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Scientists at USC have found a molecular clue behind the Mediterranean diet's well-known health benefits. Older adults who closely followed the diet had higher levels of two mitochondrial microproteins — humanin and SHMOOSE — linked to protection against heart disease and Alzheimer's. The findings hint at a new biological pathway connecting what we eat to how our cells age.
Scientists at USC's Leonard Davis School of Gerontology may have cracked open a new chapter in understanding why the Mediterranean diet is so consistently good for us. A new study found that older adults who most closely followed the diet had significantly higher blood levels of two mitochondrial microproteins — humanin and SHMOOSE — both previously linked to cardiovascular protection and defense against neurodegeneration, including Alzheimer's disease.
The researchers also observed that higher humanin levels were associated with lower activity of Nox2, an enzyme that drives oxidative stress — a process that damages blood vessels and accelerates aging. This suggests the diet may protect the heart through two complementary pathways: directly reducing oxidative stress and boosting microproteins that regulate cellular health.
Key Takeaways:
Why it matters: The study is observational and small, so causality isn't confirmed yet. But if future research shows diet can reliably raise these proteins, it could open the door to precision nutrition strategies tailored to promote healthy aging at the molecular level.
