The Portfolio Diet Tracked With Slightly Fewer Heart Disease Deaths

CATEGORY: EATING FOR HEART HEALTH

The “Portfolio diet“ is closer to a shopping list than a regimen: nuts, beans and other plant proteins, oats and barley, plant sterols, and plant-based oils. Among nearly 15,000 U.S. adults followed for about two decades, the people whose everyday eating most closely resembled that list were about 16% less likely to die from cardiovascular disease than the people whose eating resembled it least.¹ Cardiovascular disease covers conditions of the heart and blood vessels, including heart attacks and strokes. No one was put on this way of eating by a researcher, so the finding is a link and not proof the diet caused the lower death rate.

Five Plant Components, All Aimed at Cholesterol

The pattern is a specific combination studied for its effect on cholesterol, a fatty substance in your blood that can build up in artery walls. Five parts make it up. There are nuts; plant protein such as beans, lentils and soy foods like tofu; and foods rich in viscous fiber, the sticky, gel-forming fiber in oats and barley that helps sweep cholesterol out of the body. The last two are foods containing plant sterols, natural plant compounds that block some cholesterol from being absorbed, and plant sources of monounsaturated fat, the heart-friendly fat in olive and other plant oils. Each part nudges cholesterol down a little. The premise is that together they add up to more than any single food manages alone.

14,835 Adults, 22 Years, 6,238 Deaths

Researchers drew on a large national health survey that recorded what 14,835 American adults ate, using a detailed interview about the previous day’s food plus a questionnaire about how often they ate various items. Each person received a Portfolio Diet Score reflecting how far their eating included the beneficial components and limited foods high in saturated fat and cholesterol. Participants were then sorted into three roughly equal groups: highest, middle and lowest adherence. Their records were linked to the National Death Index, a registry of death certificates, through the end of 2019. Over an average of about 22 years, the researchers counted 2,300 deaths from cardiovascular disease and 6,238 deaths from all causes, then compared rates across the three groups while accounting for factors such as age, smoking and physical activity.¹ Those cardiovascular deaths included 1,887 from coronary heart disease and 413 from stroke.¹

16% Lower Cardiovascular Death, 14% Lower Overall

The closest-match group had a 16% lower rate of death from cardiovascular disease than the group whose diets resembled the pattern least.¹ That same top group also had a 14% lower rate of death from any cause. The link held for coronary heart disease specifically, the kind caused by narrowed heart arteries. These are relative differences between groups rather than guarantees for any individual, and the size of the effect was modest. What strengthens it is that several different outcomes pointed the same way.

210,000 Health Professionals, Followed Up to 30 Years

Cholesterol is the thread tying these foods together. Viscous fiber and plant sterols each interfere with how much of it the body absorbs, nuts and plant oils supply fats that tend to be gentler on the arteries than saturated fat, and swapping in plant proteins usually means less animal fat alongside. None of this describes a restrictive way of eating. The study looked at ordinary diets and asked only how far they leaned toward these plant foods. What it cannot tell us is whether people who ate this way were also healthier in ways the researchers could not fully measure, which is the standing limitation of observational work. A separate effort followed about 210,000 U.S. nurses and health professionals for up to 30 years. The highest scorers on the same pattern had a 14% lower risk of developing cardiovascular disease, and a 14% lower stroke risk, than the lowest scorers.² That work was observational as well.

Key Takeaways

• Closer adherence to the Portfolio pattern, built from nuts, plant proteins, oats and barley, plant sterols and plant oils, was associated with about a 16% lower rate of cardiovascular death and a 14% lower rate of death from any cause across roughly 22 years of follow-up.
• Eating habits were reported by the participants and observed rather than assigned, so the study shows an association rather than proof that the diet produced the lower risk.

References

1. Kavanagh ME, Zurbau A, Glenn AJ, et al. The portfolio dietary pattern and risk of cardiovascular disease mortality during 1988–2019 in US adults: a prospective cohort study. BMC Medicine. 2025;23:287. link
2. Glenn AJ, Guasch-Ferré M, Malik VS, et al. Portfolio diet score and risk of cardiovascular disease: findings from 3 prospective cohort studies. Circulation. 2023;148(22):1750–1763. link.