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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.
There are 3,500 calories in a pound so use that number to determine how many pounds you can lose. For example, if you normally burn 2,000 calories per day and you consume 1,500 calories then you will lose 1 pound per week since you created a 500 calorie deficit per day (500 x 7 days = 3,500).