A new study found a blood-based signature linked to a 23% lower risk of death in people with metabolic patterns similar to Mediterranean-style eating.
What the Study Found
The research analyzed 67 metabolites in blood—mostly fat-related molecules—produced as the body breaks down food.
Participants with higher scores on this signature had a 23% lower risk of death over time, even after adjusting for age, smoking, BMI, and health conditions.
The finding was consistent in both a Spanish cohort and a U.S. group, showing a strong link between the blood signature and long-term survival.
How the Signature Works
When food is eaten, the body turns it into small molecules called metabolites.
These metabolites circulate in the blood and show what people eat and how their bodies process it.
Some metabolites match those in olive oil. Others match long-chain fats in nuts and fatty fish—core elements of the Mediterranean diet.
Earlier studies linked this pattern to lower cardiovascular disease risk. This new study shows it may also protect against death years later.
Key Research Details
- People in the highest third of the signature score had a 23% lower risk of death than those in the lowest third.
- Additional data came from 12,704 U.S. participants followed for an average of 25 years.
- Participants in the top fifth of the score also had a 23% lower risk of death, showing consistency across groups.
- The signature was measured at baseline and after one year of the trial.
- Baseline and one-year scores were linked to mortality, but changes over that year were not statistically significant.
This suggests the signature reflects long-term eating habits, not short-term changes.
Why This Matters
Traditional diet questionnaires rely on memory and personal recall.
People often misremember or misreport what they eat, leading to inaccurate data.
A blood-based signature offers an objective, biological record of how food is processed in the body.
It could help doctors identify individuals who benefit most from personalized dietary changes.
Limitations and Open Questions
The study is observational. It shows a link, not a cause.
It cannot prove that improving the signature would extend life.
The U.S. group included mostly white health professionals who were generally healthy.
This limits how broadly the findings apply—especially to diverse populations and those with different health conditions.
More research is needed to show whether this signature adds value beyond known risk factors like age or blood pressure.
Before it becomes a routine test, it must be tested in diverse groups and across different ages and health levels.
What to Watch Next
Researchers plan to include more diverse populations—such as people from different racial and ethnic backgrounds and those with varying metabolic health.
They also aim to test whether specific dietary changes can shift the blood signature over time.
This would support using the test in personalized nutrition and preventive care.
The research was published in The American Journal of Clinical Nutrition.
This article was fact-checked by Rebecca Dyer and edited by Rebecca Dyer. If you spot a mistake, please let us know.
Sources & further reading
Featured image: Scientists Found a Blood Signature Linked to 23% Lower Risk of Death. Via original publisher. Image source
