Loneliness Increases Cognitive Decline Risk and Mortality

A major international study has found that persistent feelings of loneliness significantly increase the risk of severe cognitive impairment and a shorter lifespan in older adults, while simply being alone does not show the same strong negative effects. The research, led by the University of California, Davis and involving over 175,000 adults aged 50 and older across 18 countries, was published in the Journal of Personality and Social Psychology.

The study distinguished between social isolation, which is an objective lack of social contact, and loneliness, defined as the distressing subjective feeling of being alone regardless of one's social surroundings. Researchers used advanced statistical modeling to track how these factors influenced transitions between cognitive health states and mortality over time.

The results were consistent and striking. A 10 percent increase in self-reported loneliness was associated with an 8 to 9 percent higher risk of developing severe cognitive impairment. It was also linked to a greater likelihood of transitioning from normal cognitive function to mild impairment. Furthermore, lonelier individuals were about 3 percent less likely to recover from...