Is the association between depressive symptoms and glucose bidirectional? A population-based study

Area of Science:

• Endocrinology
• Psychiatry
• Epidemiology

Background:

• The relationship between depressive symptoms and Type 2 diabetes is established, but the directionality and underlying mechanisms are not fully understood.
• Investigating the bidirectional association between depression and glucose metabolism is crucial for understanding chronic disease development.

Purpose of the Study:

• To examine the temporal relationship between depressive symptoms and glucose levels in a large, prospective cohort.
• To investigate potential sex differences in this association.
• To explore mediating factors such as body mass index, inflammation, and lifestyle behaviors.

Main Methods:

• Utilized data from the Cardiovascular Risk in Young Finns Study (N = 2,534).
• Assessed depressive symptoms using a modified Beck Depression Inventory and measured fasting glucose levels.
• Employed multiple-group cross-lagged analysis and parallel multiple mediation within structural equation modeling.

Main Results:

• Depressive symptoms in 2001 were positively associated with glucose levels in 2012 among women (β = .07, p = .023), but not men (β = -.03, p = .45).
• This sex difference in the association was statistically significant (p = .042).
• Glucose levels in 2001 did not predict depressive symptoms in 2012 for either sex (ps > .05).

Conclusions:

• A significant association exists between depressive symptoms and glucose levels in women, with a temporal direction from depression to glucose.
• This association in women does not appear to be mediated by body mass index, high-sensitivity C-reactive protein, alcohol consumption, or smoking.
• The findings highlight potential sex-specific pathways linking mental health and metabolic regulation.