According to relevant public information, grape juice sometimes becomes sweet. As a non-alcoholic beverage, it is necessary to use pasteurization to preserve grape juice, because untreated juice often contains yeast naturally on grapes, which will naturally ferment to produce alcohol.
Grape juice, as its name implies, is the juice squeezed from grape pulp. Grape contains 0.5% plant fiber, potassium chloride, iron and phosphorus. Grape juice also contains a lot of sugar that is easy to digest and absorb, and the carbohydrate content is as high as 16%, most of which is glucose.