An international team of researchers from the University of Bristol and Amsterdam University Medical Center has concluded that loneliness does not merely accompany declining health but directly impacts a person’s mental well-being and overall sense of wellness. By leveraging data from the UK Biobank, employing sibling comparison methods, and conducting genetic analysis, the scientists were able to distinguish cause from effect and achieve more reliable results. It turned out that the subjective feeling of loneliness—the lack of close relationships—affects health far more strongly than objective social isolation, meaning a limited number of social contacts.
Individuals who experience loneliness are more likely to report diminished mental health, a lower quality of life, and poorer overall well-being. They also face a higher likelihood of having multiple chronic conditions simultaneously. While social isolation is linked to reduced well-being, its impact on health is weaker. The researchers found no convincing evidence that loneliness directly triggers the development of specific physical diseases, but they cannot yet rule out such a connection entirely—further studies are needed to explore this.
According to lead author Zoe Reed, these findings underscore the importance of supporting people who feel lonely or socially isolated. Such support could help improve not only their mental state but also their overall health. The study also revealed that loneliness has long been underestimated as a risk factor, and its effects on the body now warrant closer attention from healthcare systems.
The research was conducted on middle-aged and older adults, so the scientists plan to investigate whether similar patterns hold true for younger people. In the future, they also aim to examine the effects of chronic, long-term loneliness, since the current study measured feelings of loneliness only at a single point in time. Nonetheless, the results already clearly indicate that loneliness is not merely a social issue but a serious factor capable of influencing mental health and quality of life. Consequently, addressing it must become an integral part of public health policy, the study authors argue.
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