Flaxseeds contain about 7 times as many lignans as the closest runner-up food (sesame seeds). They contain about 338 times as many lignans as sunflower seeds, 475 times as many as cashew nuts, and 3,200 times as many lignans as peanuts.
When flaxseeds are compared with other commonly eaten foods in terms of their total polyphenol content (polyphenols are one very important group of antioxidants), flaxseeds rank 9th among 100 commonly eaten foods. Flaxseeds turn out to be significantly higher in polyphenol antioxidants than fruits like blueberries or vegetables like olives. The antioxidant benefits of flaxseeds have long been associated with prevention of cardiovascular diseases and have recently also been tied to decreased insulin resistance.