Pecans have the highest level of flavonoids among tree nuts. The results of a 2018 study in Nutrients suggest that these biochemicals in tree nuts may help improve insulin sensitivity and reduce the risk of developing cardiovascular disease. The study hypothesizes that tannins, ellagic acid, and urolithins in pecans may mitigate gene expressions related to inflammation that lead to chronic metabolic disease. These nuts contain 493 mg polyphenols per 100 g.

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