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Report Abuse. You have to eat 3500 calories less than the body requires to loose a pound. If you take your weight (say 200 lbs.) times 15 = 3000 cal. Therefore you would take the 3000 calories times 7 days which would = 21,000 calories. For every 3500 calories you eat less in one week represents 1 lb.
That's easy, just be alive! Your body is constantly burning calories to keep your body functioning. To burn more calories, do more activities, and the more strenuous the activity the greater the calorie burn. How many calories to lose one pound? You have to burn 3500 calories to lose one pound of weight.