What causes immediate diarrhea after eating?

Online Answer
A viral infection, such as stomach flu, is the most common cause of acute diarrhea. Food or water that is contaminated by bacteria or other germs can cause diarrhea. Eggs, poultry, soft cheeses, or raw foods are the most common culprits of this type of infection and diarrhea..
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Cooked eggs are also OK. Use low-fat milk, cheese, or yogurt. If you have very severe diarrhea, you may need to stop eating or drinking dairy products for a few days. Eat bread products made from refined, white flour.
Hallucinogenic mushrooms can give people stomach cramps or make them throw up. They also give some users diarrhea..
Caffeine-containing drinks have a laxative potential. More than two or three cups of coffee or tea daily can often cause diarrhea. Withdraw gradually over the course of a few days to avoid headache and try going without for awhile. Decaffeinated drinks may still contain chemicals that can loosen the stools..