Produce picks matter: dietary guidelines miss cardioprotective flavanols

Clinical takeaway: Meeting fruit-and-vegetable guidelines doesn't ensure the flavanol intake tied to better cardiovascular health; steering patients toward foods naturally high in flavanols may help.

Clinicians routinely tell patients that eating five or more fruits and vegetables daily is good for their heart health. Flavanols, the plant compounds concentrated in produce, tea, and cocoa, are one reason why: a daily intake of around 500 mg has been linked to lower cardiovascular mortality.

A 2022 Academy of Nutrition and Dietetics guideline recommends 400 to 600 mg per day for cardiometabolic benefit. But whether standard healthy-eating advice actually delivers flavanols at that level hadn't been tested with objective measures. The answer, drawn from biomarker measurements in two large cohorts rather than self-report, was largely no.

Across both cohorts, only about one in five participants reached a flavanol intake of at least 500 mg/day, and that figure barely budged among the guideline-adherent. Intake was measured through validated urinary biomarkers capturing different windows after consumption.

In the US cohort, participants in the top quartile of fruit and vegetable intake hit the threshold just 21% of the time, against 19% for the cohort overall. Diet quality showed a real but modest signal: the highest-quality eaters had 26% higher odds of reaching the threshold, the only produce-related measure that reached significance.

The UK pattern was, if anything, the reverse. The best adherents to fruit and vegetable guidance were the least likely to hit 500 mg/day. Tea, not produce, drove flavanol intake there, reflecting much higher UK tea consumption, though even among the heaviest tea drinkers only about 19% reached the threshold. The US analysis is post hoc, drawn from pre-randomization data; UK data is observational.

Choosing five produce portions at random, or weighted toward what Americans typically eat, rarely reaches 500 mg/day; prioritizing high-flavanol foods raised the odds but still left them under 50%. The reason is concentration: flavanols cluster in a narrow set of foods and vary widely even within them.

The densest sources carry about: 450 mg in four or five plums, 300 mg in a cup of cranberries, 250 mg in a cup of blackberries, and roughly 200 mg in a single cup of green tea. Broad beans and cherries land near 130 to 140 mg per serving, a small handful of beans or about a cup of cherries; an apple with skin runs around 110 mg, and berries like strawberries and blueberries closer to 80 to 90 mg per cup. Most everyday produce contributes little.

"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," said Javier Ottaviani, PhD, the study's lead author and a researcher at Mars Inc. and the University of California, Davis. The work was funded by Mars Inc., which conducts flavanol research and sells flavanol products, and two authors are Mars employees.

Source: Ottaviani JI. Food Funct. 2026 Jun 8. Adhering to dietary guidelines does not yield flavanol intake levels associated with beneficial cardiovascular effects