Mediterranean Diet Activates Anti-Aging Microproteins
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- USC researchers found older adults who most closely followed the Mediterranean diet had significantly higher blood levels of mitochondrial microproteins humanin and SHMOOSE, both previously associated with cardiovascular and neurodegenerative protection.
- Olive oil, fish, and legumes individually tracked with higher humanin, while olive oil combined with lower refined-carb intake was linked to higher SHMOOSE — evidence the diet's components act on different microproteins.
- Higher humanin levels were associated with reduced activity of Nox2, an enzyme that produces reactive oxygen species, suggesting the diet may shield the cardiovascular system through a second pathway beyond simply lowering oxidative stress.
- Lead researcher Roberto Vicinanza called humanin and SHMOOSE "molecular messengers that translate what we eat into how our cells function and age," framing the finding as a new biological pathway explaining the diet's known benefits.
- Senior author Pinchas Cohen first identified humanin in 2003 and later discovered SHMOOSE; one SHMOOSE genetic variant is tied to higher Alzheimer's risk, while the normal form appears to shield neurons from amyloid-related damage.
- The study, published March 9, 2026 in Frontiers in Nutrition, was observational and relatively small — meaning it shows association rather than causation, and researchers say future trials must test whether dietary changes directly raise these microproteins.
Why it matters: The finding gives researchers two candidate blood-based biomarkers — humanin and SHMOOSE — to measure whether a person's biology is actually responding to a Mediterranean eating pattern, a concrete step toward the precision-nutrition field. But with only observational data from a small cohort, Cohen's team still faces the harder task of running intervention trials to prove diet changes directly lift those microprotein levels.
