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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.
A pound of fat is rated around 3500 calories, you'd have to make that much of a deficit in your diet over the period of time you'd prefer in order to lose a pound. If you typically burn 2000 calories a day (for discussion), it'd take a week to drop a pound with a 1500 calorie diet.