Guava is warm, sweet, sour and astringent, and has astringent effect, so it can be eaten by general healthy people. However, people who are prone to get angry at ordinary times and people with poor gastrointestinal digestive function should eat less. Because guava is warm and convergent, people who suffer from constipation due to excessive internal heat and hot stomach and intestines will aggravate constipation if they eat too much. On the other hand, guava is rich in cellulose, which can increase the amount of stool. For constipation people who are unable to defecate due to qi deficiency, eating guava too much will aggravate the difficulty of defecation and make constipation more serious. In addition, guava, especially the seeds inside, is not easy to digest, so people with poor digestive function and people with stomach diseases, gastric bleeding and intestinal bleeding are not recommended to eat more.