Metabolic Health Tied to Dementia

In two population-based cohorts, metabolically unhealthy status generally showed higher dementia risk estimates, while metabolically healthy obesity was not associated with increased risk in primary analyses.

By
Andrea Surnit
June 29, 2026
6 min

Conexiant

Objective:

To investigate the relationship between metabolic health status and dementia risk, independent of obesity status.

Approach:

Study Design: A prospective cohort study analyzing data from 11,482 patients in the US Health and Retirement Study and 13,068 patients in the Swedish Twin Registry, all free of dementia at baseline.
Classification: Patients were classified into four groups based on metabolic health and obesity status: metabolically healthy without obesity, metabolically healthy with obesity, metabolically unhealthy without obesity, and metabolically unhealthy with obesity.
Dementia Risk Evaluation: Cox proportional hazards models were used to evaluate dementia risk, adjusted for age, sex, smoking status, and education level, with follow-up ranging from 8 to 17 years.

Key Findings:

Metabolically unhealthy status without obesity was associated with a 62% higher adjusted hazard of dementia in midlife among women in the Health and Retirement Study.
In the Swedish Twin Registry, metabolically unhealthy status without obesity in late life was linked to a 13% higher adjusted hazard of dementia.
Metabolically healthy obesity was not associated with increased dementia risk in either age group.
Findings for metabolically unhealthy obesity were inconsistent across cohorts, particularly in late life.

Interpretation:

Limitations:

Dementia ascertainment methods differed between cohorts, potentially affecting results.
The study assessed all-cause dementia and could not evaluate dementia subtypes.
Follow-up duration may have been insufficient to capture the long preclinical phase of dementia.
The observational design limits conclusions about causality.