Mediterranean Diet Boosts Heart, Brain Health Signals

Study links diet to higher levels of protective mitochondrial microproteins

Mar. 24, 2026 at 6:34am

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A new study led by researchers at the USC Leonard Davis School of Gerontology suggests that the benefits of the Mediterranean diet may be driven, in part, by tiny proteins hidden within our mitochondria, opening a new window into how diet shapes aging and disease risk. The study found that people who closely follow a Mediterranean-style diet have higher levels of two mitochondrial microproteins, humanin and SHMOOSE, which have been linked to protection against cardiovascular disease and neurodegeneration.

Why it matters

The Mediterranean diet, rich in olive oil, fish, legumes, fruits and vegetables, has long been associated with lower risk of heart disease, diabetes and cognitive decline, but the mechanisms behind these benefits are still being uncovered. This study provides new insights into how specific components of the Mediterranean diet may directly influence mitochondrial biology and cellular function, potentially serving as biomarkers for adherence to the diet and having clinical significance.

The details

Researchers analyzed blood samples from older adults and found that those with the highest adherence to the Mediterranean diet showed significantly elevated levels of humanin and SHMOOSE, along with lower markers of oxidative stress. Specific foods like olive oil, fish and legumes were associated with higher humanin levels, while olive oil and lower intake of refined carbs were linked to higher SHMOOSE. The study also found that humanin may help reduce oxidative stress and protect the cardiovascular system by interacting with the enzyme Nox2.

  • The study was published on March 9, 2026.

The players

Roberto Vicinanza

USC Leonard Davis Instructional Associate Professor of Gerontology and lead author of the study.

Pinchas Cohen

USC Leonard Davis School Dean, USC Distinguished Professor, and senior author of the study.

Junxiang Wan

Coauthor of the study from the USC Leonard Davis School.

Kelvin Yen

Coauthor of the study from the USC Leonard Davis School.

Vittoria Cammisotto

Coauthor of the study from Sapienza University of Rome.

Francesco Violi

Coauthor of the study from Sapienza University of Rome.

Pasquale Pignatelli

Coauthor of the study from Sapienza University of Rome.

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What they’re saying

“These microproteins may act as molecular messengers that translate what we eat into how our cells function and age. It's a new biological pathway that helps explain why the Mediterranean diet is so powerful.”

— Roberto Vicinanza, USC Leonard Davis Instructional Associate Professor of Gerontology

“These peptides are emerging as key regulators of aging biology. They connect mitochondrial function to diseases like Alzheimer's and heart disease and now, potentially, to nutrition.”

— Pinchas Cohen, USC Leonard Davis School Dean and USC Distinguished Professor

“This could represent a new cardioprotective mechanism of the Mediterranean diet.”

— Roberto Vicinanza, USC Leonard Davis Instructional Associate Professor of Gerontology

What’s next

Future research will explore whether dietary interventions can directly increase levels of humanin, SHMOOSE and related peptides and whether those changes translate into reduced disease risk.

The takeaway

This study provides new insights into how the Mediterranean diet, with its emphasis on whole, minimally processed foods, may promote healthy aging at the molecular level by influencing mitochondrial microproteins that are emerging as key regulators of cardiovascular and neurological health.