One of the reasons why crabs and persimmons can't be eaten together is that they are both cold things. At the same time, eating them will increase the coldness and easily cause discomfort such as abdominal pain or diarrhea, especially for people with weak spleen and stomach function. People with better spleen and stomach function will probably have no discomfort if they eat a small amount. If you want to eat persimmons after eating crabs, it is best to have an interval of more than 3 hours. It is generally recommended not to eat on the same day.

Of course, if the gastrointestinal function is good and you don't eat much crabs and persimmons, it is ok for more than 4 hours. In addition, you can use ginger and vinegar to drive away the cold when eating crabs, and it will be better to eat persimmons for a while. The second reason why crabs and persimmons cannot be eaten together is that persimmons are rich in tannic acid. Under the action of gastric acid, this substance can react with protein to produce tannic acid protein, which precipitates in the stomach and condenses into blocks.

Extended data:

If the amount of tannic acid protein is enough, it will easily condense into large pieces, block the gastrointestinal tract and affect digestion. In severe cases, there will be stomach pain, abdominal pain or vomiting. Modern medicine calls this symptom gastrolithiasis. However, whether eating crabs and persimmons together will form stomach stones depends on the gastrointestinal function of the consumers. People with good gastrointestinal function have normal gastrointestinal peristalsis, and the tannic acid protein produced will not have the opportunity to coagulate, so there will be no stones.

At least a part of protein will become tannic acid protein and cannot be absorbed by the body, so try not to eat crabs and persimmons at the same time. In fact, all foods containing tannins, such as persimmons, black dates, hawthorn or pomegranate, should not be eaten too much at a time. If you eat too much food rich in tannic acid on an empty stomach, you will suffer from gastrolithiasis even if you don't eat crabs. Persimmon is rich in vitamins, calcium, carotene and other nutrients, and has the functions of clearing away heat, moistening intestines, stopping bleeding and lowering blood pressure.

Persimmon has a high sugar content, mainly sucrose, glucose and fructose, which can be easily absorbed after eating and raise blood sugar. It is harmful to people with diabetes, especially those with poor blood sugar control. Tannic acid in persimmon can combine with iron in food and hinder the absorption of iron in food. Therefore, anemia patients should eat less. Persimmon is suitable for people with normal digestive function of spleen and stomach. In addition, the formation of gastric persimmon stone may be related to gastric dysfunction.

References:

Eating crabs in autumn requires 8 taboos-People's Daily Health Channel-People's Daily Online.