Sex Differences in Relative Fat Mass and Cognitive Impairment in Chinese T2DM Patients

Overview

This cross-sectional study of hospitalized middle-aged and older Chinese patients with type 2 diabetes mellitus (T2DM) found that higher relative fat mass (RFM) is associated with increased risk of cognitive impairment (CI), with a stronger and nonlinear relationship observed in women compared to men. The findings highlight significant gender-based variations in the adiposity-cognition link in this population.

Background

Cognitive impairment and dementia are growing public health concerns, especially among aging populations with type 2 diabetes mellitus (T2DM), which is a known risk factor for cognitive decline. Obesity, commonly comorbid with T2DM, contributes to cognitive dysfunction through mechanisms including inflammation and vascular dysfunction. Traditional obesity measures like BMI have limitations, prompting use of relative fat mass (RFM), a more accurate adiposity estimator. Prior research suggests sex differences in how adiposity affects cognition, but the relationship between RFM and cognitive impairment in T2DM patients remains underexplored.

Data Highlights

The study included hospitalized patients aged ≥45 years with T2DM, excluding those with conditions affecting cognition. RFM was calculated using waist circumference and height with sex-specific formulas. Cognitive function was assessed using the Montreal Cognitive Assessment (MoCA), with scores <26 indicating cognitive impairment. The study analyzed sex-specific associations between RFM and cognitive impairment, adjusting for demographic and clinical covariates.

Key Findings

• Higher RFM was significantly associated with increased risk of cognitive impairment among hospitalized middle-aged and older patients with T2DM.
• The association between RFM and cognitive impairment was stronger and nonlinear in women compared to men.
• Women with higher RFM showed a more pronounced decline in cognitive function, suggesting sex-specific vulnerability.
• The study supports RFM as a more precise anthropometric measure than BMI for assessing adiposity-related cognitive risk in T2DM.
• Findings align with prior evidence of sex differences in adiposity’s impact on cognition, potentially influenced by hormonal and cardiovascular risk factor management differences.

Clinical Implications

Clinicians should consider sex-specific adiposity measures such as RFM when assessing cognitive risk in patients with T2DM. Women with elevated RFM may require closer cognitive monitoring and targeted interventions to mitigate cognitive decline. Incorporating RFM into routine assessments could improve identification of patients at higher risk for cognitive impairment, enabling personalized management strategies.

Conclusion

This study demonstrates a significant, sex-specific association between relative fat mass and cognitive impairment in Chinese patients with T2DM, with women exhibiting a stronger relationship. These findings underscore the importance of using precise adiposity measures like RFM to identify and manage cognitive risk in this population.

References

1. Global dementia prevalence projections (2015-2050)
2. Prevalence of mild cognitive impairment in T2DM patients
3. Cognitive impairment prevalence among older Chinese patients with diabetes
4. Impact of cognitive impairment on diabetes self-management
5. Pathophysiological links between T2DM, obesity, and cognitive impairment
6. Limitations of BMI and advantages of RFM in adiposity assessment
7. Sex differences in adiposity and cognitive outcomes
8. Montreal Cognitive Assessment validation and use