Inflammation has been shown to play a critical role in hardening of the arteries and many chronic diseases like heart disease, arthritis, and diabetes. Dietary flavonoids have been shown to reduce inflammation. Purple grape juice is a rich source of dietary flavonoids. This study examined the effects of purple grape juice (about 2 cups/day) for 8 weeks on inflammatory markers in a group of smokers. The results indicated that the blood of subjects supplemented with purple grape juice had greater flavonoids and this was associated with reduced levels of some inflammatory markers.

Deal S, et al. Effect of purple grape juice ingestion on inflammatory markers in smokers. Federation of American Societies for Experimental Biology, Washington D.C., April, 2004. Abstract #362.7.