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Why isolation harms the brain
Chronic loneliness keeps the body in a low-grade stress state. The resulting inflammation, poor sleep, and reduced mental stimulation accelerate the changes that lead to cognitive decline and dementia.
Research · Cognitive health
Loneliness, Social Isolation, and Dementia Risk
Social connection is not optional for the aging brain. Decades of research link isolation and loneliness to faster cognitive decline and a markedly higher risk of dementia — and, encouragingly, identify social engagement as one of the few modifiable ways to protect cognition.
← Back to all researchKey statistics
~50%
higher risk of dementia associated with social isolation
Source: CDC
~45%
of dementia cases linked to 14 modifiable risk factors, including social isolation
Source: Lancet Commission, 2024
Modifiable
social isolation is a preventable risk factor — not an inevitable part of aging
Source: NIH / NASEM
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What protects cognition
Regular social interaction, conversation, learning, and a sense of purpose are repeatedly associated with slower cognitive decline. Staying connected is one of the most accessible forms of brain protection.
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How Campus helps
Campus is built around exactly what protects the aging brain: regular community, conversation, learning, Shabbat and holiday life, and meaningful activity in nature — a steady source of the connection cognition depends on.
Frequently asked questions
Does loneliness increase dementia risk?+
Yes. The CDC reports that social isolation is associated with about a 50% increased risk of dementia, and loneliness is linked to faster cognitive decline and higher Alzheimer’s risk (NIH).
Can staying socially active reduce dementia risk?+
Evidence strongly suggests so. Social isolation is one of the modifiable risk factors the Lancet Commission (2024) links to dementia, and regular social engagement is associated with slower cognitive decline.
Is dementia risk preventable?+
Not entirely — but the Lancet Commission estimates that around 45% of dementia cases are linked to 14 modifiable risk factors, including social isolation, meaning connection is part of prevention.
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