According to the determination, grape berries contain about 15% ~ 30% of sugars (mainly glucose, fructose and pentose), various organic acids (malic acid, tartaric acid and a small amount of citric acid, succinic acid, gallic acid, oxalic acid and salicylic acid) and minerals, as well as various vitamins, amino acids, protein, carbohydrates, crude fiber, calcium and salicylic acid. Especially, modern medicine has found that grape skins and grape seeds contain antioxidant resveratrol, which has positive preventive and therapeutic effects on cardiovascular and cerebrovascular diseases. Eating more grapes, drinking grape juice and drinking in moderation are very beneficial to human health. Postpartum women can eat some grapes or drink some wine after meals, which can not only help blood circulation, but also increase hemoglobin in the body. 1. It depends on the food mix. If the daily diet is high in calories, eating grapes is easy to get fat, at least it is not conducive to losing weight, because grapes are high in calories and sugar. If your diet is already thin, it doesn't matter if you eat more. 2. Red grapes will promote melanin precipitation on the face and produce spots. But I haven't heard that eating grapes will precipitate melanin. Grapes are rich in iron. It can nourish blood and beauty. If you are worried about this, you can eat grapefruit, which can inhibit pigmentation and whiten your skin. It can supplement the nutritional value of grapes: according to the determination, besides water, grape berries also contain about 15% ~ 30% of sugar (mainly glucose, fructose and pentose) and various organic acids (malic acid, tartaric acid and a small amount of citric acid, succinic acid and gallic acid). And various vitamins, amino acids, protein, carbohydrates, crude fiber, calcium, phosphorus, iron, carotene, thiamine, riboflavin, nicotinic acid, ascorbic acid, lecithin, etc. Especially, modern medicine has found that grape skins and grape seeds contain antioxidant resveratrol, which has positive preventive and therapeutic effects on cardiovascular and cerebrovascular diseases. Eating more grapes, drinking grape juice and drinking in moderation are very beneficial to human health. Postpartum women can eat some grapes or drink some wine after meals, which can not only help blood circulation, but also increase hemoglobin in the body. China ancient medicine also recorded the medicinal use of grapes. Grapes are sweet, sour and flat, and enter the lung, spleen and kidney meridians, which can replenish qi and blood, strengthen bones and muscles, dredge meridians, relieve stranguria, reduce swelling, facilitate urination, nourish kidney and benefit liver. Grape roots and leaves are also Chinese herbal medicines. Grapes are prone to diarrhea and should not be overeating. Medically, it has the functions of tonifying kidney, strengthening waist, nourishing blood, lowering blood pressure and stimulating appetite, especially in the prevention and treatment of neurasthenia, stomachache, abdominal distension and cardiovascular diseases. Herbs in southern Yunnan say "tonify qi and blood, relax tendons and activate collaterals". "The Picture of Materia Medica in Southern Yunnan" says that treating acne is toxic, and the fetal qi is rushing up, and the decoction can be drunk immediately. Herbal rejuvenation says warming the stomach and strengthening the spleen. "Living Diet Spectrum" holds that it "benefits qi and nourishes kidney, liver and yin, strengthens bones and muscles, quenches thirst and prevents miscarriage". "Luchuan Materia Medica" records: "Nourish and strengthen the body, enrich the blood and strengthen the heart and diuresis, and treat low back pain, stomach pain, mental fatigue and blood deficiency heartbeat." Grape contains high iron content, which is of great benefit to people with iron deficiency anemia and is an auxiliary measure for treatment. Grape juice, seeds and skins are rich in strong antioxidant substances-resveratrol and flavonoids, and their contents in skins and seeds are better. Resveratrol and flavonoids have thrombolytic and anticoagulant effects of aspirin, and can prevent ischemic stroke, such as cerebral infarction and cerebral thrombosis. Grapes are rich in nutrition. According to scientific analysis, it contains more than a dozen indispensable amino acids such as glutamic acid, arginine and tryptophan. Therefore, eating some grapes regularly is of great benefit to the normal activities of the nervous system and cardiovascular system and can prolong life. The ancients also said: "Eating grapes for a long time is not old." Grape has high nutritional value, and grape juice is praised as "plant milk" by scientists. The sugar content of grapes is about 10%-25%, and the highest is about 30. Most of the sugar contained in grapes is glucose that can be directly absorbed by human body, so grapes become an ideal fruit with weak digestive ability. Grapes contain more tartaric acid, which is more helpful for digestion. Eating more grapes properly can strengthen the spleen and stomach, which is of great benefit to the body. Medical research has proved that grape juice is the best food for patients with inflammation, which can reduce the contents of protein and sodium chloride in blood. Grape juice plays an auxiliary role in the rehabilitation of weak patients, arteriosclerosis patients and nephritis patients, and the incidence of cancer is also significantly reduced in places where grapes are planted and eaten more. Grape is the fruit with the most complex iron element, and it is a nutritious food for anemia patients. Eating grapes regularly is beneficial to neurasthenia and fatigue. After the grapes are dried in the sun, the contents of sugar and iron are relatively increased, which is a good tonic for children, women and people with weakness and anemia.