it's not hard to find that some people eat too much, and eat while holding their stomachs. The reason is that research shows that food can make the human body secrete a substance similar to drugs. The food in the buffet always makes us lose control until we are full and even have difficulty breathing. In this regard, scientists have discovered an interesting principle: feeding will have an anesthetic effect and relieve uncomfortable feelings such as pain. This is our evolved biological instinct, which overrides all rationality. Dr Gary l winkle, a professor of psychology at Ohio state university, said that even if you have a stomachache, your gluttony has lost face in front of friends and family, and you will continue to eat. At first, your body secreted endogenous opium-like substances, which prevented the above-mentioned bad feelings. Scientists have found that when we eat delicious food (such as chocolate), our response to pain is significantly reduced. This explains why we can still eat willfully after eating a big meal. After we eat snacks, the more we eat, the more painful we feel. In recent years, studies have found that the levels of endogenous cannabinoids in blood and brain of obese people are higher than those of ordinary people. Eating fast food can make people produce this substance continuously to relieve our physical and mental discomfort when we eat too much. Our brains evolved in times of food shortage. Therefore, heredity determines that we should eat as much as possible, otherwise we will be eliminated naturally. Therefore, human appetite is too strong. Experiments in neuroscience have confirmed that people will unconsciously prevent others from getting close to their own food. The latest research also found that although the food has gone bad or tastes bad, as long as it is convenient for you, you can get it and we will eat too much.