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A study of older adults found that those whose eating patterns more closely matched the Mediterranean diet had higher blood levels of the mitochondrial microproteins humanin and SHMOOSE, along with lower indicators of oxidative stress. The findings suggest a possible biological link, but do not show that the diet caused the changes or that the proteins prevent heart or brain disease.
A study of older adults found that those who followed the Mediterranean diet more closely had higher blood levels of two tiny proteins produced by mitochondria, humanin and SHMOOSE. The USC-led research also found lower indicators of oxidative stress in this group, suggesting a possible cellular pathway behind the diet’s reported health associations—but the study does not establish that eating this way caused the changes or prevents disease.
Researchers at the USC Leonard Davis School of Gerontology examined blood samples from older adults whose diets differed in how closely they matched a Mediterranean eating pattern. Participants with closer adherence had significantly higher concentrations of humanin and SHMOOSE, according to the study report. They also had lower indicators of oxidative stress, a process in which reactive oxygen species outnumber the body’s defenses and can damage cellular components.
The researchers reported different food associations for the two proteins. Higher intake of olive oil, fish and legumes was linked with increased humanin levels. Olive oil consumption and lower consumption of refined carbohydrates were associated with higher SHMOOSE levels. These are reported associations, not evidence that any one food directly raises a protein or that changing a diet will produce a particular health outcome.
The study was led by Roberto Vicinanza, an instructional associate professor of gerontology at USC, with USC Leonard Davis School Dean Pinchas Cohen as senior author. The report describes the findings as a possible explanation for how food choices relate to cellular health. It does not provide, in the supplied account, details such as the sample size, the length of dietary measurement or the size of the protein differences.
A Possible Link Between Diet and Cell Stress
The results may help researchers investigate how dietary patterns relate to biology, rather than relying only on observed links between diets and disease outcomes. Humanin and SHMOOSE are being studied as mitochondrial signals involved in cellular processes, while oxidative stress is one pathway associated with cellular damage. A relationship among diet, these proteins and stress indicators could help guide future research into aging and cardiovascular or brain health.
For readers, the finding is not a new clinical recommendation and does not show that the proteins protect an individual’s heart or brain. The study is an early step toward understanding a potential mechanism. The Mediterranean diet has been associated with lower risks of heart disease, type 2 diabetes and cognitive decline in previous research, but this report does not establish that humanin or SHMOOSE explains those associations.
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What Humanin and SHMOOSE Do
Mitochondria produce much of the energy cells use, but they also take part in metabolism and cellular stress responses. The microproteins in this study are made from short genetic sequences in mitochondrial DNA. Researchers have increasingly examined these molecules as possible regulators of cell function and aging, although their roles are still under study.
Humanin was identified in 2003 by Cohen and colleagues. Earlier research has associated it with insulin sensitivity, cardiovascular health, longevity and cognitive function; those findings do not mean the current diet study tested or confirmed those effects. SHMOOSE was identified more recently. A genetic variant has been associated with increased Alzheimer’s disease risk, while laboratory research has suggested the usual form may help protect neurons from amyloid-related damage.
The Mediterranean diet generally emphasizes olive oil, fish, beans, lentils, fruits and vegetables. The USC report places the new findings within a broader effort to understand why this eating pattern has been linked with health outcomes. It does not describe a clinical trial in which participants were assigned to change their diets.
Questions About Cause and Clinical Value
The reported findings do not establish cause and effect. People who followed the diet more closely had higher protein levels, but the account does not show that dietary changes produced those levels or rule out other explanations. The sample size, study duration, participant characteristics and adjustments for other factors are not provided in the supplied report.
It is also unclear whether higher levels of humanin or SHMOOSE translate into meaningful reductions in heart disease, cognitive decline or other illness. The researchers propose that the proteins could be biomarkers of diet adherence, but their accuracy and clinical usefulness have not been established here. The supplied report ends while describing a possible connection between humanin and the enzyme Nox2, which generates reactive oxygen species; it does not provide enough detail to assess that result.
Further Studies Must Test the Link
Next research would need to test whether dietary changes lead to changes in humanin, SHMOOSE and oxidative-stress measures, ideally with clear reporting of participant numbers, follow-up periods and relevant health outcomes. Researchers would also need to determine whether protein levels can reliably indicate eating patterns and whether they add information beyond established measures.
Until those questions are answered, the findings should be read as a possible biological connection, not proof that the diet boosts protective proteins or that the proteins prevent disease. The study report does not identify a planned follow-up date or a next clinical milestone.
Key Questions
What did the study find?
Older adults whose diets more closely matched the Mediterranean pattern had higher blood concentrations of humanin and SHMOOSE and lower indicators of oxidative stress, according to the report.
Does the study prove the Mediterranean diet raises these proteins?
No. It reports an association between diet adherence and protein levels. The supplied account does not establish that the diet caused the differences.
What are humanin and SHMOOSE?
They are small proteins produced from genetic instructions in mitochondria. Researchers are studying their possible roles in cellular health, aging and disease-related processes.
Does this mean the proteins protect people from heart disease or Alzheimer’s?
No such clinical effect was demonstrated in this study. Earlier research has linked the proteins to health-related processes, but this report does not show that higher levels prevent heart or brain disease.
Which foods were associated with higher protein levels?
Olive oil, fish and legumes were associated with higher humanin levels. Olive oil and lower refined-carbohydrate intake were associated with higher SHMOOSE levels. These findings do not prove that the foods directly caused the changes.
Source: rss
