Loneliness in older adults can often lead to memory impairment

Source: Ars Technica

Key Findings

The results show that age was the most important determinant of memory level and speed of decline. From the age of 75 onward, scores began to fall more rapidly, and after 85 the decline became more pronounced. Depression and chronic diseases such as diabetes also reduced the initial score. Loneliness, while influencing the starting point, did not accelerate the slope of cognitive decline.

Physical Activity

Physical activity was associated with better initial memory scores. People who engaged in moderate or vigorous physical activity at least once a month recalled more words on immediate and delayed recall tests. This effect did not change the speed of decline, but it raised the baseline level, functioning as a kind of “cognitive buffer.”

Potential Mechanisms

Although the study does not explore the causes of the link between loneliness and cognition, previous research has proposed plausible mechanisms:

• Loneliness is often associated with less social interaction, a factor that influences cognitive performance.
• It is linked to an increased risk of depression, which directly affects memory tests.
• Lonely individuals tend to have more health problems, such as hypertension or diabetes, which also affect cognitive function.

Demographic Outlook

By 2050, United Nations projections indicate that one in six people worldwide will be over the age of 65. Societies are entering a stage where old age will become the norm rather than the exception. Dementia and other neurodegenerative diseases that appear with age will pose a major challenge for health‑care institutions.

This story originally appeared on wired.com.