Green Tea and Weight Loss, One pound of fat (0.45 kg) corresponds to about 3400 calories. Whether to lose with weightlossprograms or some other method to make a pound of fat over a period of one week, a person must maintain a calorie deficit of 3500 normal under their "set point" that "set point" will be the amount of calories in food, where a person loses nor gains fat is consumed. The calorie deficit can be caused by the change of diet, through exercise, or by a combination of both. In the case of one pound per week weight loss that works, to be necessary calorie deficit of 500 calories per day.