Introduction: 

While researching the health benefits of Grapes, I found many resources that speak highly of them. So I am going to summarize my findings, and then list some references for you to use to expand your knowledge.

In the Quran:

"He causes to grow for you thereby herbage, and the olives and the plam trees, and the grapes, and of all the fruits; most surely there is a sign in this for a people who reflect" Chapter: 16 , Verse: 11

" And in the earth there are tracts side by side and gardens of grapes and corn and palm trees having one root and (others) having distinct roots-- they are watered with one water, and we make some of them excel others in fruit; most surely there are signs in this for a people who understand" Chapter: 13 , Verse: 4 

Resveratrol, is the ingredient most talked about when raving about the benefits of grapes. It is a phytoalexin produced naturally by several plants when under attack by pathogens such as bacteria or fungi.
Grapes contain compounds called flavonoids which gives them their vibrant colors and play a role in decreasing the risk of heart disease.
Grapes, also, strengthen your heart muscle, lower your cholesterol, and contribute to fighting against high blood pressure and cancer.

References:
http://en.wikipedia.org/wiki/Resveratrol
http://www.whfoods.com/genpage.php?tname=foodspice&dbid=40