Social isolation can indeed increase the risk of dementia, according to recent research. A study published in March 2025 found that people who experience persistent loneliness, especially those over 70 years old, have a higher chance of developing dementia and cognitive decline[7]. This risk seems to be even greater for women.
Scientists have discovered that being socially isolated can harm our brains in several ways. When we don’t interact with others regularly, we miss out on important mental stimulation. Talking, sharing experiences, and engaging in activities with other people helps keep our minds active and sharp[5].
Loneliness and social isolation can also lead to depression, which is another risk factor for dementia. When people feel lonely, they’re more likely to develop depressive symptoms, and this can further impact their cognitive health[1].
A large study of over 12,000 Australians aged 70 and older showed some interesting results. Men who suddenly became lonely had a 52% higher risk of dementia. For women who felt lonely for a long time, the risk was even higher – they were 114% more likely to develop dementia compared to those who weren’t lonely[7].
It’s not just older adults who are affected. Even middle-aged people who are socially isolated may face a higher risk of cognitive problems later in life. This suggests that maintaining social connections throughout adulthood is important for brain health[12].
Interestingly, vision problems can contribute to social isolation and, in turn, affect cognitive function. People with poor eyesight might find it harder to participate in social activities, which can lead to feelings of loneliness and isolation[12].
The good news is that we can take steps to reduce the risk. Staying socially active, participating in group activities, and maintaining close relationships with family and friends can all help protect against cognitive decline[5]. Even using technology to stay in touch with loved ones can be beneficial, especially for those who have limited mobility[10].
For people who are already experiencing memory problems or mild cognitive impairment, addressing loneliness and social isolation is particularly important. These individuals may face even greater challenges in maintaining social connections[16].
In conclusion, social isolation does appear to increase the risk of dementia, but staying connected with others can help keep our brains healthy as we age. Whether it’s joining a club, volunteering, or simply spending time with friends and family, social interaction is a key part of maintaining cognitive health throughout life.
