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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.
For a person with stable weight to lose 100 pounds in six months, that person would have to cut 1,945 calories per day. One pound is equivalent to 3,500 calories, so 100 pounds equals 350,000 calories, divided by 180 days provides the result of a 1,945 calorie deficit needed daily.