We all know that eating fruit is good for us, but researchers have found that a simple bowl of red raspberries can actively improve your cardiovascular health, and the benefits last much longer than you might think.
A study (Istas G, et.al., 2018) published in Archives of Biochemistry and Biophysics looked closely at how our bodies process raspberries, revealing a fascinating link between the fruit, our gut bacteria, and our blood flow.
The Study: Putting Raspberries to the Test
To see how raspberries affect our circulation, researchers set up a highly rigorous, double-blind study. They had 10 healthy men consume three different drinks on separate occasions:
- A drink made from 200 grams of red raspberries (about one cup).
- A drink made from 400 grams of red raspberries (about two cups).
- A matched control drink that tasted the same but contained no actual berry nutrients.
The researchers then tracked the participants’ Flow-Mediated Dilation (FMD) at 2 hours and 24 hours after drinking. FMD is a medical test that measures how well your blood vessels can widen and relax to let blood flow through. Relaxed, flexible blood vessels are a major sign of a healthy cardiovascular system.
The Results: Better Blood Flow, All Day Long
The results were clear: eating raspberries directly improved blood vessel flexibility.
- The 2-Hour Peak: Just two hours after drinking the raspberry blends, participants showed a significant jump in their FMD. The 200-gram dose improved blood vessel dilation by 1.6%, while the 400-gram dose improved it by 1.2% compared to the control group.
- The 24-Hour Stay: Remarkably, the benefits didn’t vanish by the next day. Even 24 hours later, those who drank the raspberry blends still had significantly better blood vessel dilation (1.0% for the 200-gram dose and 0.7% for the 400-gram dose).
Interestingly, the smaller dose (200g, or roughly a standard cup of berries) actually performed slightly better than the larger dose, meaning you don’t have to overindulge to get the maximum benefit.
The Secret Ingredient: Your Gut Bacteria
Why do the heart-healthy effects of raspberries last a full 24 hours? The answer lies in how our bodies digest them.
Raspberries are packed with natural antioxidants called ellagitannins. When you eat them, your body doesn’t absorb them right away. Instead, they travel down to your gut, where your microbiome (the friendly bacteria living in your digestive tract) goes to work breaking them down.
Your gut bacteria convert these antioxidants into compounds called urolithins. The researchers found that the level of these urolithins in the participants’ blood directly matched the improvement in their blood flow 24 hours later.
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The Takeaway
The heart benefits of raspberries are a team effort. You provide the berries, and your gut bacteria transform them into a day-long shield for your blood vessels. Adding a cup of fresh raspberries to your daily routine is a delicious, scientifically backed way to support your circulation.
Reference
Istas G, Feliciano RP, Weber T, Garcia-Villalba R, Tomas-Barberan F, Heiss C, Rodriguez-Mateos A. Plasma urolithin metabolites correlate with improvements in endothelial function after red raspberry consumption: A double-blind randomized controlled trial. Arch Biochem Biophys. 2018 Aug 1;651:43-51. doi: 10.1016/j.abb.2018.05.016. Epub 2018 May 24. PMID: 29802820.
