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The WHO has updated its dementia advice. Here is what changed

Qurexa Editorial Team3 September 20267 min read 0 0
The WHO has updated its dementia advice. Here is what changed

What happened

The World Health Organization has published the executive summary of the second edition of its guidelines on reducing the risk of cognitive decline and dementia. The summary appeared in WHO's publications on 2 September 2026. The full second edition was published on 15 July 2026, replacing guidelines that had stood since 2019. Seven years is a long time in research, and the update reflects how much evidence has accumulated since. The 2019 guidelines already covered a familiar list: staying physically active, stopping smoking, eating well, cutting harmful drinking, keeping mentally and socially active, and managing conditions such as high blood pressure, diabetes, obesity, high cholesterol, depression and hearing loss. The second edition keeps those and widens the scope. It adds guidance in areas the first edition did not cover, including sleep, stroke, traumatic brain injury, vision impairment, HIV, and exposure to air pollution. It also puts more emphasis on two things. One is reducing exposure to environmental risk factors, which is largely a matter for governments and planners rather than individuals. The other is tailored multidomain interventions, which is the technical way of saying that tackling several risk factors together, in a way suited to the individual, tends to work better than picking one in isolation. The guidelines are aimed at health professionals and policymakers rather than written as advice for the public. But what is in them filters down into the advice people are given.

Why this matters

Dementia is one of the conditions people fear most, and for a long time the public message was essentially fatalistic. You got it or you did not. Age and genes decided. That picture has changed substantially. It is now well accepted that a meaningful share of dementia risk is linked to factors that can be changed, and that much of that risk accumulates over decades rather than in old age. The most widely cited estimate comes from the Lancet Commission on dementia prevention, which reported in 2024 that up to 45% of dementia cases worldwide could in principle be delayed or prevented if 14 modifiable risk factors were fully addressed. That 45% figure deserves careful handling, and it is often quoted badly. It is a theoretical maximum. It describes what would happen if every one of those risk factors were eliminated everywhere, which is not achievable in the real world. It does not mean any individual can cut their own risk by 45%, and it certainly does not mean that someone who develops dementia failed to do something. What it does mean is that dementia risk is not entirely fixed, and that some of the things that help are the same things that protect your heart. That overlap is genuinely useful. Managing your blood pressure is good for your heart and appears to be good for your brain. The additions in this second edition are worth noticing for a practical reason too. Hearing loss and vision loss are both on the list, and both are common, treatable and widely ignored. A hearing aid is a much easier intervention than overhauling your entire lifestyle.

What the evidence actually says

Guidelines like these summarise a large body of research, and the strength of the evidence is not the same for every recommendation. That is worth understanding rather than treating the whole list as equally certain. For some factors, particularly high blood pressure, smoking and physical inactivity, the evidence is substantial and consistent. For others, the picture is more uncertain, and the biggest difficulty across this whole field is telling apart cause from association. Here is the problem in plain terms. Many studies show that people with a particular characteristic, say hearing loss or poor sleep or social isolation, are more likely to develop dementia later. But dementia develops silently over many years. So it is genuinely difficult to know whether the hearing loss contributed to the dementia, or whether very early dementia contributed to the person withdrawing, sleeping badly and struggling with conversation. This is called reverse causation, and it haunts almost every study in this area. Good researchers work hard to account for it, and the WHO's process involves systematically assessing the quality of the evidence behind each recommendation. But it is why you should be sceptical of any headline claiming a single habit prevents dementia. The honest position is this. There is no proven way to guarantee you will not develop dementia. There are a number of things that appear to shift the odds, most of which are good for you anyway. That is a less satisfying message than a miracle prevention, and it is the accurate one.

Practical advice

Get your hearing checked if you have noticed any change, and use hearing aids if you are offered them. Hearing loss features in both the WHO guidelines and the Lancet Commission list, and untreated hearing loss is extremely common. Hearing tests are available through the NHS. Get your eyes tested. Untreated vision loss was added as a risk factor by the Lancet Commission in 2024. Free NHS sight tests are available to several groups, including everyone aged 60 and over in England. Keep on top of blood pressure, cholesterol and diabetes. These sit on every version of the list, and they are all things that can be measured and treated. Move regularly. It does not need to be a gym. Walking counts, and walking with other people counts twice, because it covers physical activity and social contact at once. Do not smoke, and keep alcohol within recommended limits. Take sleep seriously. It is newly covered in this edition. If you snore heavily, wake unrefreshed or feel very sleepy in the day, ask your GP about sleep apnoea rather than assuming it is just age. Protect your head. Traumatic brain injury is on the list, so helmets and fall prevention at home genuinely matter. Stay connected to other people. Social isolation is a recognised risk factor, and it is also miserable in its own right. If you are worried about your memory, or someone else's, see a GP. Some causes of memory problems are treatable, including thyroid problems, vitamin deficiencies, depression and side effects of medicines. Getting assessed is worth it either way.

What to know

The World Health Organization published the executive summary of the second edition of its guidelines on reducing the risk of cognitive decline and dementia on 2 September 2026. The full second edition was published on 15 July 2026 and replaces guidelines from 2019. The update keeps the established advice on physical activity, smoking, diet, alcohol, mental and social activity, blood pressure, diabetes, obesity, cholesterol, depression and hearing loss. It adds new areas including sleep, stroke, traumatic brain injury, vision impairment, HIV and air pollution, and it emphasises tackling several risk factors together rather than one at a time. The frequently quoted figure that up to 45% of dementia cases could be delayed or prevented comes from the 2024 Lancet Commission. It is a theoretical maximum across whole populations, not a promise available to any individual, and nobody who develops dementia should be made to feel they caused it. The evidence is stronger for some factors than others, and reverse causation makes this a genuinely difficult field. Treat single-habit dementia headlines with suspicion. The most actionable items on the list are also the least dramatic: get your hearing and eyes checked, keep blood pressure and blood sugar under control, keep moving, and stay connected to people. Sources: World Health Organization, "Risk reduction of cognitive decline and dementia: WHO guidelines, second edition", 15 July 2026, https://www.who.int/publications/i/item/9789240123557; World Health Organization, "News", accessed 3 September 2026, https://www.who.int/news; Alzheimer's Disease International, "Lancet Commission identifies two new risk factors for dementia and suggests 45% of cases could be delayed or reduced", https://www.alzint.org/news-events/news/lancet-commission-identifies-two-new-risk-factors-for-dementia-and-suggests-45-of-cases-could-be-delayed-or-reduced/; NHS, "Dementia", accessed 3 September 2026, https://www.nhs.uk/conditions/dementia/ This article is for general information and does not replace advice from a doctor, pharmacist or other qualified healthcare professional. If you are worried about memory or thinking problems, in yourself or someone else, please speak to a GP.

#dementia#brain health#prevention#World Health Organization#healthy ageing#hearing loss

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