What does grape milk mean?

It is a drink of grape juice and milk.

Grape juice, as the name suggests, is juice squeezed from grape pulp. Grapes contain 0.5% plant fiber as well as potassium chloride, iron and phosphorus. The grape juice produced also contains a large amount of sugar that is easy to digest and absorb. The carbohydrate content is as high as 16%, most of which is glucose. Grape juice is often fermented to make wine, brandy or whiskey. In the winemaking industry, grape juice is an essential product.

Drinking a glass of grape juice every day does lower blood pressure, which in turn reduces the risk of stroke and heart disease. Recent research also shows that grape juice helps enhance liver function and promote bile secretion. Grapes also contain substances similar to insulin secreted by the pancreas, so doctors include grape juice in the diet of diabetics and as a nutritious food for patients with gout, arthritis and rheumatism.

Reference for the above content: Baidu Encyclopedia--Grape Juice