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 food in half, they can reduce nearly 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 the daily calorie intake of food during dieting and weight loss should not be less than 1000 calories. 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, leading to cardiovascular diseases and even death in severe cases. 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. Dieting is actually not eating, which is harmful and useless. Long-term dieting will cause gastric motility disorder, which will lead to a series of symptoms such as abdominal distension and stomachache. More serious is anorexia. Anorexia means not eating anything, no matter what it is, you don't want to eat it. I feel nauseous at the sight. If you force yourself to eat, you will feel uncomfortable and then spit it out! ! Therefore, dieting is unscientific and harmful to people's health!