Grapefruit belongs to a healthy fruit, there is no special restriction on the time of consumption, but the effectiveness of consumption at different times varies, such as eating before meals can make people feel full, so that the intake of other foods less, to achieve the effect of weight loss. Autumn is the golden time to eat grapefruit, grapefruit not only has high nutritional value, and has a stomach, lung, blood, intestinal, laxative and other effects, on some diseases have a good auxiliary effect. Grapefruit taste sweet and sour, moderate consumption before meals can stimulate the secretion of gastric acid, promote the digestion and absorption of food, control appetite. Half an hour after the meal can eat grapefruit in moderation to promote intestinal peristalsis and help digestion. However, grapefruit is good but not eat more, especially frozen grapefruit, need to take out of the refrigerator after half an hour before eating, so as not to stimulate the stomach, causing a burden on the gut. In addition, grapefruit is a cold food, diarrhea patients are advised to avoid eating, so as not to aggravate the diarrhea, resulting in the course of the disease dragged.