A new analysis of nearly 609,000 people reveals that loneliness in midlife and old age increases the risk of dementia by 31%. The study, published in Nature Mental Health, highlights that loneliness is a significant risk factor for various forms of dementia and cognitive impairment. Researchers from multiple countries conducted the largest meta-analysis on this topic, finding that 35% of EU citizens report feeling lonely at times, with higher rates in certain countries. The study emphasizes the need to understand the sources of loneliness to mitigate cognitive decline risks.