In order to maintain your current weight, you must consume 30 to 35 calories per kilogram of body weight every day. A person weighing 50 kg will maintain his weight by eating 1500 to 2000 calories a day. If you eat 250 calories a day for a month, you will gain one kilogram. On the contrary, if you eat less than 250 calories a day for one month, you can lose one kilogram; If you eat less 1000 calories every day for a week, you can lose one kilogram. That is, you can change one kilogram of meat for every 7 thousand calories.

Scholars who study obesity believe that the safest speed to lose weight is to lose no more than one kilogram per week. If obese people cut their food by half, they can reduce about 1000 calories a day and one kilogram a week. But if you don't eat much, you can't just reduce the calories of 1000 calories, and you can't eat less than 1000 calories every day during dieting and weight loss.

Physiologically, the human body needs at least 1000 calories of food every day to operate safely and effectively. Otherwise, the protein of myocardial and vascular smooth muscle will be gradually lost, which will lead to cardiovascular diseases and even death. It is often reported abroad that people die because the total calorie intake is less than 500 calories per day. In addition, if the food calories below 1000 calories per day are maintained for a long time, human cells will become cancer cells due to long-term malnutrition, leading to the unfortunate end of cancer decades later, which most people did not expect. Chronic malnutrition is one of the main causes of cancer.