Understanding Healthy Eating
We often hear the phrase “eat healthy,” but what does it really entail?
Even medical professionals can find it challenging to provide clear, actionable advice regarding specific foods that contribute to good health, including their effects and potential benefits.
Recent studies are beginning to shed light on this issue. Along with my colleagues, I looked into a variety of plant compounds known as flavan-3-ols and their potential role in lowering blood pressure and enhancing the function of blood vessels.
The findings indicate that these everyday compounds could significantly benefit heart health.
What Are Flavan-3-Ols?
Flavan-3-ols, sometimes referred to as flavanols or catechins, are natural compounds in plants belonging to the flavonoid family. They contribute to the color of plants and help shield them from sunlight and pests.
We find flavan-3-ols in many common foods: cocoa, green and black tea, grapes, apples, and certain berries. That somewhat bitter or tart taste you get from dark chocolate or robust tea? That’s the flavan-3-ols doing their thing.
Researchers have been intrigued by their health benefits for a long time. A notable study conducted in 2022, dubbed the Cosmos trial, observed more than 21,000 individuals and concluded that cocoa flavanols—unlike multivitamin supplements—decreased the risk of dying from cardiovascular diseases by around 27%.
Our research aimed to explore deeper into how these compounds affect blood pressure and endothelial function, which measures how well blood vessels can dilate and manage blood flow.
We analyzed data from 145 randomized controlled trials encompassing over 5,200 participants. These studies examined various flavan-3-ol-rich foods and supplements, including cocoa, tea, grapes, and apples, gauging their impacts on key cardiovascular factors: blood pressure and flow-mediated dilation (FMD), which indicates how effectively blood vessels operate.
The studies ranged from single doses to longer ones, lasting weeks or even months. On average, participants consumed roughly 586 mg of flavan-3-ols daily—equivalent to two or three cups of tea, one or two servings of dark chocolate, two tablespoons of cocoa powder, or a few apples.
Regular intake of flavan-3-ols resulted in an average blood pressure reduction of about 2.8 mmHg systolic and 2.0 mmHg diastolic. For individuals starting out with high blood pressure or hypertension, the reductions were even more significant—up to 6-7 mmHg systolic and 4 mmHg diastolic.
This is comparable to some prescribed blood pressure medications, potentially lowering the risk of heart attacks and strokes.
We found that these compounds also enhance endothelial function, showing an average 1.7% increase in FMD with ongoing intake. This improvement was noted even among those who had normal blood pressure, implying that flavan-3-ols might protect blood vessels in various ways.
Slight side effects were rare and usually mild, mostly involving digestive issues, indicating that incorporating flavan-3-ol-rich foods into your diet is, in general, a safe choice.
Promoting Heart Health
While the advantages were most apparent for those with high blood pressure, individuals with normal readings also experienced improvements in vascular function. This suggests that flavan-3-ols could help prevent cardiovascular issues before they arise.
High blood pressure is a major contributor to heart disease globally, even at levels that don’t meet the threshold for full hypertension. Recent guidelines note that even “elevated” blood pressure levels carry increased risks.
Lifestyle alterations—especially dietary adjustments and regular exercise—are frequently recommended by healthcare providers. However, both patients and practitioners often lack straightforward guidance on which foods truly have an impact.
Our research helps bridge this gap, indicating that increasing flavan-3-ol intake through everyday foods may offer a simple and effective method to enhance cardiovascular health.
Considerations for Supplements
Some studies examined supplements or isolated flavan-3-ol compounds, but these typically yielded smaller effects than whole foods like tea or cocoa. This might be because other beneficial compounds in whole foods work synergistically, making them more effective.
At this point, it seems safer and more beneficial to consume flavan-3-ols through food rather than high-dose supplements, especially for individuals on medications, as the interactions can be unclear.
The studies we reviewed suggest that around 500-600 mg of flavan-3-ols daily could be sufficient for benefits. You could achieve this by combining a few servings of tea, some dark chocolate, cocoa powder, apples, and other fruits rich in flavan-3-ols.
Making small changes in your diet—like swapping a sugary snack for an apple or an extra piece of dark chocolate—can gradually improve heart health. Given that flavan-3-ol levels can fluctuate between foods, keeping an eye on your blood pressure may help you pinpoint what works best for you.
More research is needed, particularly among individuals with diabetes, as results there have been less consistent. We also need a better understanding of how flavan-3-ols interact with medications and if combining them with other healthy practices could yield greater benefits.
Nonetheless, the evidence is strong enough to advocate for adding flavan-3-ol-rich foods to a heart-healthy diet. As healthcare professionals look for practical, affordable lifestyle changes for patients, these findings support the potential of using food as a form of preventive care.
Of course, flavan-3-ols aren’t a cure-all. They won’t replace prescribed medications for everyone. But when combined with other healthy habits, they could provide a valuable—and tasty—enhancement to cardiovascular well-being.
And, unlike many current health trends, this isn’t about pricey superfoods or obscure supplements. It centers on foods we often enjoy, just used with a bit more intention.
