Lifestyle Medicine and Brain Health in Viet Nam: Dementia Risk Reduction, Cognitive Health, and What the Latest Evidence Supports

Lifestyle Medicine and Brain Health in Viet Nam: Dementia Risk Reduction, Cognitive Health, and What the Latest Evidence Supports

Last reviewed: 29 September 2026

Brain health is sometimes discussed as if keeping the brain healthy simply means doing puzzles, eating certain “brain foods,” taking supplements, or trying to prevent Alzheimer disease. The reality is more complex. Brain health is shaped across the life course by physical health, education, social connection, sensory function, cardiovascular and metabolic health, mental health, injuries, environmental exposures, and many other factors.

The World Health Organization defines brain health broadly, covering cognitive, sensory, social-emotional, behavioral, and motor functioning across the life course. Cognitive health is therefore an important part of brain health, but it is not the whole concept. Dementia is also not an inevitable part of aging. Age remains its strongest known risk factor, but evidence increasingly shows that some dementia risk can be modified. [1,2]

Lifestyle Medicine has an important role here, but careful language matters. Physical activity, healthy eating, avoiding tobacco, reducing harmful alcohol use, maintaining social connection, and addressing cardiometabolic risk can all contribute to brain health. At the same time, dementia risk is influenced by factors such as hearing loss, vision impairment, education, traumatic brain injury, air pollution, and access to appropriate healthcare. Lifestyle Medicine is therefore best understood as one part of a broader life-course approach to brain health, not as a stand-alone method for “preventing dementia.”

That distinction became even more relevant in 2026. In July, the World Health Organization published the second edition of its Guidelines on Risk Reduction of Cognitive Decline and Dementia, updating the 2019 guidance after substantial growth in the evidence base. The guideline applies to adults without dementia, including people with normal cognition or mild cognitive impairment. It brings together healthy behaviors, management of health conditions, environmental exposures, and tailored multidomain interventions, while also identifying areas where the evidence remains insufficient. [1]

Why does this matter in Viet Nam?

Viet Nam is aging rapidly. As of September 2025, the country had approximately 16.5 million people aged 60 years or older, accounting for about 16% of the population. Viet Nam entered the population-aging phase in 2011 and is projected to become an aged society by around 2036. The challenge is therefore not simply helping people live longer, but helping them preserve cognition, physical function, independence, and quality of life for as long as possible. [3,4]

National evidence on dementia remains incomplete. A 2025 analysis based on Global Burden of Disease 2021 estimates reported an age-standardized prevalence of Alzheimer disease and other dementias in Viet Nam of approximately 649 per 100,000 population in 2021. These are modeled estimates rather than results from a contemporary nationwide diagnostic survey. The study found modest declines in age-standardized incidence and prevalence between 1990 and 2021, while age-standardized mortality and disability-adjusted life-year rates increased. [5]

The policy environment is also changing. Decision No. 1116/QĐ-TTg, issued on 22 June 2026, amended Viet Nam's national program for the health care of older people through 2030. From 2026, older people are to receive at least one free periodic health examination or screening each year and have health records established for ongoing management. By 2030, the program aims for at least 90% of older people to have major noncommunicable diseases detected, treated, and managed, with dementia explicitly included among the conditions listed. [6]

As cognitive health becomes more visible within healthy aging and chronic disease care, healthcare professionals need to understand what risk reduction can realistically achieve, what the evidence supports, and when cognitive concerns require formal clinical assessment.

What does the “45%” figure really mean?

One of the most widely reported figures in dementia prevention is 45%. The 2024 Lancet Commission identified 14 potentially modifiable risk factors across the life course and estimated a combined population-attributable fraction of approximately 45%. In broad terms, this suggests that at a population level, a substantial proportion of dementia cases might potentially be prevented or delayed if these risks could be effectively addressed. [7]

It does not mean that an individual can reduce their personal risk of dementia by exactly 45% by changing their lifestyle. It also does not mean that 45% of dementia is simply caused by “unhealthy choices.”

The factors considered by the Lancet Commission include lower educational attainment, hearing loss, high low-density lipoprotein cholesterol, depression, traumatic brain injury, physical inactivity, diabetes, smoking, hypertension, obesity, excessive alcohol consumption, social isolation, air pollution, and untreated vision loss. Some are behavioral, but others are medical, sensory, environmental, educational, or structural. Many cluster within the same person, and their relevance varies across different stages of life. [7]

The more useful clinical message is therefore not that dementia is “45% preventable.” It is that there are meaningful opportunities across the life course to reduce potentially modifiable risks, while recognizing that dementia can still occur in people who follow healthy lifestyles and that many important determinants lie beyond individual choice.

Lifestyle Medicine overlaps strongly with brain health, but it is not the whole field

There is substantial overlap between Lifestyle Medicine and dementia risk reduction. Physical activity, nutrition, tobacco and alcohol use, social connection, weight, blood pressure, diabetes, and lipid management are relevant to both chronic disease care and brain health. The 2025 Lifestyle Medicine Core Competencies similarly address nutrition, physical activity, sleep, harmful substance use, social connectedness, behavior change, and integrated clinical management. [8]

Current dementia guidance extends further. The World Health Organization's 2026 guideline covers 19 risk-factor or intervention-target areas. Alongside physical activity, diet, tobacco and alcohol use, social activity, cognitive activity, and cardiometabolic conditions, it considers hearing and vision impairment, depression, stroke, traumatic brain injury, sleep, human immunodeficiency virus, menopausal hormone therapy, and air pollution. It also considers interventions that address several risks at the same time. [1]

A person cannot exercise their way out of untreated hearing loss. A healthier diet cannot replace appropriate management of hypertension. Better sleep does not remove the need to assess progressive memory problems, and individual advice cannot solve population exposure to fine particulate air pollution. Brain health therefore requires Lifestyle Medicine to work alongside primary care, neurology, geriatrics, rehabilitation, mental health, hearing and vision care, public health, and other relevant disciplines.

Physical activity has some of the clearest support

Among lifestyle interventions, physical activity has one of the clearer dementia-related evidence bases. The World Health Organization gives a strong recommendation, supported by moderate-certainty evidence, for physical activity in adults with normal cognition to reduce the risk of cognitive decline. For people with mild cognitive impairment, the recommendation is more cautious because the certainty of evidence is lower. [1]

This does not mean there is one “brain exercise prescription” suitable for everybody. Aerobic activity, muscle strengthening, balance, and reducing sedentary time all have broader health benefits, while an individual program should reflect age, physical capacity, cardiovascular status, musculoskeletal conditions, falls risk, and other clinical considerations.

For healthcare professionals in Viet Nam, brain health can reasonably be included in conversations about physical activity alongside cardiovascular health, diabetes prevention, functional capacity, and mental well-being. Promising that a particular exercise program will prevent Alzheimer disease, however, goes beyond what current evidence can support.

What does the evidence say about diet and supplements?

Nutrition is an area where public messaging can easily move ahead of the evidence. The 2026 World Health Organization guideline indicates that a healthy, balanced dietary pattern may be recommended for adults with normal cognition or mild cognitive impairment as part of dementia risk reduction. It emphasizes adequacy, balance, diversity, and moderation, while recognizing that healthy eating needs to reflect individual needs, culture, food availability, and local dietary traditions. [1]

For Viet Nam, this means that supporting brain health does not require replacing Vietnamese foods with an imported named diet. The practical task is to translate the broader evidence into culturally appropriate eating patterns that support cardiometabolic health and adequate nutrition, while reducing excessive sodium, added sugars, poor diet quality, and other patterns associated with chronic disease.

The guideline is also cautious about supplements. In people without an established deficiency, vitamins B and E, omega-3 polyunsaturated fatty acids, and multivitamin or mineral supplementation are not recommended specifically for reducing cognitive decline or dementia risk. [1] “Natural” does not automatically mean effective, and marketing a supplement as a way to prevent dementia is very different from identifying and treating an actual nutritional deficiency.

Cardiometabolic health is also brain health

Some of the most practical opportunities for dementia risk reduction already exist within ordinary chronic disease care. Hypertension, diabetes, dyslipidemia, and excess weight are not only cardiovascular or metabolic concerns. They also form part of the contemporary dementia risk framework.

The World Health Organization includes appropriate management of these conditions within its risk-reduction guidance, although the strength and certainty of dementia-specific evidence vary across conditions and age groups. [1] The clinical message is not that Lifestyle Medicine should replace medication. A person with hypertension may benefit from reducing dietary sodium, increasing physical activity, addressing excess weight, and avoiding tobacco, while still requiring antihypertensive medication. Someone with diabetes may need nutrition and physical activity support alongside glucose-lowering treatment. Lipid management may similarly involve both lifestyle measures and medication based on the person's overall cardiovascular risk and current clinical guidance.

For brain health, good care is integrated care rather than a choice between “lifestyle” and “medical treatment.”

Tobacco, alcohol, social connection, and cognitive activity

Smoking is a recognized potentially modifiable dementia risk factor, and tobacco cessation has substantial health benefits well beyond the brain. Harmful alcohol use is also relevant. Current evidence does not provide a reason for someone who does not drink alcohol to start drinking in an attempt to protect cognitive health. For people with tobacco dependence, harmful alcohol use, or alcohol dependence, brief lifestyle advice may be insufficient; appropriate behavioral and, where indicated, pharmacological treatment may be needed.

Social connection also matters. Social isolation appears among potentially modifiable dementia risks, while meaningful relationships and participation have wider benefits for mental health, physical health, and quality of life. The World Health Organization supports social participation across the life course, although the dementia-specific certainty of evidence for social activity interventions remains limited. [1]

Cognitive activity deserves similar nuance. “Do more puzzles” is not a complete brain-health strategy. Structured cognitive training may be considered for older adults with normal cognition or mild cognitive impairment, but the certainty of evidence is lower than for some other interventions. Reading, learning, storytelling, games, creative activities, and other forms of cognitive stimulation may be worthwhile parts of healthy aging, but they should not be marketed as guaranteed protection against dementia.

Sleep matters, but dementia-specific claims should remain modest

Restorative sleep is a core domain of Lifestyle Medicine, and poor sleep deserves attention for many reasons. Sleep disorders can affect daytime function, cardiovascular and metabolic health, mental health, safety, and quality of life.

At the same time, the 2026 World Health Organization guideline found insufficient evidence to recommend treatment of sleep-wake disorders specifically for the purpose of reducing cognitive decline or dementia risk. [1] That does not mean sleep disorders should be ignored. Chronic insomnia, obstructive sleep apnea, and other sleep conditions may require appropriate assessment and treatment. It means that treating an important health problem and claiming that the treatment has been proven to prevent dementia are not the same thing.

The distinction between an association and evidence that an intervention actually changes a clinical outcome is central to evidence-based Lifestyle Medicine.

Hearing, vision, and air pollution show the limits of an individual lifestyle approach

Hearing loss has become an important part of dementia risk-reduction discussions. The World Health Organization states that hearing aids may be offered to adults with hearing loss as part of dementia risk-reduction strategies, although the recommendation is conditional and the dementia-specific certainty of evidence is limited. [1] Hearing assessment and treatment remain valuable in their own right because hearing affects communication, safety, social participation, and quality of life.

Vision impairment illustrates a different issue. Untreated vision loss was included among the 14 potentially modifiable factors in the 2024 Lancet Commission, but the World Health Organization concluded that there was still insufficient intervention evidence to recommend treatment of vision impairment specifically as a dementia risk-reduction intervention. [1,7] Appropriate eye care should of course still be provided for its established benefits.

Air pollution makes the limits of individual responsibility even clearer. The 2026 guideline states that reducing exposure to household and ambient air pollution, particularly fine particulate matter, may reduce the risk or incidence of cognitive decline or dementia, although the certainty of dementia-specific evidence is very low. [1] For Viet Nam, this reinforces the need to think beyond personal behavior. Individuals may be able to reduce some exposures, but cleaner air ultimately depends on environmental, transport, occupational, urban-planning, and public policy measures.

Current evidence increasingly supports a tailored multidomain approach

Rather than searching for a single “best” intervention, current dementia research increasingly looks at combinations of risks and interventions. The 2026 World Health Organization guideline states that tailored multidomain interventions may be offered for dementia risk reduction. The recommendation is conditional, with moderate-to-high certainty of evidence. These approaches address several relevant risks together and can be adapted to individual, cultural, socioeconomic, and resource contexts. [1]

Recent clinical research provides useful support for this direction. The United States Study to Protect Brain Health Through Lifestyle Intervention to Reduce Risk, known as the United States POINTER trial, randomized 2,111 adults aged 60 to 79 years who were at increased risk for cognitive decline to either a structured multidomain intervention or a lower-intensity self-guided program. Both groups received lifestyle support, but the structured intervention provided more intensive physical activity, dietary support, cognitive and social engagement, and cardiovascular health monitoring. After two years, global cognitive scores improved in both groups, with a small but statistically greater improvement in the structured group. [9]

The result is encouraging, but it should not be translated into a claim that the program “prevented dementia.” The study compared two active lifestyle interventions, and further research is needed to understand the clinical significance and longer-term cognitive effects. A prespecified 2026 imaging analysis involving 959 participants found that the structured intervention attenuated increases in a diffusion magnetic resonance imaging marker called free water among participants younger than 70 years, while several other cerebrovascular imaging markers did not show an intervention-related difference. These findings are scientifically interesting, but they do not establish dementia prevention. [10]

The broader lesson may be more useful than any one trial result. People often have several interacting risks, so structured support that addresses the risks actually present may make more sense than giving everybody the same brain-health checklist.

What should Lifestyle Medicine not promise?

Lifestyle Medicine should not promise that dementia can be prevented in every person, and it should never imply that someone who develops dementia failed to live correctly. Genetics, aging, neurodegenerative disease, vascular disease, social and economic circumstances, education, environmental exposures, and many other influences contribute to dementia risk. Some can be modified; others cannot.

Supplements, detox programs, highly restrictive diets, unvalidated cognitive testing, or commercial “brain optimization” products should not be presented as established dementia prevention. Improvements in weight, blood pressure, blood glucose, a biomarker, or a cognitive test are also not automatically proof that dementia has been prevented.

Most importantly, a focus on risk reduction should never delay assessment when cognitive symptoms have already appeared.

When should cognitive change lead to medical assessment?

Occasional forgetfulness is common and does not automatically mean dementia. Cognitive symptoms can have many causes, including medication effects, depression, sleep disorders, hearing or vision problems, metabolic abnormalities, nutritional deficiencies, infection, neurological disease, and other medical conditions.

Medical assessment becomes more important when memory, language, attention, judgment, orientation, or other cognitive abilities are progressively changing; when family members, friends, or colleagues notice a clear decline; when someone becomes lost in familiar places; or when managing medication, finances, cooking, driving, work, or other everyday activities becomes more difficult.

Mild cognitive impairment and dementia are not interchangeable. Mild cognitive impairment generally refers to measurable cognitive decline without substantial loss of independence in everyday activities, while dementia involves cognitive impairment significant enough to interfere with daily functioning. Determining what is causing those changes requires appropriate clinical assessment rather than a lifestyle questionnaire or a consumer cognitive application.

Sudden confusion or rapidly changing cognition is different again. Acute confusion may represent delirium or another urgent medical problem. New cognitive change accompanied by weakness, facial asymmetry, speech difficulty, severe headache, loss of consciousness, or other acute neurological symptoms requires urgent medical assessment because conditions such as stroke may be involved.

Lifestyle Medicine can remain supportive in these situations, but it is not a substitute for diagnosis.

What does the Vietnamese legal framework mean for Lifestyle Medicine and brain health?

The distinction between general health education and clinical care is legally important in Viet Nam. The current consolidated Law on Medical Examination and Treatment specifies the professional titles that require a practice license and provides for the Ministry of Health to regulate the scope of practice associated with those professional titles. [11]

Lifestyle Medicine is not currently listed as a separate professional title requiring a practice license under this framework. International Lifestyle Medicine education or certification may strengthen a healthcare professional's knowledge and skills, but it does not independently create a new Vietnamese professional license or expand that person's legally authorized scope of practice.

In practical terms, providing general education about physical activity, healthy eating, tobacco avoidance, sleep, or social participation is different from diagnosing mild cognitive impairment or dementia, changing medication, treating hypertension or diabetes, managing a mental disorder, assessing a hearing disorder, or interpreting neurological symptoms. Regulated clinical activities need to remain within the qualifications, competence, and authorized scope of the relevant professional.

Cognitive screening also needs a clear clinical pathway. A screening result can indicate that further assessment may be appropriate, but it does not by itself establish a diagnosis of dementia. Healthcare organizations using cognitive screening should therefore be clear about who reviews results, what findings trigger further assessment, where referral occurs, and how people with abnormal findings are followed.

This becomes especially relevant as Viet Nam expands health examinations and screening for older people under Decision No. 1116/QĐ-TTg. The value of screening will depend not simply on identifying possible cognitive problems, but on linking people to appropriate assessment, diagnosis, treatment, rehabilitation, social support, and follow-up when needed. [6]

What could healthcare organizations build into a brain-health approach?

A responsible brain-health pathway does not necessarily need to begin with a specialized “dementia prevention clinic.” Many of its components already belong within good primary care, chronic disease management, healthy aging, and preventive healthcare.

Healthcare organizations can assess physical activity, tobacco and alcohol use, nutrition, weight, blood pressure, glucose, and lipid-related risk while also paying attention to social connection, hearing, vision, cognitive concerns, sleep, and relevant environmental or occupational exposures. The purpose should not be to label everybody as being “at risk of dementia,” but to identify clinically meaningful issues that deserve attention for overall health.

Care should be individualized. A middle-aged person with hypertension, diabetes, smoking, and physical inactivity requires a different plan from an older adult whose main concerns are hearing loss, social isolation, and emerging memory difficulty. Someone with progressive cognitive symptoms needs a diagnostic pathway, not simply a more intensive lifestyle program.

A multidisciplinary model is particularly appropriate. Physicians, nurses, clinical nutrition professionals, rehabilitation and exercise professionals, psychologists, pharmacists, hearing and vision professionals, and other disciplines can contribute according to their expertise and lawful scope of practice. Community resources may also support physical activity, social participation, and healthy aging.

Healthcare organizations can also consider measuring whether their pathways are working. Depending on the setting, useful measures might include appropriate blood pressure and diabetes management, tobacco cessation support, physical activity assessment, referral for relevant hearing or vision concerns, follow-up after abnormal cognitive screening, and time from an identified cognitive concern to appropriate clinical assessment. These are possible quality-improvement measures, not a nationally mandated Lifestyle Medicine indicator set.

Equity also matters. Advice that assumes everybody has safe places to exercise, affordable healthy food, clean air, access to hearing aids, time for social activities, or easy access to specialists can unintentionally widen disparities. The 2026 World Health Organization guidance emphasizes integrated and multisectoral approaches, structural and sociocultural barriers, and equity as a central consideration. [1]

The central question is not “Which lifestyle habit prevents dementia?”

A more useful question is: “Which potentially modifiable risks are present in this person, what interventions are supported by evidence, and what clinical care or broader support is needed?”

For one person, improving physical activity and controlling hypertension may be priorities. Another may need better diabetes or lipid management. Someone else may benefit most from tobacco cessation, hearing assessment, or reconnecting with meaningful social activity. An older person with progressive memory problems may need formal cognitive or neurological assessment. A community exposed to high levels of air pollution needs solutions that go far beyond what an individual patient can change.

This is where Lifestyle Medicine can make a meaningful contribution to brain health. Its value does not lie in claiming that lifestyle can eliminate dementia. It lies in helping healthcare professionals address modifiable behaviors and cardiometabolic risks systematically, support sustainable change, recognize social and environmental context, and work within a broader multidisciplinary model of care.

The latest evidence is encouraging about the possibility of reducing some risks and supporting cognitive health across the life course. It also makes clear that brain health is not determined by one intervention, one profession, or individual responsibility alone.

For Viet Nam, the opportunity is to integrate brain health into prevention, chronic disease management, healthy aging, and primary care while maintaining realistic expectations, appropriate professional boundaries, and reliable pathways for assessment when cognitive problems emerge. Lifestyle Medicine can be an important part of that model, but its credibility depends on being as clear about its limits as it is about its possibilities.

References

1. World Health Organization. Risk Reduction of Cognitive Decline and Dementia: WHO Guidelines, Second Edition. Geneva: World Health Organization; 2026.

2. World Health Organization. Optimizing Brain Health Across the Life Course: WHO Position Paper. Geneva: World Health Organization; 2022.

3. United Nations Population Fund Viet Nam. Investing in Population Policy: Viet Nam Places People at the Centre of Its Sustainable Development Strategy. 29 December 2025.

4. Jackson M. Population Ageing in Viet Nam: From Demographic Transition to Development Opportunity. United Nations Population Fund Viet Nam; 10 February 2026.

5. Vo QP, Dang BL, Luu BMT, Phan TC, Le PNB, Nguyen QDNV, Nguyen HTD, Truyen TTT. Burden and risk factors of Alzheimer's disease and other dementias in Vietnam from 1990 to 2021: A comprehensive analysis from global burden disease. Cerebral Circulation - Cognition and Behavior. 2025;9:100390. doi:10.1016/j.cccb.2025.100390.

6. Prime Minister of Viet Nam. Decision No. 1116/QĐ-TTg dated 22 June 2026, amending and supplementing Decision No. 1579/QĐ-TTg approving the Program on Health Care for Older People through 2030.

7. Livingston G, Huntley J, Liu KY, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. The Lancet. 2024;404(10452):572-628. doi:10.1016/S0140-6736(24)01296-0.

8. Rea BL, Cheema S, Lanza S, et al. Lifestyle Medicine Core Competencies: 2025 Update. American Journal of Lifestyle Medicine. 2026;20(3):443-451. doi:10.1177/15598276251379821.

9. Baker LD, Espeland MA, Whitmer RA, et al. Structured vs Self-Guided Multidomain Lifestyle Interventions for Global Cognitive Function: The US POINTER Randomized Clinical Trial. JAMA. 2025;334(8):681-691. doi:10.1001/jama.2025.12923.

10. Maillard P, Vemuri P, Harvey DJ, et al. Age, Multidomain Lifestyle Intervention, and White Matter Integrity: Secondary Analysis of the POINTER Randomized Clinical Trial. JAMA Network Open. 2026;9(7). doi:10.1001/jamanetworkopen.2026.20353.

11. Office of the National Assembly of Viet Nam. Consolidated Document No. 26/VBHN-VPQH dated 26 February 2026, consolidating the Law on Medical Examination and Treatment.

This article is intended for professional education and general information. It does not provide an individual diagnosis, dementia risk calculation, or treatment plan. Lifestyle interventions may support brain health and help reduce some potentially modifiable risks, but they cannot guarantee prevention of cognitive decline or dementia. People experiencing persistent or progressive memory or cognitive changes should seek assessment from an appropriately qualified healthcare professional. Sudden confusion or new acute neurological symptoms require urgent medical assessment.

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