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flag Bananas in smoothies may block absorption of heart- and brain-healthy flavanols, a study finds.

flag A University of California-Davis study finds that bananas in smoothies may reduce the body’s absorption of heart- and brain-healthy flavanols due to an enzyme called polyphenol oxidase (PPO). flag Participants who drank banana-based smoothies had 84% lower flavanol levels in blood and urine compared to those taking a flavanol supplement, while berry-based smoothies, with lower PPO activity, preserved absorption. flag The findings, published in Food and Function and funded by Mars Inc., suggest that avoiding bananas and using low-PPO ingredients like berries, pineapple, or mango may maximize flavanol benefits. flag Experts recommend reconsidering smoothie ingredients to enhance nutrient uptake, with further research needed on how food preparation affects absorption.

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