Cereal grains are one of the largest food sources worldwide, and wheat and rye are common whole grains. Phenolic compounds and acids are concentrated in the bran, the grain's outer skin. Food processing significantly reduces polyphenol content. For example, white bread has a phenolic acid concentration of 14 μg/g, while wholemeal breads have concentrations of up to 1400 μg/g. Choose wholegrain products for maximum polyphenol content.

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