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More muscle mass combined with lower levels of visceral belly fat is associated with a younger biological brain age, indicating slower brain aging and potentially reduced risk of cognitive decline and dementia, according to recent research using advanced magnetic resonance imaging (MRI) and artificial intelligence (AI) algorithms. This connection suggests maintaining muscle and reducing hidden belly fat could be important for brain health across adulthood.
Key Findings on Muscle Mass and Brain Age
A study presented at the 2025 Radiological Society of North America annual conference analyzed MRI data from over 1,100 healthy adults aged 18 to 89. Researchers used AI to estimate each participant’s “brain age” based on structural brain features visible in scans. They found that higher muscle mass and a lower visceral fat-to-muscle ratio correlated with younger-appearing brains. Conversely, participants with more visceral fat relative to muscle tended to have brains that appeared older biologically, independent of their chronological age.
The study emphasized that visceral fat—fat surrounding vital organs deep within the abdomen—was especially detrimental, whereas subcutaneous fat, located just under the skin, showed no significant association with brain aging. This suggests that hidden belly fat exerts more harmful effects on brain structure, potentially through inflammation and metabolic dysregulation.
Expert Perspectives and Biological Context
Dr. Cyrus Raji, the lead author and associate professor of radiology and neurology at Washington University School of Medicine, highlighted that muscle mass serves as a crucial indicator of overall metabolic and physical health. Loss of muscle mass often coincides with inflammation, obesity, and risk factors for Alzheimer’s disease. He explains that muscles release biochemical signals during physical activity that may positively affect brain function and other tissues, supporting cognition and slowing brain aging.
Other experts like Dr. Zqi Liu, professor of medicine, note that while the research does not prove causation, the link between greater muscle mass and younger brain age is consistent with the understanding that physical fitness and body composition influence brain health. Dr. Henry Chung, a physiologist, praised the study’s large sample and integration of MRI and AI, noting that increased muscle mass aligns with improved metabolism, less inflammation, and healthier aging in multiple body systems.
Public Health Implications
These findings underscore the importance of preserving muscle mass and minimizing visceral fat as potential strategies to maintain brain health and reduce the risk of cognitive decline or dementia later in life. Regular physical activity, especially resistance training that builds or maintains muscle, alongside lifestyle choices that reduce abdominal fat accumulation, could be actionable ways to support brain aging.
For the general public, this means that maintaining a balanced diet, engaging in exercise that promotes muscle strength, and managing weight and waist circumference are more than just physical health goals—they may also protect brain function and delay age-related cognitive changes.
Limitations and Balanced Perspective
While the study relied on large datasets and cutting-edge imaging techniques, the researchers caution that their findings represent associations rather than direct causation. Other factors like genetics, chronic diseases (e.g., diabetes), and lifestyle variables also influence brain aging. Furthermore, the role of visceral fat may vary by sex, with some evidence suggesting stronger effects in middle-aged men at higher Alzheimer’s risk.
Additional longitudinal and interventional studies are needed to clarify whether increasing muscle mass or reducing visceral fat can directly improve brain health outcomes.
Medical Disclaimer
Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.
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