Air pollution linked to more body fat in a Spanish study group
Each unit increase in black carbon exposure was linked to 0.74 kg less lean mass, the body’s nonfat tissue, at enrollment.
Our read
Populations- Studied:
- Cohort study of 1,454 adults with overweight or obesity and metabolic syndrome, 3 years
- What changed:
- Body fat percentage was 1.01% higher per 1 × 10-5/m increase in black carbon
- The catch:
- Highly correlated pollutants were difficult to separate
- In the record:
- The 33rd paper on black carbon with results in people; 82 on record in all.
- Why it’s aging research:
- It bears on staying healthy in midlife and later life.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational study examined 1,454 adults in Spain with overweight or obesity and metabolic syndrome, a cluster of conditions that raises diabetes and heart disease risk. Men were aged 54–75 and women 60–75; 48% were female. Participants came from a randomized lifestyle trial, but this analysis did not assign pollution exposure.
Researchers estimated annual pollution exposure at participants’ home addresses. Scans measured body composition at enrollment and one and three years later. At enrollment, each black carbon exposure increase of 1 × 10⁻⁵ per meter was associated with 1.01 percentage points more body fat and 0.74 kg less lean mass. The links with body fat and lean mass percentages persisted for black carbon and fine particulate matter at years one and three. Nitrogen dioxide showed similar links at enrollment.
Why it matters
For older adults already at metabolic risk, the study points to air pollution as a possible factor to consider when studying changes in fat and lean tissue.
Caveats
This observational analysis cannot show that pollution caused the differences, and highly correlated pollutants were difficult to separate. The findings concern adults with overweight or obesity and metabolic syndrome, not the general population.
The paper
Instituto de Salud Carlos III
Diabetes Care, Apr 21, 2026, Open access
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