If you eat persimmons, it usually takes 2 hours for them to be fully digested. If you want to eat crabs, it is recommended to eat them after an interval of 4 hours to ensure a safe diet. Persimmon and crab should not be eaten together, if eaten at the same time can react in the stomach and can easily be poisoned. Persimmons are sweet and astringent, slightly cold, and contain a large amount of persimmon gum phenols and pectin, and immature persimmons still contain red tannin, which can clump together when they meet stomach acid. If you eat too many persimmons, the clots can turn into hard persimmon stones, damaging the gastric mucosa. The crab meat is rich in protein, and persimmons contain a lot of tannic acid, and the protein will also coagulate when it meets tannic acid, which is not good for health. Generally, persimmons can be digested only after about 2 hours of consumption, but the gastrointestinal peristaltic function of some people is slow, and the time of digestion can be extended, so it is recommended to consume crabs after 4 hours. In addition, persimmons and crabs are both cold foods, so it is recommended to eat them in small amounts, and to avoid them if you are pregnant or menstruating.