Pomelo is the mature fruit of rutaceae evergreen fruit tree, also known as Zhuluan, Leiyou, Qigan, Wendan and so on. Fresh grapefruit contains insulin-like, naringin, neohesperidin, volatile oil, vitamin B 1, vitamin B2, nicotinic acid, vitamin C, fructose, glucose, protein, lipids, iron, calcium, phosphorus and crude fiber. Traditional Chinese medicine believes that grapefruit is sweet, sour and cold, and has the functions of invigorating stomach, promoting digestion, reducing qi and resolving phlegm, and being light and happy. Modern medical research has found that grapefruit meat is rich in vitamin C and insulin-like components, so it has the effects of lowering blood sugar, reducing blood fat, losing weight and beauty beauty. Regular consumption helps to treat diseases such as hypertension, diabetes and arteriosclerosis. It has the functions of strengthening body constitution and beauty beauty for obese people. "The smoke in the tree cage is suspected of carrying water, and the mountains are like hanging gold. This is a famous sentence by Zhang Tong, a poet in the Tang Dynasty, from which we can see the beautiful harvest of pomelo, which is fascinating. Pomelo is called "Pomelo" in Shen Nong's Notes on Materia Medica, "Tiao" in Er Ya, "Lei Pomelo" in Guang Zhi and "Pomelo" in Tao Hongjing. There are also Hu Citrus, Smelly Orange, Smelly Pomelo, Bamboo Luan, Xiangluan and Dan Wen. It belongs to the fruit of Rutaceae evergreen tree pomelo. Its hometown is in China, and it has been cultivated for more than 2500 years. Widely planted, so there are many varieties. The famous varieties are Wendan pomelo, Shatian pomelo, Pingshan pomelo, Sijipao, Dahongpao and so on. , are the best in China pomelo. Grapefruit is picked from Mid-Autumn Festival to Mengdong and is the best fruit in autumn and winter. The fruit has beautiful appearance, thick skin and fresh meat, crystal clear juice, moderate sweet and sour taste and rich flavor. Peel off the skin, tear off the fluffy white clothes, and take a bite of juicy white jade comb grapefruit meat, which is sweet and fragrant. If it is stored for several months, its fragrance will not decrease and its taste will be more delicious, so it has the reputation of "canned natural fruit" If the ripe grapefruit is aged indoors, it will be fragrant and refreshing. It is often an essential fruit for family reunion in autumn and winter, symbolizing reunion and happiness. According to modern pharmacological analysis, the pulp and peel of grapefruit are rich in pomelo peel, immature bitter orange, new orange peel and carotene, vitamin B 1, B2, C, P, nicotinic acid, citric acid, calcium, phosphorus, iron, sugar and volatile oil. Pomelo peel is similar to other flavonoids and has anti-inflammatory effect. Pomelo peel complex has stronger anti-inflammatory effect than pure product, and has protective effect on virus infection in mice. Naringin has spasmolytic effect. Citrus grandis and Fructus Aurantii Immaturus can improve the hemagglutination of eyeball conjunctiva and decrease of capillary resistance caused by vitamin C deficiency in mice. Vitamin P is beneficial to the rehabilitation of patients with cardiovascular diseases and obesity. Niacin is an "anti-pellagra vitamin". Citric acid has the functions of preventing anemia and eliminating human fatigue. Fresh grapefruit juice still contains insulin-like components, which can reduce blood sugar in the body and play a certain role in the prevention and treatment of diabetes. Chinese medicine believes that grapefruit tastes sweet and sour, and its nature is cold. Pomelo peel tastes sweet and hard, and its nature is warm. Both of them can eliminate phlegm and promote digestion, reduce qi and accelerate diaphragm, and are mainly used for cough and asthma, qi stagnation, chest tightness, abdominal cold pain, food retention, hernia and so on. " "Rihuazi Materia Medica" says that grapefruit can "treat pregnant women with less food and weak mouth, and bad breath in the stomach. Xiaoshi, go to the stomach. Solve all kinds of poisons and treat the smell of wine. "Compendium of Materia Medica" says: pomelo peel can "promote digestion, accelerate diaphragmatic movement, dispel anger and resolve phlegm." The Journal of Sichuan Traditional Chinese Medicine says that it can "relieve alcoholism, treat renal edema, food stagnation, wet phlegm cough and hernia." A recent medical study abroad shows that grapefruit can lower cholesterol and prevent heart disease. This study conducted by American medical researchers confirmed that pectin in grapefruit can not only reduce the level of low-density lipoprotein, but also reduce the damage of arterial wall. This achievement was discovered by the researchers who have been engaged in the research on the relationship between various dietary fibers and dental plaque on animal arterial wall for a long time in the experiments on pigs. Later, the same conclusion was obtained in human experiments. According to the researchers, pectin in eight pomelo peels is enough to interfere with the absorption of low-density lipoprotein cholesterol in the small intestine. This pectin is a sticky substance, which is more easily used by the intestine after being mixed with soybean protein powder, thus increasing the effect of preventing heart. Grapefruit is a nutritious fruit that people like, but experts have found that it contains an active substance, which can inhibit the intestinal tract and interfere with the metabolism of many drugs. If you eat too much grapefruit at one time, it will not only affect the detoxification of the liver, but also cause other adverse reactions, even poisoning, including dizziness, nausea, palpitation, tachycardia, fatigue, low blood pressure and other symptoms. Eating grapefruit or drinking grapefruit juice during taking the antiallergic drug Terfenadine is particularly dangerous, which can lead to arrhythmia and even sudden death in severe cases. There are many drugs that can interact with grapefruit, such as calcium antagonists such as nifedipine, verapamil and diltiazem, antipsychotics such as clozapine, gastrointestinal drugs such as cisapride, immunosuppressants such as cyclosporine A and central stimulants such as caffeine. Experts pointed out that when taking these drugs, just drinking a glass of grapefruit juice may cause the above effects. Therefore, medical experts earnestly warned patients, especially elderly patients, not to eat grapefruit and not to drink grapefruit juice when taking medicine to prevent accidents.