Plant-Based Diet May Reduce Cryptogenic Stroke Risk in Young Adults

Among 538 young adults who suffered a first-ever cryptogenic ischemic stroke, those eating the least plant-based diet faced 53% higher odds of the event compared with peers who closely followed a Mediterranean pattern, HCPLive reported. The median age of the stroke patients was just 41, with an interquartile range of 34 to 46, and 47.2% were women.

Cryptogenic ischemic stroke—CIS—is the frustrating diagnosis given when doctors cannot pinpoint a cause, a situation common in early-onset cases. Because the etiology of these strokes in younger people is largely undetermined, researchers have historically struggled to identify modifiable risk factors. Kutal and colleagues set out to test whether dietary habits might fill that gap, presenting their findings at the World Stroke Congress in Seoul, South Korea, held October 21–23, 2026.

The team enrolled 538 patients aged 18 to 49 with a first-ever CIS and matched them with 538 stroke-free controls from 19 European centers, HCPLive reported. Using a comprehensive questionnaire and latent profile analyses based on the Mediterranean Diet Score, they sorted the 1,076 participants into three distinct eating patterns.

Adherence to Plant-Based Mediterranean Diet May Reduce Cryptogenic Stroke Risk — Photo: diningandcooking.com

Three Diets, One Clear Signal

The high-adherence group, 289 people with a mean Mediterranean Diet Score of 30.9, served as the reference. The largest group, 573 patients, fell into a low plant-based profile marked by the lowest vegetable and fruit intake and a mean score of 23.7. A smaller meat-heavy group of 142 had the highest meat intake and a mean score of 23.8.

After adjusting for educational level, age, and both traditional and non-traditional risk factors, the low plant-based group showed a statistically significant association with higher CIS risk: an odds ratio of 1.53, with a 95% confidence interval of 1.01 to 2.31. The meat-heavy profile, by contrast, showed no substantial association with stroke risk.

Adherence to Plant-Based Mediterranean Diet May Reduce Cryptogenic Stroke Risk

Why the Plant Gap Matters More Than the Meat

The contrast between the low plant-based and meat-heavy groups is the study’s most telling detail. Both had nearly identical overall Mediterranean Diet Scores—23.7 versus 23.8—yet only the one lacking vegetables and fruits carried elevated risk. That suggests it is the absence of plant foods, rather than the sheer presence of meat, that drives the association in this young population.

The Mediterranean diet itself is characterized by high intake of fruits, vegetables, whole grains, legumes, nuts, olive oil, and fish, with an emphasis on monounsaturated fats and minimal red meat, according to research published in Geroscience. Stroke remains a leading cause of death and disability in the United States, accounting for roughly 1 in every 19 deaths and striking about 795,000 Americans each year, with nearly 610,000 of those being first or new strokes. Nearly 7 million American adults live with the aftermath of stroke, and in Europe, more than 1 million strokes occur annually at an estimated cost of €45 billion.

Traditionally, the primary stroke risk factors have included hypertension, smoking, and diabetes. But as the population ages, the burden grows: stroke is the fifth leading cause of death in the USA, and in Europe it is the second leading cause of death and a leading cause of adult disability. Some research even suggests the protective effects of the Mediterranean diet may vary by sex, with women potentially experiencing greater anti-inflammatory benefits during postmenopause.

The Biomarker Hunt

Kutal sees potential in using dietary patterns as an objective marker for future research.

“We have validated questionnaires and other measures, but it would be very interesting to have some type of a biomarker that would represent some type of dietary quality, and then studies based on following that,” Kutal said. “It would provide a more objective view towards the health risk of dietary habits.”

Such a biomarker could help clinicians move beyond self-reported questionnaires, though Kutal emphasized that further research must support these results before dietary patterns can serve as reliable predictors of stroke risk.

What the Study Does Not Prove

As a case-control study, the research shows association, not causation. The confidence interval for the low plant-based group, 1.01 to 2.31, sits close to the threshold of no effect, meaning the true elevation in risk could be modest. The study also relied on dietary questionnaires, which can misclassify actual intake, and it did not establish whether changing diet after a stroke would alter future risk in these young patients.

Still, for the 538 young patients in the study—people in their 30s and 40s facing a stroke with no clear explanation—the data points to a modifiable factor they can actually influence. The next step, Kutal suggested, is developing that objective biomarker to track dietary quality over time, turning what people eat into measurable data that could one day guide prevention for the next generation of young stroke patients.