6. Improved Bone Health
Grapes provide many of the minerals critical to bone health, vitamin K being chief among them. Vitamin K plays a strong role in keeping calcium inside your bones, preventing it from leaching out into the bloodstream.
In a nice kind of synergy, grapes also contain some calcium, as well as phosphorus, magnesium, potassium, and manganese. Rat studies have shown that resveratrol can lead to improved bone density, too, but further studies in humans are necessary to confirm this.