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According to new research published in the Journal of Science and Medicine in Sport says that if you are not losing weight even after a rigorous workout could be a sign that you're cheating yourself and not eating the right food for the calorie burn.
For the study, 10 "recreationally active" college-age women (so, not athletes) of normal body weight were given a high-protein meal (45 percent protein), low-protein meal (15 percent), or no food at all before walking on a treadmill. The women who ate the high-protein meal an hour prior to working out burned more calories per minute than the women who ate nothing. (No difference was found between the low-protein group and the fasting women.) The additional calorie burn amounted to 185 calories over the following 24-hour period.
"The body will use more calories when you have additional calories to expend (i.e., after eating)," says lead study author Ashley Binns, a Ph.D. student. Assuming you ate the same amount of total daily calories, the additional calorie burn could add up to a 15-pound weight loss over the course of a year. Although fasting before exercise has previously been used as a method for weight loss, the body breaks down muscle and/or fat as fuel sources if you don’t eat food prior to exercising, says Binns. "This could potentially result in muscle weight loss." And less muscle ultimately means less calorie burn.
Plan to eat a high-protein snack an hour before your workout to burn more calories during exercise. The exact amount of protein you should consume is still up for debate, though, says Binns. "Many studies suggest consumption of upward of 30 grams of protein spread throughout the day across three meals is ideal for maintenance of weight and/or weight loss." Good high-protein foods include protein drinks, egg whites, peanut butter, sprouts or yogurt.
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