Mediterranean-Style Eating Tracked With Less Heart Disease Than a Low-Fat Diet

CATEGORY: EATING FOR HEART HEALTH

Among more than 12,000 U.S. adults at raised risk of heart disease, those who consistently ate a Mediterranean-style pattern had an estimated 21% lower risk of heart attack, stroke or death from heart disease over 20 years than those who followed a low-fat diet, according to an analysis published in August 2026 in the American Journal of Clinical Nutrition.¹ The American Heart Association’s 2020 food-based dietary goals were also linked to lower risk than the low-fat approach—about 13% lower—landing between the two.

Olive Oil, Nuts, and Fish Versus Low Fat

The low-fat pattern discouraged cooking oils and spreads, nuts, fatty fish, fried snacks and pastries. The Mediterranean pattern (a version adapted to American eating habits) emphasized olive oil, nuts, fish, vegetables, legumes (beans, lentils and peas) and whole grains. The AHA-2020 pattern centered on fruits, vegetables, fish and whole grains while limiting sugary drinks and processed meat. Both patterns that came out ahead are rich in fat; the difference lies in the kind of fat and the foods that carry it.¹

12,197 Adults, Diet Questionnaires Every Four Years

Researchers drew on the Nurses’ Health Study and the Health Professionals Follow-up Study, two long-running U.S. cohorts, focusing on 12,197 adults aged 55 to 80 who had diabetes or at least three major heart-disease risk factors. Participants reported their diet every four years on detailed food questionnaires. Over 20 years, 3,469 developed cardiovascular disease—a non-fatal heart attack, a procedure to reopen blocked heart arteries, a stroke, or death from heart disease—each confirmed against medical records. Because no one was randomly assigned a diet, the team used a technique called target trial emulation: they modeled what would have happened had everyone stuck with each pattern for the whole period, accounting for other habits and health conditions. Think of it as replaying the same 20 years three times with a different menu each time.¹

Eight Fewer Cases per 100 Than Low-Fat Eating

The estimated 20-year risk of cardiovascular disease was 35.9% under the low-fat diet, 31.2% under the AHA-2020 goals and 28.2% under the Mediterranean pattern—roughly eight fewer cases for every 100 people compared with low-fat eating. The advantage showed up for coronary heart disease and cardiovascular death but not clearly for stroke on its own. In a broader group not selected for high risk, the gaps were smaller: about 10% and 6% lower.¹

Self-Reported Diet Among Mostly White Health Professionals

This is an observational study, so it shows an association rather than proof that diet caused the difference; diet was self-reported, and participants were mostly white health professionals. Even so, the direction matches the Spanish PREDIMED randomized trial, in which a Mediterranean diet with extra-virgin olive oil or nuts reduced major heart events by roughly 30%.² Together, the studies suggest that in adults with heart risk factors, what you eat may matter more than how much fat you avoid.

Key Takeaways

• In 12,197 U.S. adults with diabetes or multiple heart risk factors, consistently following a Mediterranean-style pattern was linked to a 21% lower 20-year risk of cardiovascular disease than a low-fat diet; the AHA-2020 goals were linked to a 13% lower risk.
• Estimated 20-year risk was about 28% under Mediterranean eating versus 36% under low-fat eating—roughly eight fewer cases per 100 people.
• The study is observational and modeled from self-reported diet; the benefit was clear for coronary disease and heart-related death but not for stroke alone.

References

1. Li Y, Stern D, Martínez-González MA, et al. Cardiovascular disease risk under low-fat, Mediterranean, and American Heart Association diets: a target trial emulation in United States adults. The American Journal of Clinical Nutrition. 2026;124(2):101404. link
2. Estruch R, Ros E, Salas-Salvadó J, et al. Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts. The New England Journal of Medicine. 2018;378(25):e34. link