A new study suggests that a lack of social interaction may be a major contributor to dementia and other neurological disorders in older adults.
According to Fox News, researchers at the University of New South Wales (UNSW) in Sydney, Australia, studied 851 adults over the age of 70 who did not have dementia at the start of the research.
Participants were assessed for “social frailty,” which included measures of social support, frequency of interaction, sense of purpose, community engagement, and perceived social connectedness.
Based on these factors, participants were categorized as socially frail, pre-frail, or non-frail.
Over 12 years, participants underwent neuropsychological tests every two years to monitor the development of dementia.
The study controlled for other health factors, such as physical frailty, psychological health, and medical history.
The results showed that socially frail individuals faced a 47% higher risk of developing dementia compared to those in the non-frail group.
Key risk factors included infrequent social contact, low satisfaction with family and finances, and limited participation in social activities.
“In midlife, risk factors like hearing loss and metabolic syndromes like hypertension and diabetes are very important to prevent and manage,” said Dr. Suraj Samtani, co-author and clinical psychologist at UNSW’s Centre for Healthy Brain Ageing. “But in late life, social isolation is the biggest risk factor for dementia.”
Dr. Annabel Matison, co-author and postdoctoral research fellow, noted that the study population was largely healthy, well-educated, and Caucasian.
“We hope these findings raise awareness that poor social connections, resources and support are risk factors for dementia,” she told Fox News Digital. “We encourage older adults to stay socially active with family, friends, neighbors, and through volunteering.”
Other research supports the link between social interaction and brain health.
A Cornell University study found that strong social relationships can slow cellular aging by reducing chronic inflammation.
Longevity experts have also emphasized that meaningful connections, along with mental and physical exercise, are critical for cognitive health.
“Loneliness increases stress hormones, making you more vulnerable to anxiety and depression, and it’s just bad for you,” said psychiatrist Dr. Daniel Amen. “When you’re face-to-face with actual people, your brain has to work so much harder, which ultimately is working out your brain.”
The findings underscore the importance of maintaining social bonds in late life as a key factor in preserving cognitive function and overall health.
