The longan is delicious, but easy to fire, usually each person can not eat more than 6 taels of longan per day, about 15 pcs. Because of the excessive consumption of longan lead to "longan disease" attack. Its symptoms are: diarrhea, nosebleeds, mouth ulcers, inflammation of the oral mucosa, constipation and so on. Longan is a nutritious fruit that can increase the appetite, but it is easy to make people "on fire" at the same time. Therefore, the consumption of such fruits should not be too much, especially children, the elderly and suffer from chronic tonsillitis, pharyngolaryngitis, "weak fire", constipation, diabetes and other diseases, should not eat or eat less longan and other "fire" type of fruit. No such diseases of the public, a day time to consume the number of longan should be controlled in about 4 two, not more than 6 two per day. Nutritionists have found that every 100 grams of longan pulp containing whole sugar 12% to 23%, glucose 26.91%, tartaric acid 1.26%, protein 1.41%, fat 0.45%, vitamin C 163.7 mg, vitamin K 196.6 mg, as well as vitamins B1, B2, P, etc., after treatment of the production of fruit drying, every 100 grams of sugar content of 74.6 grams of iron 35 mg, calcium 2 mg, phosphorus, and so on. The dried fruit contains 74.6 grams of sugar per 100 grams, 35 milligrams of iron, 2 milligrams of calcium, 110 milligrams of phosphorus, 1,200 milligrams of potassium and other minerals, as well as a variety of amino acids, saponins, X-glycine, tannins, choline, etc., which is the source of its powerful tonic ability. Longan is rich in glucose, sucrose and protein, etc. It is also high in iron, which can boost calories and nutrition while promoting hemoglobin regeneration, thus achieving the effect of blood tonicity. Research has found that longan meat, in addition to the whole body has a tonic effect, the brain cells are particularly effective, can enhance memory, eliminate fatigue. Modern people live a busy life, frequent use of the brain, coupled with a short rest time, it is easy to forget, the phenomenon of forgetfulness, every day to longan meat soaked in water as a tea to drink, you can make you unknowingly become clear-headed, improve memory. If you are suffering from insomnia caused by nerve excitation after overuse of the brain, you may want to use longan meat to cook soup and drink, which can play a role in tranquilizing the mind and sleep. Longan's tranquilizing effect is very strong, which contains a large amount of iron, potassium and other elements can be treated due to anemia caused by palpitations, panic; and, longan in the niacin content of up to 2.5 mg per 100 grams, can be used to treat dermatitis caused by a lack of niacin, diarrhea, dementia, and even insanity. Longan also has a striking ability - can destroy cancer cells. Japanese research has found that longan is a pioneering force against cancer. Regular consumption of longan can reduce the chances of cellular carcinogenesis and has a certain inhibitory effect on cancer cells. In addition, the flavoprotein in the human body is closely related to the aging process of the human body, and certain special substances in longan can inhibit its production and activity, and reduce blood fat, increase coronary blood flow, and play a role in lowering fat to protect the heart and slowing down the aging process. Women because of the monthly physiological period will be fixed loss of blood, so it is easy to suffer from anemia, about 20% of women, 50% of pregnant women will have anemia. If it is not very serious, as long as the adjustment of diet can change the symptoms of anemia - longan is a very good choice, coupled with its sweet taste, juicy and delicious, so many beautiful women will be it as a treasure of beauty. Eat longan often, indeed have to make the face rosy, good color good beauty effect, it can also make the hair black, is quite rare delicious and therapeutic effect of both fruits. However, everything has its disadvantages, some women buy longan frequency is very high, almost every day to eat, experts said that this not only fails to achieve the effect of beauty, but also damage to the body. And as the saying goes: "one side of the water and soil to raise a person", women in the north to maintain the face, it is best to choose some of the fruits produced in the north; in addition, eat fruit to see its "attributes", easy to acne, acne and skin oily people usually best to eat more apples, pears and other cool fruits! Pear and other cool fruits. Longan is a warm fruit, there are blood and gas function, the weak and just gave birth to a child in labor to eat some longan, on their physical recovery is very good. However, normal women eat too much longan will "attack the fire on the body", resulting in the face of long pimples, serious will also affect menstruation. In addition, pregnant women should also eat less longan. Although from the nutritional composition, longan contains glucose, sucrose, vitamin A, vitamin B and tartaric acid and other substances, nutrients are very rich, the motherland of medicine also believes that cinnamon has to tonify the heart and tranquillize the mind, nourish the blood and benefit the spleen effect, but most of the women are pregnant yin and blood is weak, often have dry stools, dry mouth and fetal fever symptoms, at this time to eat cinnamon not only do not get the nourishment it deserves, but also abdominal pain and abortion, and other adverse reactions. Some people think that eating longan during pregnancy, the baby's eyes will be born "like longan kernel as black and bright", in fact, this is just a folk saying, there is no scientific basis, so expectant mothers should not be in order to "give birth to a bright-eyed baby" and a large number of food! Longan, otherwise it will harm the body and the fetus.