The fruit behind the "French Paradox" — and why whole grapes are the better bet than the wine.
Red and purple grapes carry resveratrol, one of the most publicly recognisable polyphenols — largely thanks to its association with red wine and the "French Paradox" discussion around wine and cardiovascular health.
Resveratrol is concentrated in grape skin, and has been studied extensively in laboratory and animal research for effects on inflammatory signalling, cellular aging pathways (including some overlap with the autophagy research covered elsewhere on this site), and cardiovascular markers. Human clinical trial results have been more modest than the laboratory findings alone would suggest, and the doses used in more striking animal studies are far higher than what eating grapes or drinking wine realistically provides.
Whole red grapes provide resveratrol alongside fibre and no alcohol — a meaningfully different, generally more favourable package than wine, which adds alcohol's own inflammatory cost (see our Alcohol pillar) on top of a smaller resveratrol dose than marketing sometimes implies.
Whole, unpeeled red or purple grapes — frozen grapes also make a genuinely satisfying cold snack with no added sugar.
If resveratrol specifically interests you, whole grapes (or grape skin extract) get you the compound without the alcohol trade-off that comes with wine.