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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.
How many calories do you need to burn to lose one pound? According to the Mayo Clinic, 1 pound of fat is equal to about 3,500 calories, meaning that an individual must burn 3,500 more calories than he consumes in order to lose this amount of weight. When losing weight, water and lean tissue mass can be lost in addition to fat.