Grapefruit flap also has a large and small, so it is not good to say how many flaps a day at most, but the “Dietary Guidelines for Chinese Residents” recommends that the daily intake of fruit should be about 300 grams, so the best intake of grapefruit a day should not exceed 300 grams, with other fruits together with the best intake of 300 grams. Grapefruit contains sugar, various vitamins, carotene, potassium, phosphorus and other trace elements, rich in nutritional value. It also has the effect of stomach, lung, blood, intestine, laxative and so on. However, grapefruit is cold, cold and cold body, weak stomach and intestines eat more, it is easy to lead to diarrhea, but also easy to aggravate the symptoms of cold body, such as cold and flu, dysmenorrhea; may also affect the digestive and absorption function, resulting in indigestion. It should also be noted that women taking birth control pills should avoid eating grapefruit to avoid affecting the absorption of birth control pills. High blood pressure patients should also be prohibited to eat grapefruit during the medication.