Different colours of grape have different nutritional benefits.
Grapes are native to the Northern Hemisphere – some species come from the Mediterranean, some from Asia and many from North America. Dozens of species have been cultivated for food and wine-making for millennia.
The grapes you eat fresh are known as table grapes, have a thin skin and may or may not have small seeds. The grapes used to make wine are smaller, have thicker skins and larger seeds. Raisins, sultanas and currants are all simply dried grapes of various colours and sizes.