Think you're eating healthy? You may be missing this heart-protecting nutrient
University of Reading
A large international study found that fewer than one in five people consume enough flavanols, compounds associated with a lower risk of heart disease. Credit: Shutterstock
Adding foods like blueberries, plums, blackberries, broad
beans, and cherries to your daily diet, especially when paired with green tea,
could be a simple way to support heart health, according to new research.
A large international study led by scientists from the
University of Reading, Harvard Medical School, the University of California
Davis, and Mars, Inc., found that most people are not consuming enough
flavanols, natural compounds linked to a lower risk of heart disease.
The researchers discovered that fewer than 20% of people
reached the flavanol intake level associated with heart health benefits. Even
many individuals who regularly ate the recommended five daily servings of
fruits and vegetables failed to meet that target.
Published on June 8, 2026, in the journal Food and
Function, the study analyzed dietary data from more than 30,000 people in
the United Kingdom and the United States using biomarker measurements to assess
flavanol intake.
Most People Fall Short on Flavanols
Dr. Javier Ottaviani, the study's lead author, said:
"Flavanols can significantly reduce the risk of dying from cardiovascular
disease, but only if you consume enough of them. Most people assume that eating
plenty of fruit and vegetables covers this, but what this research shows is
that the specific choices you make matter far more than the total amount.
Including a handful of blackberries, a whole apple or having a cup of green tea
alongside your meal could make a real difference to how much of these beneficial
compounds you actually consume and absorb from the diet."
The findings suggest that simply increasing fruit and
vegetable intake may not be enough. The specific foods people choose appear to
play an important role in determining how many flavanols they actually consume.
Foods Highest in Heart Healthy Flavanols
Earlier research, including the COSMOS study, the largest
clinical trial to examine flavanols, found that consuming 500 milligrams of
flavanols per day significantly lowered the risk of death from heart disease.
The new study indicates that most people remain well below
that level, even when following standard healthy eating recommendations such as
the NHS Eatwell Guide.
Researchers identified the following foods as some of the
richest dietary sources of flavanols per serving:
- Plums
(500g, roughly one punnet): ~450mg of flavanols
- Cranberries
(250g, roughly one punnet): ~300mg of flavanols
- Blackberries
(200g, roughly one punnet): ~250mg of flavanols
- Green
tea (one 250ml cup): ~200mg of flavanols
- Broad
beans/fava beans (80g, a small handful): ~140mg of flavanols
- Cherries
(400g, roughly one punnet): ~130mg of flavanols
- Apples
with skin (200g, one medium apple): ~110mg of flavanols
- Strawberries
(200g, roughly one punnet): ~90mg of flavanols
- Blueberries
(150g, roughly one punnet): ~80mg of flavanols
- Pinto
beans (40g, two tablespoons dry): ~70mg of flavanols
Could Dietary Guidelines Be Improved?
The results also raise questions about whether current
nutrition recommendations could do a better job of helping people obtain
beneficial compounds such as flavanols.
Professor Gunter Kuhnle of the University of Reading said:
"Five-a-day is the right message, but we may need to think more carefully
about which five. Different fruits and vegetables offer very different
nutritional benefits beyond vitamins and minerals, and as our understanding of
these compounds grows, there is a real opportunity to make dietary guidance
more specific and more effective. This research is a step towards understanding
what that might look like in practice."
The researchers say the findings highlight an important
point. While eating plenty of fruits and vegetables remains a cornerstone of a
healthy diet, the types of produce chosen may have a significant impact on
heart health benefits.
Journal Reference:
- Javier
I. Ottaviani, John W. Erdman, Francene M. Steinberg, JoAnn E. Manson,
Howard D. Sesso, Hagen Schroeter, Gunter G. C. Kuhnle. Adhering to
dietary guidelines does not yield flavanol intake levels associated with
beneficial cardiovascular effects. Food, 2026; DOI: 10.1039/D6FO00867D













