Ripe persimmons can be eaten with crabs, but unripe persimmons should not be eaten with crabs, as they will cause diarrhea and abdominal pain. Rumor has it that eating persimmons and crabs together will cause diarrhea and abdominal pain because unripe persimmons are eaten with crabs. When persimmons are unripe, they contain a lot of tannic acid, so they have a bitter taste, and if you eat them with crabs, which contain a lot of protein, it is possible to cause diarrhea and abdominal pain. However, ripe persimmons, that is, persimmons without a bitter taste, have a very low content of ellagic acid and will not cause diarrhea or abdominal pain even if eaten with crabs. In addition, crab is a kind of allergic food, not all people are suitable for consumption, the people who are allergic to crab should not eat crab.