Leaving bananas out of a blueberry smoothie may help preserve its polyphenols. Bananas contain an enzyme that can oxidize several compounds found in blueberries.
So about a month ago the internet kinda blew up when Dr. Rhonda Patrick said you might not want to mix bananas with blueberries
Basically.. blueberries have polyphenols in them (beneficial molecules.. so many benefits), and bananas have an enzyme in them that degrades polyphenols
So... if you want to maximize polyphenols availability from blueberries, and why wouldn't you??, it just makes sense not to consume them at the same time
I was skeptical but in her new podcast, Rhonda breaks down the science a bit more. Check it out
Here is the timestamp where it starts
She says she uses an avocado instead