Researchers have found that the enzyme polyphenol oxidase (PPO) in certain fruits like bananas can reduce the absorption of heart-healthy flavanols, especially when combined with flavanol-rich ingredients like berries. The study suggests choosing ingredients with low PPO activity, such as pineapple or oranges, when making smoothies to optimize flavanol absorption.
Yogurt is usually what thickens a shake. A half cup or so (maybe more idk; I don’t usually use it that’s what the banana is for) of unflavored plain yogurt.