A new magnetic resonance imaging study of 1,164 healthy adults has revealed a striking connection between body composition and brain aging. According to research presented by Dr. Somayeh Meysami and colleagues at the Radiological Society of North America 2025 meeting, people with greater skeletal muscle mass showed biologically younger-looking brains, while those with more visceral fat displayed accelerated brain aging patterns.
Body composition’s impact on brain aging
Association strength between tissue types and estimated brain age, study of 1,164 adults
Source: Meysami et al., RSNA 2025 | Georgian Medical Journal News
Visceral fat emerges as key factor in brain aging
The study, which examined participants with an average age of 55 years, used advanced MRI techniques to estimate “brain age” and compared these measurements to detailed body composition analysis. The results showed clear patterns linking metabolically active visceral fat to older-appearing brain structure.
Visceral fat, the deep abdominal fat surrounding internal organs, is known to be metabolically active and associated with inflammation and insulin resistance. This contrasts sharply with subcutaneous fat under the skin, which showed no meaningful association with brain aging in the study. “The findings suggest that not all fat tissue affects the brain equally,” researchers noted in their RSNA presentation.
The research adds to growing evidence that metabolic health markers may be more predictive of cognitive aging than simple weight measurements.
Muscle mass shows protective association
Perhaps more striking was the protective association observed with skeletal muscle mass. Participants with greater muscle mass consistently showed younger brain age estimates, suggesting that muscle tissue may play a crucial role in maintaining cognitive health as we age.
This finding aligns with research published in Neurobiology of Aging that has linked muscle mass to cognitive resilience through multiple pathways, including improved insulin sensitivity and reduced systemic inflammation. Muscle tissue acts as a metabolic buffer, helping regulate blood sugar and producing beneficial signaling molecules.
The clinical implications suggest that preserving muscle mass while reducing visceral fat may be more important for long-term brain health than weight loss alone.
Limitations and future research directions
The researchers emphasized that this was an observational imaging study that demonstrates associations rather than cause-and-effect relationships. The cross-sectional design means that while patterns are clear, the study cannot prove that changing body composition will directly impact brain aging.
Future longitudinal studies will be needed to determine whether interventions targeting muscle preservation and visceral fat reduction can slow brain aging. The research team noted that specific exercise protocols or nutritional interventions were not tested in this analysis, according to findings published by the World Health Organization on physical activity guidelines.
People with greater skeletal muscle mass showed biologically younger-looking brains, while those with more visceral fat displayed accelerated brain aging patterns in MRI analysis.
— Dr. Somayeh Meysami, Radiological Society of North America (RSNA, 2025)
Key takeaways
- Higher muscle mass was associated with younger brain age in 1,164 adults studied with MRI
- Visceral fat showed strong links to accelerated brain aging, while subcutaneous fat had no association
- Body composition may be more predictive of brain health than overall weight measurements
Frequently asked questions
What type of fat is most harmful for brain aging?
Visceral fat, the deep abdominal fat surrounding internal organs, showed the strongest association with accelerated brain aging. This type of fat is metabolically active and linked to inflammation and insulin resistance.
How was brain age measured in this study?
Researchers used advanced MRI imaging techniques to analyze brain structure and estimate biological brain age, comparing it to chronological age. This method has been validated in multiple neuroimaging studies.
Can changing body composition actually slow brain aging?
This study shows associations but cannot prove causation. Future longitudinal research will need to test whether interventions that build muscle and reduce visceral fat can directly impact brain aging patterns.
The findings underscore the complex relationship between metabolic health and cognitive aging, suggesting that maintaining muscle mass and reducing visceral adiposity may represent key targets for promoting brain health throughout the lifespan. As populations age globally, understanding these body-brain connections becomes increasingly critical for developing effective interventions to preserve cognitive function.
Source: Your brain may be aging faster than your body, and muscle appears to matter more than the scale
