<s>[INST] Hello doctor, Please tell me what are the things that can happen when you eat expired food. [/INST] Hello. If we eat food that is expired, the efficiency of the preservative is lost. So some organisms if present can multiply and can send some endotoxins. Also, the taste and odor can be altered. The food has a shelf life. If this is crossed some people can have diarrhea or acidity in the stomach. This can be due to the chemical nature of the food. </s>