Food & Function

Research suggests that bananas contain polyphenol oxidase (PPO), an enzyme capable of breaking down beneficial polyphenols found in ingredients like blueberries. A study published in Food & Function analyzing food absorption showed participants absorbed significantly fewer plant compounds after drinking a banana smoothie compared to taking supplements. However, some dietitians caution that the findings were based on only eight participants and that bananas still provide beneficial nutrients like fiber.

A study suggests that adhering to the 'five a day' fruit and vegetable guideline may not provide sufficient flavanols—plant compounds linked to cardiovascular benefits. Researchers found that fewer than 25% of adults meeting dietary guidelines achieved the 500mg daily flavanol intake associated with reduced heart disease mortality.