Another subclass of polyphenols you should pay attention to are lignans. They can be found in flaxseed and have also been linked to decreased mortality rates.
Nutrition pros approve of flaxseed for its ability to help reduce inflammation, balance hormones, protect against mood swings and depression, and prevent heart disease and diabetes. The combination of polyphenols and an abundance of omega-3 fatty acids make flaxseed a nutritional powerhouse for cardiovascular health, says LeeAnn Smith Weintraub, R.D., M.P.H., of Los Angeles. "To get the greatest benefit, consume ground flaxseed and keep it refrigerated."