Eating tomatoes after diarrhea may be related to food poisoning, fasting a large number of food, gastrointestinal allergies, etc. If you have gastrointestinal diseases, diarrhea can also occur due to food irritation. 1. Food poisoning: after eating moldy tomatoes, acute gastroenteritis may be induced by bacterial or fungal infection, which may be accompanied by abdominal pain and other symptoms. 2. fasting a lot of food: because tomatoes contain more phytic acid, if you eat too much on an empty stomach, it is easy to stimulate the gastrointestinal tract, leading to intestinal peristalsis too fast, which in turn causes the stool is not shaped, or even diarrhea and other symptoms. 3. Gastrointestinal allergy: If you are allergic to tomatoes, it is easy to cause an allergic reaction in the gastrointestinal tract after eating tomatoes, resulting in diarrhea and other symptoms. 4. Gastrointestinal tract underlying diseases: If you suffer from gastrointestinal diseases such as enteritis and irritable bowel syndrome, consuming tomatoes may trigger the onset of the disease, diarrhea, abdominal pain and other symptoms. There are many other causes of diarrhea after eating tomatoes, if the symptoms are serious, or continue to see no improvement, it is recommended to go to the regular hospital in a timely manner, after a clear cause of the disease, targeted treatment under the guidance of the doctor.