Eating grapefruit should not cause diarrhea. If you eat too much grapefruit at one time, it will not only affect the detoxification of the liver and damage it, but also cause other adverse reactions, even poisoning, including dizziness, nausea, palpitation, tachycardia, fatigue, low blood pressure and other symptoms. It is particularly dangerous to eat grapefruit or drink grapefruit juice during taking antiallergic drugs, which can cause arrhythmia, and even sudden death in severe cases. There are many drugs that can interact with grapefruit, such as calcium antagonists, antipsychotics, gastrointestinal drugs, immunosuppressants, central stimulants and so on. When taking these drugs, just drinking a glass of grapefruit juice may cause the above effects. Therefore, don't eat grapefruit or drink grapefruit juice when taking medicine, especially for elderly patients, to prevent accidents.
Traditional Chinese medicine believes that grapefruit is sweet and sour, cool in nature, and has the effects of regulating qi and resolving phlegm, moistening lung and clearing intestine, enriching blood and strengthening spleen. It is suitable for people with heat constitution, especially those with constipation. Eating grapefruit can clear away heat, purge fire and defecate. However, for people with gastrointestinal deficiency and cold, eating grapefruit will further damage the yang of the spleen and stomach, resulting in diarrhea, dull pain and discomfort in the epigastrium, etc., so we should try to avoid or eat grapefruit less. Patients with hot constitution, diabetes, hyperlipidemia and chronic constipation are more suitable for eating grapefruit.