You’re making smoothies WRONG! Scientists say never add banana,
Smoothies are a quick and easy way to load up on your five–a–day.
But it turns out you’ve probably been making them wrong.
That’s according to scientists from the University of California, Davis, who have warned that some ingredient combinations may not be as healthy as they seem.
In their study, the team analysed how different fruits blended together can change how much nutrition your body actually absorbs.
Their results revealed that adding a banana to your smoothie may drastically reduce the absorption of flavanols.
These natural plant compounds act like antioxidants, and have been shown to boost both heart and brain health.
‘We were really surprised to see how quickly adding a single banana decreased the level of flavanols in the smoothie and the levels of flavanol absorbed in the body,’ said Javier Ottaviani, lead author of the study.
‘This highlights how food preparation and combinations can affect the absorption of dietary compounds in foods.’
Flavanols are part of a larger group of plant nutrients called polyphenols and are known for supporting heart and brain health.
Previous studies have shown that they are abundant in several foods, including apples, pears, blueberries, blackberries, grapes, and cocoa.
However, until now, it has been unclear whether or not mixing these ingredients with other fruits affects the body’s ability to take in the bioactive compounds.
‘We sought to understand, on a very practical level, how a common food and food preparation like a banana–based smoothie could affect the availability of flavanols to be absorbed after intake,’ Dr Ottaviani explained.
The researchers gave participants a flavanol capsule, before asking them to drink a smoothie made with either banana or berries.
Afterwards, the team measured the levels of flavanol in both their blood and urine.
The results revealed that the people who drank the banana smoothie had 84 per cent lower flavanol levels.
According to the researchers, this effect is linked to an enzyme called polyphenol oxidase (PPO).
PPO is not only responsible for the browning we see in bananas once they’re peeled, but also affects the body’s ability to absorb flavanols.
Based on the findings, the researchers suggest replacing bananas with ingredients that contain low PPO – including pineapple, oranges, mango, or yoghurt.
However, if your morning beverage just isn’t complete without banana, they say it’s best not to mix them with flavanol–heavy foods.
Writing in their study, published in Food & Function, the researchers concluded: ‘This study highlights that consideration needs to be given not only to the types of fruits and vegetables and plant–based products to recommend to increase intake, but also how they are prepared, stored, and consumed as part of a regular meal in order to maximize their potential to support health.
‘Currently, there is a dearth of information on the topic.’



