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Loneliness is often compared to risks such as smoking or obesity. However, new research shows its effect on the brain is more subtle.
TheDigger Intelligence Unit
A large European study tracked over 10,000 older adults for seven years and found that loneliness is linked to weaker memory at the start, but it does not seem to speed up memory decline over time.
The findings, published in Ageing & Mental Health, suggest that isolation may not directly increase dementia risk. Instead, loneliness appears to affect how well people remember things at the beginning.
A New Twist in the Loneliness Debate
“Loneliness strongly affected memory, but not the speed of decline over time—a surprising outcome,” said lead author Dr Luis Carlos Venegas-Sanabria of Universidad del Rosario in Colombia. “It suggests that loneliness may play a more prominent role in the initial state of memory than in its progressive decline.”
At the start of the study, participants who felt lonelier scored lower on both immediate and delayed memory tests. However, over time, their memory declined at almost the same rate as those who felt more connected.
This means loneliness affected their starting point, but not how quickly their memory got worse.
Why It Matters
Loneliness is now seen as a public health crisis, linked to shorter life, heart disease, depression, and worse overall health. The World Health Organisation has called social isolation a global priority. This study adds a new perspective: loneliness may quietly affect how well older adults remember things, even if it does not speed up memory loss.
Dr Venegas-Sanabria and his team suggest that regular checks for loneliness could be added to cognitive health assessments. “Addressing loneliness could be one of several ways to support healthier ageing,” he noted.
Mixed Evidence on Dementia Risk
The link between loneliness and dementia has been debated for a long time. Some studies said isolation speeds up memory loss, while others found no clear connection.
This new research, using data from the Survey of Health, Ageing and Retirement in Europe (SHARE), helps clarify things by separating starting memory levels from long-term decline.
The Human Side of the Numbers
The study also found regional differences. Loneliness was most common in Southern Europe, where 12% of participants reported high isolation, compared to 6–9% in other areas.
Those who felt lonelier were often older, female, and in poorer health, with more depression, diabetes, and high blood pressure.
For many people, these findings mean more than just numbers. “It stresses the importance of addressing loneliness not simply as an emotional issue, but as a cognitive one,” said Venegas-Sanabria.
Gazing Forward
The researchers note that the study treated loneliness as a fixed trait, even though feelings of isolation can change over time. Still, their results show that loneliness is linked to weaker memory at the beginning, but not to how quickly memory declines. In short, loneliness may lower the starting point for memory, but it does not make memory fade faster.
As societies deal with ageing populations, the study suggests that addressing loneliness could be as important as managing blood pressure or diabetes.
Memory is not just about brain cells; it is also about our connections with others.
