Skin can also be eaten.
Grape skin, grape meat and grape seeds are nutritious, each with its own merits, and all of them can be eaten. The nutrition of grape meat is mainly reflected in the content of vitamin C, while grape skins and seeds have other nutrients.
Although the variety of nutrients in grape pulp is complete, except for the high content of Vc (25mgVc per100g on average), the main nutrients of grape are its phytochemical active substances, most of which are in skin and seeds. Among them:
organic acid
Organic acids in grapes mainly exist in skins, and tartaric acid and malic acid are the main ones. It can promote the secretion of salivary glands and help digestion; Promote the absorption of iron: the trivalent iron in plants can not be directly absorbed by human body, and it needs the help of organic acids to be converted into divalent iron to be absorbed; Promote the absorption of calcium: As we all know, when pregnant, we especially want to eat sour things, because a lot of calcium in the body needs acidic substances to promote the absorption of calcium, and organic acids in fruits are the best assistants to assist calcium absorption. But the taste is particularly sour, accompanied by bitterness.
anthocyanin
It mainly exists in skin. Anthocyanin is one of the best free radical scavengers at present, and it is the defense soldier of human body. It can participate in all diseases related to free radicals (such as anti-cancer, immune system enhancement, vascular diseases, anti-inflammation, radiation resistance, etc.), and can also promote the regeneration of rhodopsin in retinal cells and prevent myopia. Among them, black grapes are especially rich.
resveratrol
It mainly exists in grape skins and grape seeds, and is one of the old enemies of cancer. It has a good effect on breast cancer, oral cancer, gastric cancer, liver cancer, prostate cancer, etc., and can regulate immunity, inhibit the activity of cell carcinogenesis enzymes, and induce apoptosis of tumor cancer cells (yiqig.cn).
Quercetin
It is the main component of flavonol compounds in flavonoids, and it is also a kind that can often be ingested. It exists in many fruits and vegetables (grapes, mangoes, tea, onions, etc.). Medical research has proved that quercetin has a good resistance to viruses and tumors, and can enhance the dilation of capillaries, reduce the fragility of capillaries, dilate coronary arteries and increase blood flow.
tannin
It is an acidic substance in plant polyphenols. It exists in grape skins and grape seeds. If it exists, it will have astringent taste. Its most prominent physiological function is to prevent cardiovascular diseases and anti-cancer activity.
grape-kernel oil
Grape seed oil of grape seeds is mainly polyunsaturated fatty acids needed by human body. It plays an important role in infant brain development and cell recovery, and can also help remove "bad" cholesterol from the blood.