Do bananas really kill the benefits of blueberries? This question has sparked debate after a biomedical scientist claimed that adding banana to a blueberry smoothie could reduce the nutritional value of the berries. The claim, made on the Mel Robbins Podcast by Dr. Rhonda Patrick, centers on an enzyme called polyphenol oxidase (PPO) found in bananas. But is there truth to it? Let's explore the science.
The Claim: Bananas and Blueberries Don't Mix
Dr. Patrick stated that polyphenol oxidase, an enzyme present in bananas, breaks down polyphenols—antioxidant compounds found in blueberries. She cited studies showing that adding bananas to blueberries lowers the amount of polyphenols available for absorption. "The banana is killing the benefit," she said. This claim quickly gained traction, especially given bananas' rising popularity as a trendy flavor in 2026.
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What Does the Science Say?
The most likely source for this claim is a 2023 study that examined how polyphenol oxidase affects the absorption of flavanols, a type of polyphenol. Participants who drank a banana smoothie with added flavanol had lower blood levels of these antioxidants compared to those who drank a mixed-berry smoothie. This suggests that PPO from bananas can indeed reduce flavanol absorption.
How Polyphenol Oxidase Works
Polyphenol oxidase is an enzyme that catalyzes the oxidation of polyphenols, breaking them down. When you blend bananas with blueberries, the enzyme is released and can act on the polyphenols in the berries. This reaction can reduce the amount of antioxidants available for your body to absorb.
Should You Stop Eating Banana Blueberry Smoothies?
Not necessarily. While the study shows a reduction in flavanol absorption, it doesn't mean the smoothie is unhealthy. Blueberries still provide fiber, vitamins, and other phytonutrients. Bananas add potassium, vitamin B6, and natural sweetness. The overall health impact of your diet depends on many factors.
Comparison of Antioxidant Levels
| Smoothie Type | Flavanol Absorption | Other Nutrients |
|---|---|---|
| Blueberry + Banana | Lower | High in potassium, vitamin C, fiber |
| Mixed Berry | Higher | High in vitamin C, fiber, various antioxidants |
Key Takeaways
- Bananas contain polyphenol oxidase, which can break down polyphenols in blueberries.
- Studies show that combining bananas with blueberries may reduce flavanol absorption.
- However, the smoothie still offers many nutrients and can be part of a healthy diet.
- If you're aiming to maximize antioxidant intake, consider eating them separately.
FAQ
Does banana really kill the benefits of blueberries?
Does banana really kill the benefits of blueberries?
It can reduce the absorption of certain polyphenols called flavanols, but it doesn't eliminate all benefits. Blueberries still provide other nutrients.
Should I avoid eating bananas and blueberries together?
Should I avoid eating bananas and blueberries together?
Not necessarily. If you enjoy the combination, it's still a healthy choice. If you want to maximize flavanol intake, eat them separately.
What is polyphenol oxidase?
What is polyphenol oxidase?
Polyphenol oxidase is an enzyme found in plants, including bananas, that breaks down polyphenols.
In conclusion, while bananas may reduce the absorption of certain antioxidants from blueberries, the combination is not harmful. Enjoy your smoothie, but if you're after maximum polyphenols, consider separating them.
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