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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.
Many sources out there say you'll need to burn approximately 3,500 calories to lose a pound. The number of calories burned will be dependent upon your body weight and type of physical activity you engage in. Of course, if you eat 3,500 calories afterward, you'll be about even.