Because the grape skin is rich in the following kinds of nutrients: resveratrol, with lowering blood lipids, anti-thrombosis, prevention of atherosclerosis, enhance immunity, etc.; tannins, with anti-allergy, delay aging, enhance immunity and prevention of cardiovascular disease; anthocyanins, with strong antioxidant, anti-mutagenic, reduce liver dysfunction, cardiovascular protection and other functions. So it makes sense to eat grapes without spitting out the skin.

Alternatively, red grape skins have a higher nutritional value than white grape skins.

At the same time, due to the current market grapes, most of the epidermal residues of certain pesticides and other chemical ingredients, so to remind everyone, before eating grapes must be cleaned, it is best to first rinse with water, with the ability to effectively remove the chemical components of the detergent, cleaning more than two minutes. However, it is not advisable to soak in water, because the water soaking is easy to promote the surface of the grape residual pesticides penetrate into the flesh.