The location of your body fat is linked to how fast your brain ages

Key Points:

• A new study published in Nature Mental Health reveals that fat distribution across the body, not just total fat amount, significantly influences brain structure, function, and cognitive performance in middle-aged and older adults.
• Researchers analyzed data from over 18,000 UK Biobank participants using DXA scans to measure fat in different body regions and MRI to assess brain health, controlling for overall BMI to isolate the effects of specific fat depots.
• Visceral fat around abdominal organs was most strongly linked to harmful changes in brain white matter and cognitive decline, while arm and trunk fat were associated with thinning of sensorimotor cortex and hippocampal volume reduction.
• Leg fat showed a unique association with weakened limbic system connectivity, potentially related to leptin hormone secretion, which affects memory and emotion regulation.
• The study highlights the importance of considering regional fat distribution beyond BMI in understanding brain aging, though its cross-sectional design and sample limitations prevent causal conclusions and broad generalization.