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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.
Therefore, you have to burn 3,500 calories more than you take in to lose one pound. For example, if you cut 500 calories from your diet every day, you would lose about one pound a week. Or, if you are physically active, you can eat 250 calories less every day and burn 250 calories per day with your workout.