A new study by the University of Southern California has found a strong link between loneliness, social isolation, and the risk of developing type 2 diabetes in older adults.
Published in the Journal of Aging and Health, the research tracked the health records of 3,833 people aged 60 to 84, revealing that those who felt consistently lonely or disconnected had a 34% higher likelihood of developing type 2 diabetes. Their chances of having elevated blood sugar levels were also 75% higher.
Researchers emphasised that these findings are especially concerning as the world sees a steady rise in ageing populations. The study pointed out that the effects of social isolation are not limited to mental well-being—they may trigger serious physical health conditions, including diabetes.
The distinction between loneliness and isolation was also highlighted. While isolation involves a lack of social contact, loneliness is the feeling of being emotionally alone even when surrounded by others. Both states, however, have been connected to increased risk of heart disease, stroke, and weakened immunity.
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Earlier studies support these claims. In January 2025, the University of Cambridge warned of a greater risk of cardiovascular disease among those experiencing loneliness. In 2023, researchers in China found similar results, noting poor lifestyle choices and weakened immune systems among isolated individuals.
While more research is encouraged, experts agree that loneliness should be treated as a public health issue. Public health specialist Dr Sameena Khwaja has urged action in countries like Pakistan, where elderly support is often lacking. She suggested community programmes and social interaction initiatives to address the issue.
Globally, over 400 million people live with type 2 diabetes. This study adds a powerful insight: emotional well-being can directly impact physical health in older adults.
