"Surprising Results: The Fruit Thought to Be Healthy That Reduces Nutrient Absorption by 84% [Experiment Note]"

Flavanol Absorption Drops by 84% in Berry Smoothies with Banana

"Ingredient Combinations Affect Nutrient Absorption"

Editor's NoteOne now, or two if you wait. Do you remember the marshmallow experiment that observed children's choices? Simple research can sometimes change the way we view life. Let's take a fresh look at our daily lives through the lens of experimental data.

With the hot weather quickly arriving, more and more people are seeking out refreshing and tangy smoothies. Among smoothie ingredients, bananas are a staple. They are easy to find, affordable, and add a natural sweetness. Berries such as strawberries or blueberries, especially out of season, can often taste sour, but adding a banana makes the flavor smoother. This is why the combination is considered a way to achieve both health and taste.

However, recent research has revealed an unexpected twist in this familiar combination. It turns out that bananas, often added for health benefits, may actually hinder the absorption of certain nutrients found in berries.

Blueberry smoothie Pixabay

Adding Banana Reduces Blueberry Flavanol Absorption by 84%

A research team at the University of California, Davis (UC Davis) recently published a study in the Royal Society of Chemistry journal "Food & Function," revealing that smoothies containing bananas can significantly reduce the body's absorption of certain plant-based nutrients.

The nutrient in focus was 'flavanol.' Flavanols are plant compounds known to support cardiovascular health and cognitive function. They are abundant in foods such as blueberries, blackberries, grapes, apples, pears, and cocoa.

The issue was 'polyphenol oxidase (PPO),' which is abundant in bananas. PPO is the enzyme responsible for the browning that occurs when an apple is cut or a banana is peeled.

Banana. Pixabay

The researchers prepared smoothies using bananas, which are high in PPO, and berries, which are low in PPO, and had participants consume each. They then measured how much flavanol was absorbed by analyzing blood and urine samples.

The results showed that participants who drank smoothies with banana had flavanol levels 84% lower than the control group. In contrast, those who consumed berry smoothies with low PPO content maintained flavanol absorption at levels similar to the control group.

Javier Ottaviani, the lead researcher, commented, "I was surprised to see how quickly both the flavanol content in the smoothie and its absorption in the body decreased just by adding a single banana," adding, "This demonstrates that the combination of ingredients and the method of preparation can affect nutrient absorption."

"Nutrient Loss Occurs Even When Consumed Separately"

Additional experiments conducted by the research team revealed even more interesting findings. This time, the flavanol and banana drinks were not mixed before consumption—they were consumed separately, not blended like a smoothie. Nevertheless, flavanol levels still decreased. The researchers interpreted this as a sign that the effects of PPO might persist inside the digestive tract.

Bananas are a healthy food, rich in dietary fiber, potassium, and various other nutrients. However, if you want to maximize the effects of flavanol-rich foods such as blueberries, grapes, or cocoa, it may be better to choose ingredients other than bananas.

The researchers suggested that if you want to increase flavanol intake, it is advantageous to combine berries with ingredients that are low in PPO, such as pineapple, orange, mango, or yogurt.

Of course, there are limitations to this study. The first experiment involved eight healthy adult men, and the second involved eleven participants. Since the sample size was small, it is difficult to conclude that the same results would apply to everyone.

In fact, eating healthy ingredients together does not always enhance nutritional benefits. Green tea is a well-known health beverage, but tannins and polyphenols in green tea can bind to iron and inhibit its absorption. For this reason, people taking iron supplements are often advised to space out their intake.

Spinach and anchovies are also not recommended as a combination. Spinach contains oxalic acid, which is known to partially inhibit the absorption of calcium from anchovies.

Some combinations increase nutritional effects, while others may reduce the expected benefits. Just as people have compatibility, so do foods. On a leisurely weekend, why not check the compatibility of the ingredients in your refrigerator?

This content was produced with the assistance of AI translation services.