How much weight can be lost in three days without eating can not give an exact value, because everyone’s physique is different, the speed of weight loss varies from person to person, and also according to the food each person eats in the three days, such as fruit, snacks and water consumption and decided. If you do not eat for three days, meaning that you do not eat staple foods for three days, and other foods are eaten as usual, you may not lose weight significantly, because other foods can also provide enough calories for the body. If you fast completely for three days and drink only water, you may lose weight more significantly, about 1-3kg, but most of the weight lost is water and intestinal contents in the body, the real consumption is not fat, and the weight will be regained sooner after resuming eating. At the same time, fasting can be more damaging to the body, excessive fasting may lead to depression, and due to prolonged lack of nutritional intake, it can also lead to malnutrition. In addition, prolonged fasting may lead to excessive stomach acid and damage to the gastric mucosa, thereby increasing the probability of gastric disease. Therefore, fasting is not recommended to achieve the purpose of weight loss unless there are special reasons. If you want to lose weight, you should adopt a healthy diet, such as a reasonable and regular diet, control the intake of staple foods and sweets, eat more vegetables and high-protein, low-fat food, such as chicken breast, soy products, etc., so as to reduce the intake of calories and create a calorie gap to achieve the purpose of weight loss. You can also increase sports exercise appropriately, such as swimming, brisk walking, badminton, etc. In addition, you should avoid eating within 30 minutes after exercise, because at this time the gastrointestinal blood vessels are in a state of contraction, eating will affect digestion, and you should also avoid drinking a lot of water to avoid a sudden increase in blood circulation and cause a burden on the heart.