Green grapes and black grapes have the same health benefits. They both help prevent ageing, improve skin, contain vast amounts of fibre which helps in your digestion and vitamins to help with immunity and strength. They also help stabilize blood sugar. All these qualities of grapes are because of one key element: resveratrol. And the only difference between green and black grapes is that grapes in darker shades have a much higher amount of resveratrol.