Eating purple grapes can help prevent the formation of plaque in artery walls which can cause arteries to narrow & harden.

Grapes contain flavonoids - quercitin and resveratrol - that are most concentrated in the skins, stems, and seeds of grapes rather than their juicy middle sections. These flavonoids have been shown to prevent the oxidation of LDL cholesterol ("bad" cholesterol) that leads to formation of plaque in artery walls. Your arteries are blood vessels that carry oxygen and nutrients from your heart to the rest of your body. A condition called atherosclerosis can result as a result of growing plaque deposits. This condition can cause the arteries to narrow and harden. Clogged arteries in different parts of the body can lead to multiple medical conditions. Flavonoids in grapes can also lower the risk of developing the blood clots that lead to heart attacks.