If you accidentally eat expired food, it is likely to have some effect on your stomach and intestines, which will lead to gastroenteritis and food poisoning. Gastroenteritis is a disease caused by microbial infections, which may be caused by chemical poisons or drugs. The symptoms are diarrhea, abdominal pain, nausea, fever, and poor appetite, which can be treated with other medications such as oral gastroenteritis and Simethicone. During the day, it is important to drink more water, maintain a certain diet, do not eat spicy and other stimulating and greasy, cold food, and eat more light, easily digestible food to reduce the burden on the stomach and intestines. In serious cases, you can go to the hospital for routine testing to check for inflammation and then for further treatment. Before eating food, make sure to check whether the food is within the shelf life, and don’t take any chances with expired food, as the toxins in expired food are likely to have a carcinogenic effect on the human body.