There is no standard answer to the question of how many calories a day will not be fat, generally between 1200-2400 kcal, affected by factors such as gender, weight and physical activity. 1. Gender: the daily intake of calories for men and women is different, a normal adult man needs 2200-2400 kilocalories per day, a normal woman needs 1900-2100 kilocalories per day. Consuming more calories than that range may cause body fat. 2. Body weight: Body weight also determines the difference in calories needed per day. People weighing 45KG and 55KG do not need the same amount of calories per day, and the lower the body weight, the fewer calories are needed per day. 3. Physical activity: Physical activity also determines the daily calorie requirement, the calorie requirement is different when there is exercise and no exercise, in the case of no exercise, the daily intake of 1500 kcal for a 60kg woman can basically maintain the normal physiological function. It is suggested that according to their own situation to determine the daily intake of dietary calories, in the intake of calories is more, must be more exercise to avoid getting fat.