Grape juice is a significant source of resveratrol, a polyphenol antioxidant that is thought to be one of the health-promoting elements in red wine. Resveratrol appears to be involved in reducing the risk or slowing the development of cancer, heart disease, degenerative nerve disease, viral infections, and Alzheimer’s disease.
It also shows potential in treating bronchial asthma and helping prevent type 2 diabetes.
Resveratrol is most highly concentrated in grape skins, which is why red wine has greater potential health Benefits than white wine, for which the grape skins are less a part of the wine-making process.
Grapes and their juice also contain antioxidant anthocyanins and catechins, and some types also provide ellagic acid, myricetin, quercetin, kaempferol, and other phytochemicals and phenolics. They are a moderately good source of vitamin C and potassium, and they contain small amounts of a wide variety of minerals.Nutritional Facts
One-half cup of grape juice provides 77 calories, 19 g carbohydrate, 0 g protein, 0 g fat, 0.3 g dietary fiber, 4 mg sodium, and 10 mg calcium.