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ConditionDementia
Also: alzheimer
Last scientific update: jun 2026
Dementia is an umbrella term for the gradual decline of memory and thinking, of which Alzheimer disease is the best-known form. It develops from damage to the brain over many years.
Dementia at a glance
Partly preventableYes, via lifestyleStrong
ImportantHearing, blood pressure, exerciseModerate
Early signPersistent memory problems
CureNot yet
A substantial part of dementia risk can be influenced by lifestyle, even though there is no cure yet.
31 studies5 answersupdated jun 2026
Evidence per claim
A large part of risk can be influenced by lifestyle
View evidence →Poor hearing raises dementia risk
View evidence →Staying social and active protects
View evidence →Fish oil pills do not demonstrably keep memory sharp
View evidence →Practical use
For whom
Everyone from middle age; early attention to hearing and blood pressure pays off.
Not for whom
Occasional forgetfulness is usually no cause for panic; watch for persistent decline.
Usual dose
Treat hearing loss, keep blood pressure and blood sugar healthy, exercise and stay socially active.
Key caveats
No supplement prevents dementia; it is about the sum of lifestyle factors.
What we know, and don't
Known
Part of the risk is modifiable
Hearing, blood pressure and exercise matter
Staying socially active helps
Not yet
Who exactly will get dementia
How much each factor contributes
Whether supplements add anything
Common misconceptions
"Dementia is purely bad luck and genetics."
Incomplete. A large part of the risk is linked to lifestyle.Moderate evidence
"Forgetfulness means early dementia."
False. Occasional forgetfulness is often just part of aging.Moderate evidence
"Fish oil pills protect your memory."
Not shown. That is not shown in healthy people.Moderate evidence
How Dementia connects
Effects
Conditions
Related
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