Persimmons contain a large amount of persimmon gum phenol, and also contain red tannin, a soluble astringent. The peel of ripe persimmons contains the highest content of these two components. Persimmon gum phenol and red tannin have the property of coagulating into blocks when exposed to acid. If you eat a large number of persimmons on an empty stomach, the persimmon gum phenols and red tannins will condense with gastric acid into hard lumps, forming "persimmon stones". If there are "persimmon stones" in the stomach, it will cause stomach pain, nausea, and vomiting. If the cause of stomach pain is still not found and you continue to eat persimmons on an empty stomach, the lumps will get bigger and bigger, which will increase the pressure in the stomach, cause gastric dilation, and cause diseases. Eating persimmons and eating acidic foods at the same time will also form "persimmon stones". Therefore, persimmons should be eaten after meals, so that the appearance of "persimmon stones" will be avoided due to the combination of gastric acid and food.