WHO Warns Long-Term Air Pollution Exposure Could Lead to Dementia
UPSC / SSC current affairs note · IR
Why in news
WHO has issued new global guidelines on dementia prevention, adding air pollution as a modifiable risk factor for the first time. This is particularly relevant for India, where an estimated 8.8 million older adults live with dementia and air pollution levels are high.
Background
Dementia is a progressive brain disorder affecting memory and thinking, with Alzheimer's accounting for 60-70% of cases. WHO last updated its dementia prevention guidelines in 2019. The 2024 Lancet Commission identified 14 modifiable risk factors, including air pollution, that together could prevent up to 45% of dementia cases.
Key facts
WHO new guidelines state up to 45% of dementia cases could be prevented or delayed by tackling risk factors.
Air pollution is included for the first time as a modifiable risk factor for dementia.
Other risk factors include high blood pressure, diabetes, smoking, physical inactivity, and alcohol consumption.
WHO advises against routine use of vitamin and omega-3 supplements for dementia prevention without diagnosed deficiency.
Globally, over 57 million people have dementia, with nearly 10 million new cases annually.
A 2024 study in BMJ Public Health identified both outdoor and indoor air pollution as important dementia risk factors in India.
India has an estimated 8.8 million people aged 60+ living with dementia (prevalence 7.4% among older adults).
Recommendations include regular physical activity, quitting tobacco, limiting alcohol, healthy diet, social engagement, cognitive stimulation, and managing chronic diseases.
Use of hearing aids, where clinically indicated, may also reduce dementia risk.
Prelims pointers
- WHO: World Health Organization
- Dementia: progressive brain disorder; Alzheimer's disease accounts for 60-70% of cases
- Lancet Commission on Dementia Prevention, Intervention and Care (2024)
- BMJ Public Health study (2024) on air pollution and dementia in India
- Modifiable risk factors: high blood pressure, diabetes, smoking, physical inactivity, air pollution, alcohol, etc.
- Non-modifiable risk factors: age, genetics
Mains angles
- GS2 Health: Discuss the role of WHO guidelines in shaping national health policies, especially for non-communicable diseases and aging population.
- GS3 Environment: Examine the link between air pollution and cognitive decline; suggest policy measures to reduce air pollution in India.
- GS2 Social Justice: Analyze the burden of dementia in India's aging population and the need for preventive healthcare and awareness.