Eating five servings of fruit and vegetables a day may fall short of protecting heart health if those choices are low in flavanols, according to research that is reshaping how nutrition scientists discuss dietary variety. Flavanols are a group of plant compounds found in berries, apples, tea, cocoa, and certain vegetables that have been linked to improved cardiovascular function across multiple studies.

The research suggests that people following standard dietary guidelines could still be missing meaningful heart benefits simply by selecting flavanol-poor produce. A diet heavy in lettuce, carrots, and bananas might hit the five-a-day target on paper while delivering very little of the compounds that appear to have specific protective effects on blood vessel function and inflammation markers.

Scientists studying flavanols have pointed to their role in relaxing blood vessels and reducing blood pressure as the key mechanism. Earlier work published in medical journals found that regular cocoa flavanol consumption produced measurable reductions in cardiovascular risk among older adults, a finding that has driven broader interest in the category. Blueberries, blackberries, green and black tea, apples, and dark chocolate rank among the richest flavanol sources.

The practical takeaway for most people is to think about the composition of their daily fruit and vegetable intake, not just the quantity. Choosing a varied selection that includes at least some high-flavanol options each day appears to offer benefits that a higher volume of low-flavanol produce cannot replicate.

Nutrition researchers caution that no single dietary intervention addresses all cardiovascular risk factors. Blood pressure, physical activity, sleep, and other factors remain important alongside diet. But the flavanol findings add a specific layer to the conversation about what a protective diet actually contains, one that standard guidelines have not always made explicit.

The research has prompted some scientists to call for more detailed guidance on food quality within the five-a-day framework. Rather than counting portions, they argue, consumers would benefit from understanding which specific foods within that category deliver the most measurable cardiovascular benefit. Information on heart-healthy eating patterns is available from the World Health Organization. Strength training and non-surgical joint treatments are among other health topics drawing new research attention this summer. The FDA’s recent decisions on sunscreen ingredients are part of a broader wave of updates to consumer health guidance.