Dry wine contains almost no sugar, so diabetics can safely drink it. An Israeli scientist has followed up 200 diabetics for two years. The results showed that drinking red wine had no effect on diabetic patients, but increased their metabolism.

Wine contains a lot of tannin, which is an antioxidant, which can slow down the aging of human body and have a cosmetic effect. Tannin comes from grape skin. After wine is fermented, tannins in grape skin will be extracted into wine. When we eat grapes, we just don't eat skins. So there is no tannin in the grape juice.

Resveratrol in wine is one of the main contributors to the health care function of wine. Resveratrol exists in both grape juice and wine, but the resveratrol content of some professional wine grapes is several times that of ordinary edible grapes, so the health care function of wine will be better than that of grape juice.

Compared with other fruits, the sugar content of grapes is very high. If squeezed into juice, you will unconsciously consume more sugar, which is not good for your health, especially for diabetics and the elderly. Therefore, when drinking grape juice, it is more appropriate to drink only a small glass. In fact, if you want to keep healthy, you'd better drink wine.