn significantly more calories overall. However, harder exercise can help you shed pounds if you use a special technique called interval training, in which you weave short bursts of vigorous exercise into a season of easier activity. Because the bursts generally don’t cause much fatigue, you should still be able to exercise for a long time, and thus burn even more calories than if you stuck with a moderate pace only.
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