Dementia is a condition caused by brain diseases and affects memory, thinking and the ability to function. More than 57 million people live with dementia worldwide and nearly 10 million people get newly diagnosed every year. Alzheimer disease is the most common form of dementia and is estimated to account for 60–70% of cases.
"We know more today than ever before about what drives dementia risk, and these guidelines translate that knowledge into action," said Dr Tedros Adhanom Ghebreyesus, WHO Director-General. "Countries now have clear, evidence-based recommendations they can put into practice immediately to protect people's cognitive health."
The updated guidelines reflect significant growth in the evidence base since WHO first issued recommendations on dementia risk reduction in 2019. They provide consolidated recommendations on addressing unhealthy behaviours, managing medical conditions, and reducing exposure to environmental factors that may contribute to cognitive decline and dementia.
The updated advice also includes interventions that reduce risk of NCDs, including increasing physical activity, stopping tobacco use, reducing alcohol consumption, adopting a healthy diet, and a new recommendation to reduce exposure to air pollution.
As an intervention to reduce the risk of cognitive decline and/or dementia, the guidelines do not recommend supplementation with vitamins B and E, omega-3 polyunsaturated fatty acids (PUFA) and multivitamins/minerals in the absence of a diagnosed deficiency, due to the lack of evidence of any potential benefits to outweigh unexpected harmful effects.
Human and economic cost
Dementia affects an individual’s ability to live independently, work and function, while placing substantial burdens on families and carers. It carries a major economic loss, costing the global economy an estimated US$ 1.3 trillion annually. About half of this cost is driven by unpaid care provided by families and friends. Understanding risk factors and taking action to prevent dementia can improve health and quality of life, helping people live longer, healthier and more independent lives.
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