Visceral Fat Measures Show Stronger Dementia Link Than BMI

Deep abdominal fat may reveal more about future dementia risk than body weight alone, according to a large observational analysis. This fat surrounds internal organs and is associated with inflammation, insulin resistance, impaired glucose regulation, unhealthy cholesterol and blood-vessel problems. Those metabolic effects may influence the brain over time, although the findings do not establish that visceral fat causes dementia.

The cohort exceeded 327,000 UK Biobank participants, all without dementia at the outset. During follow-up, 8,768 developed the condition. Researchers evaluated two newer scores reflecting visceral fat and metabolic health, first checking them against measurements produced by imaging. They then studied dementia outcomes while accounting for genetic risk, cardiovascular and metabolic health. Higher scores showed stronger associations with dementia, particularly the vascular form.

BMI changed little before participants developed dementia. Waist size and fasting glucose, however, rose during that period. The association with Alzheimer’s disease was greatest among people with low or moderate inherited risk. Together, these findings suggest that central fat and metabolic changes may provide information that BMI misses. Better metabolic health cannot guarantee protection from cognitive decline, but the article notes that it may reduce vulnerability to a later diagnosis.