Multiple studies have shown that certain polyphenols can alter oxidative balance by inducing apoptosis -or cell death- in cancer cells and preventing development by controlling oxidative stress. 

This is the first human study on this subject, and the results reinforce earlier, preliminary studies where consuming grapes was found to protect retinal structure and function.

Researchers have found that the antioxidants in grapes can protect the brain against developing dementia by improving the function of neurons or nerve cells.