Why don't people like to eat in hot weather?

After summer, children's appetite will be worse than before. Actually, I don't blame the children. After the summer, even adults don't want to eat. If you ask why you don't like to eat when the weather is hot, people who haven't studied medicine will say, "It's already hot, but it's even hotter after eating." Searching for a seemingly professional explanation from the Internet will tell you that you don't like eating in hot weather because of gastrointestinal problems, such as more consumption in summer, less enzymes involved in digestion, more sweating in summer, more drinking water and diluting gastric juice, so you don't like eating. The latter looks very professional, and some experts may say so, but after reading the relevant literature, I found that ordinary people feel more accurately about this issue. The regulation of appetite depends on the normal function of hypothalamus. Through the combination of different receptors in hypothalamus and different hormones, the central nervous system tells people whether to eat or not. Some hormones promote eating, while others inhibit eating. These hormones are inextricably linked, and it is difficult to play a decisive role through a certain hormone. But generally speaking, the hormones that promote eating are neuropeptide Y, growth-promoting hormone neuropeptide, melanin concentration hormone, glutamic acid, γ -aminobutyric acid and so on. Hormones that inhibit appetite include CRH-related peptide, neurotensin, glucagon-like peptide-1, melanocortin and so on. To discuss the influence of hot weather on appetite, we must first make clear what is the use of appetite, of course, in order to tell the human body to eat at the right time to maintain life. It's not like going to work, having a boss, rules and all kinds of advanced attendance instruments to supervise you. Eating is a more important life-sustaining behavior than working to earn wages, and the only way to supervise this important behavior is to rely on one's appetite. Appetite is life-sustaining. For mammals, including humans, one of the important tasks is to keep the body at a constant temperature. Now even illiterate people know that human body temperature can only fluctuate in a very, very narrow range, and a little higher or lower than this range may pose a threat to life. At low temperature, you need more energy to maintain your body temperature, so you need more food. On the contrary, at high temperature, it is more difficult for the human body to dissipate heat, so the demand for energy is lower. Not only that, eating itself can also cause a slight increase in body temperature. Even if food is not absorbed and converted into heat, even if you chew or even see food, your body temperature can rise slightly. Reflected in the appetite, generally when the weather is cold, the appetite is good, and when the weather is hot, the appetite is poor. Not only do you not like eating, but you eat less, and even think enough. It should be noted that this is only a speculation based on the physiologically famous feedback mechanism, and it really needs scientific proof. Judging from the existing evidence, it seems that it is only half proved that low temperature promotes appetite. Many experiments have proved that giving animals low temperature stimulation can increase their food intake. On the human side, athletes who exercise in low-temperature water will consume more calories than other athletes. At the molecular level, low temperature stimulation can reduce the level of CRH, a hormone that inhibits appetite. Since low temperature can promote appetite in this way, it is natural to speculate that high temperature can increase the level of CRH and thus reduce appetite. It sounds reasonable, but speculation is always speculation. Experiments such as the influence of high temperature on CRH and the influence of high temperature on animal feeding behavior are temporarily lacking, so there is not enough evidence in the second half. If there is insufficient evidence of the influence of body temperature setting on appetite, then there is no evidence of the so-called decrease of pepsin secretion and dilution of gastric juice, which is probably an expert's meditation or brilliant idea. Moreover, this statement is even more meaningless than the temperature setting statement, and it will also cause unnecessary waste and health risks. According to the temperature setting, it is completely normal not to like eating in summer. Since you don't like it, eat less, after all, it won't affect your health. And if you listen to the "stomach" theory, do you need to drink less water or supplement digestive enzyme preparations to ensure your appetite? Some colleagues may defend this preconceived view, because after all, gastroenteritis patients don't want to eat. I think such people should review the difference between physiological changes and pathological changes. Of course, there is a more peculiar point of view. An endocrinology professor said that eating less in summer is related to some women wearing less clothes and deliberately dieting to highlight their figure. But this explanation obviously has nothing to do with children. They should wait more than ten years before considering such a problem.