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August 1, 2026European PsychiatryOpen Access

Loneliness and social isolation as risk factors for incident depression in type 2 diabetes mellitus: Evidence from a prospective cohort study

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Authors

XQXin QiLLLi LiuCPChuyu Pan

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Overview

Prospective cohort study finds loneliness and social isolation increase depression risk in individuals with type 2 diabetes.

Key Points

  • The study aims to explore how loneliness and social isolation contribute to the progression from type 2 diabetes mellitus to depression.
  • Enrolled 427,594 participants without T2DM and depression at baseline.
  • Utilized multistate models to analyze transitions from healthy state to incident T2DM, then to depression.
  • Examined associations across individuals with varying glycemic statuses, including normal glucose tolerance and prediabetes.
  • 14,141 incident cases of T2DM, 1,149 subsequent cases of depression, and 33,024 death events observed over a median follow-up of 13.66 years.
  • Loneliness is linked to a 1.802 HR (95% CI: 1.521-2.135) for progressing to depression from T2DM.
  • The most isolated group exhibited a 1.390 HR (95% CI: 1.185-1.632) for depression compared to the least isolated group.

Cite This Study

Qi et al. (2026) studied this question.

synapsesocial.com/papers/6a6d97eae258b358b3c6ab78https://doi.org/10.1192/j.eurpsy.2026.12244
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