Some people experience mild diarrhea or stomach pain after a meal. If this is not due to spoiled food, it might be caused by incompatible food combinations.
For example, seafood such as fish, shrimp, and seaweeds are rich in protein and calcium. When consumed together with fruits high in tannic acid, not only is their nutritional value reduced, but calcium and tannic acid can also combine to form tannic acid, which can cause stomach pain, vomiting, nausea, and diarrhea.
Fruits with a high tannic acid content include persimmons, grapes, olives, pomegranates, and hawthorns. Therefore, these fruits should not be eaten with seafood at the same time. It is advisable to wait for at least 4 hours after consuming seafood before eating them.