Popular smoothie ingredient may reduce one key health benefit, study suggests

Bananas are a smoothie staple, but a viral social media video has raised questions about whether they could reduce the nutritional benefits of other ingredients, such as blueberries.

In a July appearance on the "Mel Robbins Podcast," Dr. Rhonda Patrick, a biomedical scientist and founder of FoundMyFitness, demonstrated how she likes to make her smoothies, which do not include banana.

Bananas contain polyphenol oxidase (PPO), an enzyme that can break down polyphenols, which are beneficial for gut...