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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.
Controlling the amount of calories you burn, in addition to other benefits, can help you control your weight. On average, you need to burn about 3,500 extra calories to shed one extra pound (0.45 kg).