Yes, persimmons and crabs will be poisoned when eaten together. Persimmons can't be eaten with crabs and seafood. As long as the food containing protein can't be eaten with persimmon, it will be poisoned. Persimmons can't be eaten on an empty stomach, and small stones will grow in the stomach after eating them. Sweet potatoes can't be eaten with persimmons. If you eat them, you will get liver stones.