Health · Medical Research · 2 hrs ago
Study links greater extreme-heat exposure to higher dementia risk
Greater exposure to extreme heat was linked to higher dementia risk in a study of US adults.
Researchers tracked 28,512 people aged 50 to 89 and compared health records with local weather and neighborhood data.
People exposed to at least 7.2 days of dangerous heat a year had a 23% higher risk than those exposed to almost none.
The link was stronger in socially vulnerable neighborhoods, where the risk was about 26% higher, and in communities with limited access to air conditioning, where it was 20% higher.
The researchers say extreme heat may put extra strain on the body and brain, leaving less energy for processes such as thinking.
The findings show an association, not proof that heat causes dementia, and the study does not describe any next steps.
A study found that older adults with greater exposure to dangerous heat had a higher risk of developing dementia.
The research followed 28,512 adults aged 50 to 89 and compared health data with weather and neighborhood information.
People exposed to at least 7.2 days of dangerous heat a year had a 23% higher dementia risk than those exposed to almost none.
The risk increase was about 26% among older adults in socially vulnerable neighborhoods and 20% in communities with limited access to air conditioning.
Researchers said extreme heat may place extra demands on the body and brain, taking energy away from cognitive processes.
- Who
- Researchers at the Leonard Davis School of Gerontology studied 28,512 adults aged 50 to 89.
- What
- The study linked greater exposure to dangerous heat with a higher risk of developing dementia.
- When
- The study was published on November 5, 2026. It assessed heat exposure over five-year periods.
- Where
- The study examined older Americans, using data from the Health and Retirement Study.
- Why
- Researchers said extreme heat may make the body and brain work harder to maintain a suitable temperature, diverting energy from cognitive processes.
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- Study participants
- 28,512 adults aged 50 to 89
- High heat threshold
- Heat index of 39.4°C or higher
- Exposure period
- Five years
- Dementia risk increase
- 23% for those exposed to at least 7.2 dangerous-heat days per year
- Publication
- Alzheimer's & Dementia