Up to 45% of dementia risk could be prevented or delayed by addressing modifiable factors, according to WHO in its second-edition guidelines released 15 July 2026. For adults over 65, a realistic brain-health plan means acting on daily habits plus blood pressure, blood sugar, weight, cholesterol, and hearing. Modifiable risk means factors people and health systems can change, such as tobacco use, physical inactivity, and hypertension. Dementia describes loss of memory, thinking, and daily function from brain diseases, and WHO notes there is no cure, which makes prevention central.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does the 45% number mean?
- Why does this matter most after 65?
- Which daily habits does WHO recommend?
- What should older adults do about vascular and hearing risks?
- How can you build a simple weekly plan?
What does the 45% number mean?
The 45% figure is a population share, not a personal promise. It estimates cases that could be prevented or delayed if major risks were fully removed across society. That framing matters for planning.
One person cannot remove air pollution alone or undo past exposure, but can change tobacco use, activity, drinking, diet, social contact, and medical risks. As reported in the WHO announcement, WHO links that preventable share to tobacco, alcohol use, physical inactivity, social isolation, air pollution, hypertension, and diabetes. Most WHO prevention actions are conditional recommendations based on low or very-low certainty evidence. WHO also found insufficient evidence to recommend treating depression only to prevent dementia.
Why does this matter most after 65?
Most dementia occurs later in life. Global Alzheimer's and dementia cases in people 65 and older rose from 18.1 million in 1990 to 49.1 million in 2021, according to the Frontiers in Aging Neuroscience analysis. More than 57 million people live with dementia worldwide, with nearly 10 million new diagnoses each year.
Age remains the strongest risk marker, even though age itself cannot change. After 65, small gains compound. Better walking ability, blood-pressure control, hearing, sleep routines, and social contact support independence, safety, and care needs.
Which daily habits does WHO recommend?
For adults with normal thinking and memory, WHO strongly recommends physical activity to lower cognitive-decline risk. For mild cognitive impairment, it conditionally suggests activity, along with cognitive training, cognitive stimulation, and social-activity engagement. Practical movement can be brisk walking, cycling, swimming, dancing, gardening, or chair-based exercise.
Aim for regular sessions across the week, plus balance and strength work to prevent falls. WHO also advises offering help to quit tobacco, offering help to reduce or stop hazardous drinking, and choosing a healthy balanced diet such as Mediterranean, DASH, or MIND patterns. It advises against vitamin B, vitamin E, omega-3, or multivitamins for dementia prevention, as described in the Guideline Central summary of the WHO guidelines.
What should older adults do about vascular and hearing risks?
WHO conditionally supports managing hypertension, diabetes, midlife dyslipidaemia, and overweight or obesity in adults who have those conditions. It also supports hearing aids for people with hearing loss to lower decline and dementia risk. Ask a clinician for a clear target and review date for blood pressure, blood sugar, cholesterol, and weight.
Bring a medication list, home readings when available, and notes on dizziness, falls, low blood sugar, or missed doses. Treat hearing loss as brain-health care. Get hearing checked, use prescribed hearing aids consistently, reduce background noise during talks, and ask others to face you and speak clearly.
How can you build a simple weekly plan?
Start with what fits current health, energy, and support. A primary-care visit, pharmacist review, quitline, dietitian, physical therapist, audiologist, or community center can tailor next steps.
- Move most days, add two strength sessions, and practice balance near a counter or rail
- Cook one Mediterranean-style meal, stock fruit, vegetables, beans, fish, nuts, and olive oil
- Join one social activity with thinking involved, such as cards, choir, classes, volunteering, or walks
- Set tobacco and alcohol goals, place aids and pill organizers where they get used, and book hearing and eye checks
