Lifestyle Medicine vs Preventive Medicine, Integrative Medicine, Functional Medicine and Wellness: What Is the Difference?

Lifestyle Medicine is often discussed alongside Preventive Medicine, Integrative Medicine, Functional Medicine, and wellness. The terms appear in professional education, conferences, clinics, social media, and healthcare marketing. Because they share ideas such as prevention, whole-person care, lifestyle, root causes, and wellbeing, it is easy to assume that they describe essentially the same thing. They do not, although there is genuine overlap among them.

A healthcare professional may draw useful knowledge or tools from more than one of these fields. What differs is the purpose of the framework, the interventions it prioritizes, the population or patient it addresses, how it relates to conventional medical care, and how formally it is defined within a particular healthcare system.

This distinction is especially important in Viet Nam. An international name, qualification, or certification does not by itself create a Vietnamese-recognized professional title, licensed scope of practice, or healthcare-facility category. Healthcare professionals remain responsible for practising within Vietnamese law, their authorized professional scope, and the licensed activities of the facility in which care is provided. The current consolidated Law on Medical Examination and Treatment was issued as 26/VBHN-VPQH on 26 February 2026.

What is Lifestyle Medicine?

The internationally developed core definition describes Lifestyle Medicine as a medical discipline that uses evidence-based therapeutic lifestyle interventions, including a whole-food, plant-predominant eating pattern, regular physical activity, restorative sleep, effective stress management, connectedness, and avoidance of risky substances, to prevent and treat noncommunicable disease and, in appropriate circumstances, support disease reversal.

The six pillars are only part of the picture. Contemporary Lifestyle Medicine also includes clinical assessment, behavior-change science, therapeutic relationships, evidence appraisal, shared decision-making, monitoring, interprofessional care, and quality improvement.

Lifestyle Medicine can therefore operate across the continuum from prevention to treatment. A person at high risk of type 2 diabetes may receive Lifestyle Medicine interventions to reduce risk. A patient who already has type 2 diabetes may use lifestyle interventions as part of active treatment alongside medication and other indicated care.

Lifestyle Medicine should not be understood as an alternative to conventional medicine. Its interventions are intended to be integrated into appropriate healthcare, not used as a reason to delay necessary diagnosis, medication, procedures, surgery, psychological treatment, or other established therapies.

A recent development in the United States

An important professional-development milestone occurred in August 2026. The American Board of Medical Specialties approved a new Focused Practice Designation in Lifestyle Medicine, with the American Board of Preventive Medicine serving as the administrative board. Eleven other American Board of Medical Specialties member boards are participating as qualifying boards.

This is meaningful recognition of Lifestyle Medicine within the U.S. physician-certification system, but it needs to be interpreted accurately. A Focused Practice Designation is not the same as creating a new primary medical specialty, and it does not automatically change licensure or scope of practice outside the United States. In particular, it has no direct regulatory effect in Viet Nam.

How is Preventive Medicine different?

Preventive Medicine has a broader relationship with population health and public health.

Internationally, Public Health and General Preventive Medicine focuses on promoting health, preventing disease, and managing the health of communities and defined populations. It combines population-based public-health skills with clinical approaches to primary, secondary, and tertiary prevention.

This means Preventive Medicine can include epidemiology, surveillance, screening programs, vaccination, occupational and environmental health, infectious-disease control, health policy, population risk management, and the design of public-health programs and systems.

Lifestyle Medicine overlaps substantially with primary prevention because nutrition, physical activity, tobacco avoidance, sleep, and other behaviors can reduce disease risk. But Lifestyle Medicine also emphasizes therapeutic lifestyle intervention in people who already have chronic disease.

Preventive Medicine is not defined by the six Lifestyle Medicine pillars and is not limited to behavior change. A vaccination program, cancer-screening strategy, workplace exposure intervention, or outbreak-surveillance system can all fall within Preventive Medicine even though they have little to do with Lifestyle Medicine.

Preventive Medicine is also legally different in Viet Nam

This is one of the most important distinctions in the Vietnamese context.

Article 11 of Circular No. 32/2023/TT-BYT expressly recognizes the professional scope of bác sĩ y học dự phòng, or preventive-medicine physicians, through Appendix VII. The same Article specifies scopes for medical doctors, traditional-medicine physicians, dentists, medical specialists, and other regulated healthcare titles.

Circular No. 32/2023/TT-BYT is now partially amended, including by Circular No. 25/2026/TT-BYT, which was issued on 30 June 2026 and took effect on 15 August 2026. The existence of the separate preventive-medicine physician scope remains relevant.

Lifestyle Medicine does not currently have an equivalent separately named scope in Article 11. It would therefore be inaccurate in Viet Nam to use “Lifestyle Medicine” and “Preventive Medicine” as interchangeable professional titles. They overlap conceptually, but they do not occupy the same regulatory position.

How is Integrative Medicine different?

The term Integrative Medicine can mean somewhat different things across countries and institutions. The U.S. National Center for Complementary and Integrative Health defines integrative health as bringing conventional medical care and complementary approaches together in a coordinated way, with an emphasis on whole-person care.

The defining idea is therefore integration. A patient might receive conventional medication or rehabilitation while also using an evidence-supported complementary approach such as acupuncture, yoga, or meditation. The goal is coordinated care rather than fragmented care.

That is different from Lifestyle Medicine. Nutrition, physical activity, sleep, tobacco treatment, stress management, and social connection are not included in Lifestyle Medicine because they are complementary therapies. They are treated as therapeutic lifestyle interventions in their own right.

There can still be considerable overlap. Meditation, for example, may appear within an Integrative Medicine program and may also be used as one evidence-based stress-management approach in Lifestyle Medicine. The label matters less than whether the intervention is appropriate, evidence-informed, safe, and delivered within professional scope.

It is also useful to distinguish integrative from alternative medicine. A complementary approach is used together with conventional care. An alternative approach is used instead of conventional care. The National Center for Complementary and Integrative Health makes this distinction explicitly.

How is Functional Medicine different?

Functional Medicine is more difficult to define because the term is not governed by one universal international regulatory framework.

An important neutral perspective comes from the U.S. National Center for Complementary and Integrative Health. It notes that functional medicine may sometimes refer to an approach similar to integrative health, while in other contexts it may more closely resemble naturopathy. This illustrates that the term is not used completely consistently outside the Functional Medicine community.

The Institute for Functional Medicine describes its own model as a personalized, systems-based approach that seeks to understand interacting contributors to disease and considers biology, physiology, nutrition, genetics, environment, lifestyle, and other factors.

There is obvious overlap with Lifestyle Medicine. Both may address nutrition, physical activity, sleep, stress, environmental exposures, patient history, and contributors to chronic disease. But the frameworks are not identical.

Lifestyle Medicine is explicitly organized around therapeutic lifestyle interventions, a defined international competency framework, and six core pillars. Functional Medicine commonly uses a broader individualized systems framework and, depending on the practitioner and setting, may involve laboratory testing, nutritional strategies, supplements, environmental assessment, genetics, and other interventions.

The important point is that the label Functional Medicine does not establish the evidence for a particular test or treatment. Each investigation or intervention still needs to be evaluated on its own scientific evidence, safety, clinical usefulness, cost, and relevance to the patient. The same rule applies to Lifestyle Medicine. Something does not become evidence-based simply because it is called a lifestyle intervention.

Functional Medicine certification changed substantially in 2025 - 2026

The Functional Medicine certification structure is now different from what existed several years ago.

In 2025, the Institute for Functional Medicine established the International Board of Functional Medicine Certification to oversee a new competency-based certification program. In 2026, the new program began operating, with a pilot examination cohort in April and further examination cycles thereafter.

The new program has two credentials, Functional Medicine Certified Professional and Functional Medicine Certified Professional – Medical, reflecting different underlying scopes of professional licensure. The Institute for Functional Medicine states explicitly that these credentials do not grant additional legal or specialty status and do not expand or reduce a practitioner's existing professional scope.

That principle is highly relevant to Vietnamese practitioners as well.

And what is wellness?

Wellness is the broadest term in this discussion and is not synonymous with a medical discipline.

The Global Wellness Institute defines wellness as the active pursuit of activities, choices, and lifestyles that lead toward holistic health. Wellness may encompass physical, mental, emotional, social, spiritual, and environmental dimensions.

It can therefore include many activities that have nothing to do with diagnosing or treating disease, such as exercise, relaxation, spa services, healthy cooking, meditation, travel, social activities, or other approaches intended to improve wellbeing.

There is nothing inherently problematic about this. Supporting wellbeing is valuable.

The difficulty begins when wellness is marketed as healthcare without a clear boundary between the two.

A wellness program may encourage healthy behavior. But the word wellness does not itself establish authority to diagnose disease, prescribe treatment, alter medication, interpret clinical investigations, or perform another regulated healthcare activity.

Similarly, words such as holistic, natural, personalized, and wellness-based do not tell us whether a service or product is supported by good evidence.

The areas overlap more than the labels sometimes suggest

These distinctions should not create artificial walls. A preventive-medicine physician may counsel patients about nutrition and physical activity. A Lifestyle Medicine clinician may use mindfulness. An Integrative Medicine practitioner may emphasize nutrition and sleep. A Functional Medicine practitioner may focus heavily on lifestyle factors. A wellness program may help people exercise or strengthen social connection.

The same activity can therefore appear within several frameworks. What changes is the purpose, professional context, overall model of care, and regulatory or evidentiary framework in which the intervention is being used.

Walking provides a simple example. For someone participating in a wellness program, walking may simply be part of feeling healthier and more energetic. In Preventive Medicine, community-level walking programs may be promoted to reduce cardiovascular risk across a population. In Lifestyle Medicine, physical activity may be assessed and prescribed therapeutically for a patient with hypertension or type 2 diabetes. In Integrative Medicine, physical activity could be one part of a broader whole-person plan incorporating conventional and complementary care. In Functional Medicine, activity may be considered together with nutrition, sleep, laboratory findings, environmental exposures, and other individualized factors.

The behavior can be the same. The framework around it is different.

“Root cause” is not exclusive to any one field

Another common source of confusion is the phrase root cause.

Lifestyle Medicine, Functional Medicine, Integrative Medicine, public health, and conventional medical specialties can all seek to understand the causes and contributors to illness rather than simply suppress symptoms. The phrase does not belong exclusively to one field.

More importantly, chronic diseases rarely have one single root cause. Genetics, biology, age, environmental exposures, social and commercial determinants, behavior, infection, healthcare access, and many other factors can interact.

A scientifically responsible approach should therefore be cautious when anyone claims to have identified “the” root cause of a complex chronic disease.

Finding modifiable contributors can be clinically valuable. Oversimplifying causation is not.

“Whole-person care” is not exclusive either

The same applies to whole-person care.

Lifestyle Medicine emphasizes person-centered care. Integrative health explicitly uses a whole-person framework. Functional Medicine describes itself as personalized and systems-based. Preventive Medicine considers behavioral, social, occupational, and environmental influences on health. Conventional primary care and many medical specialties also increasingly emphasize person-centered care.

Whole-person care is therefore a desirable principle rather than the property of one discipline. The National Center for Complementary and Integrative Health describes whole-person health in terms of interconnected biological, behavioral, social, and environmental domains.

The more useful question is not, “Which field is the most holistic?”

It is: What does this practitioner actually assess and do? What evidence supports the intervention? Is it safe? And are they working within an appropriate professional scope?

That question is much harder to answer with marketing language alone.

What do these distinctions mean in Viet Nam?

The Vietnamese context requires particular care because international healthcare terminology and Vietnamese healthcare regulation are not the same thing.

As of September 2026, Vietnamese medical law regulates professional titles and scopes of practice through the Law on Medical Examination and Treatment and its implementing regulations. Preventive-medicine physicians have an expressly identified scope under Article 11 and Appendix VII of Circular No. 32/2023/TT-BYT, as amended.

By contrast, Lifestyle Medicine, Integrative Medicine, and Functional Medicine do not appear as separately named professional practice scopes in Article 11 of that Circular. Wellness is likewise not a licensed healthcare professional title under that framework.

The same principle can be seen at the facility level. Under Article 39 of Decree No. 96/2023/NĐ-CP, as currently applicable, recognized organizational forms of medical examination and treatment facilities include hospitals and various forms of clinics and health facilities. The regulatory framework does not create separate statutory facility categories named “Lifestyle Medicine clinic,” “Functional Medicine clinic,” “Integrative Medicine clinic,” or “Wellness clinic.” Decree No. 96/2023/NĐ-CP is currently partially effective following later amendments, so it should be read in its currently applicable form.

This does not mean that elements of these approaches cannot be used legally in Viet Nam. A licensed physician may use evidence-based nutrition, physical activity, sleep, and behavior-change interventions within the physician's permitted scope. Other regulated professionals may contribute according to their own training and authorized scope.

Likewise, a properly licensed healthcare facility may incorporate evidence-based Lifestyle Medicine principles into its services without becoming a new legal category called a “Lifestyle Medicine facility.”

The central principle is simple:

The international label does not determine the Vietnamese legal scope.

Integrative Medicine should not be confused with Traditional Medicine in Viet Nam

This distinction deserves particular attention locally.

Traditional Medicine, including Vietnamese traditional medicine, has a defined legal position in the Vietnamese healthcare system. The regulatory framework recognizes traditional-medicine hospitals, traditional-medicine clinics and services, corresponding practitioners, and professional scopes.

The international term Integrative Medicine, by contrast, generally refers to coordinated use of conventional and complementary approaches.

These terms are therefore not interchangeable.

A Vietnamese healthcare organization may coordinate conventional medical care with traditional-medicine services where legally and clinically appropriate. That coordination, however, does not by itself establish “Integrative Medicine” as a separate licensed professional scope or healthcare-facility category under Vietnamese law.

Functional Medicine certification does not create a Vietnamese scope of practice

The same principle applies clearly to Functional Medicine.

An international Functional Medicine credential can document education or competency according to the certifying organization's criteria. The new Functional Medicine Certification Program itself states that its credentials are voluntary professional certifications, do not grant additional legal or specialty status, and do not expand or reduce the holder's professional licensure.

For a healthcare professional in Viet Nam, an international Functional Medicine credential therefore does not independently authorize diagnosis, prescribing, ordering or interpreting investigations, treatment, or other healthcare activities beyond what Vietnamese law and the practitioner's authorized professional scope permit.

Lifestyle Medicine certification should be understood in the same way.

Professional education can strengthen competency.

It does not rewrite healthcare law.

Wellness requires perhaps the clearest boundary

The term wellness is particularly broad in the Vietnamese market.

Businesses may lawfully provide many non-medical activities associated with wellness, depending on their registered business activities and other applicable rules. These may include fitness, healthy cooking, relaxation, hospitality, lifestyle education, and general wellbeing services.

But when a service crosses into medical examination and treatment, the legal framework governing healthcare becomes relevant.

Calling a service “wellness,” “health optimization,” “personalized health,” or another marketing term does not remove regulatory requirements if the actual activity constitutes diagnosis, medical examination, treatment, or another regulated healthcare service.

For organizations and consumers alike, the important question is therefore what is actually being done, not simply what the service is called.

Which approach is “best”?

There is no scientifically useful answer to that question at the level of labels.

A person with hypertension does not improve because a service is called Lifestyle Medicine, Functional Medicine, Integrative Medicine, Preventive Medicine, or wellness. Outcomes depend on whether the assessment is appropriate, the intervention is supported by evidence, the professional is competent, risks and alternatives are considered, follow-up occurs, and necessary medical treatment is provided.

Different frameworks may also be useful for different purposes.

Preventive Medicine is particularly relevant when population health, epidemiology, surveillance, screening, environmental health, and prevention systems are central.

Lifestyle Medicine provides a structured framework for evidence-based therapeutic lifestyle intervention, behavior change, and chronic-disease prevention and treatment.

Integrative Medicine provides a framework for coordinating conventional care with selected complementary approaches.

Functional Medicine offers an individualized systems-based framework that seeks to understand interacting contributors to illness.

Wellness is a broader pursuit of health and wellbeing and often operates outside formal clinical care.

None of these descriptions means that everything practised under a particular label is automatically effective. Evidence still needs to be assessed intervention by intervention.

The most useful questions for patients and healthcare professionals

Instead of asking only, “What type of medicine is this?”, it may be more useful to ask:

Who is providing the service? What are their underlying professional qualifications? What are they legally authorized to do? What does their credential or certificate actually certify? What assessment is being performed? What treatment is being recommended? What evidence supports it? What are the potential harms, alternatives, and costs? Is appropriate conventional care being continued? How will outcomes be monitored?

Those questions work across almost every label.

They are especially useful in Viet Nam, where international healthcare terms can spread rapidly through social media, private education, international certifications, wellness businesses, and healthcare marketing before the terminology has any equivalent formal regulatory classification.

Professional language will continue to evolve. The fundamentals of responsible healthcare should not.

What this means for Lifestyle Medicine in Viet Nam

Lifestyle Medicine does not need to define itself by criticizing neighboring fields. Its credibility will be stronger if it is clear about what it is, what it is not, and what evidence and professional boundaries apply.

For Viet Nam, that means keeping Lifestyle Medicine firmly within evidence-based healthcare, adapting international knowledge to Vietnamese clinical and cultural realities, respecting existing professional roles and referral pathways, and avoiding claims that an international certificate creates a new medical licence, statutory professional title, or independent scope of practice under Vietnamese law.

It also means being comfortable with overlap. Nutrition matters across medicine. Physical activity matters across specialties. Sleep and mental health cross professional boundaries. Social determinants matter to both public health and clinical care. Whole-person care is not owned by any one field.

Lifestyle Medicine's distinctive contribution is not that it discovered healthy living.

Its contribution is the effort to make evidence-based therapeutic lifestyle intervention systematic, clinically responsible, measurable, person-centered, and integrated into healthcare.

That is a more useful distinction than any competition between labels.

Professional and regulatory notice

This resource is intended for professional education and general information. It does not constitute individualized medical advice or legal advice.

International terminology, educational qualifications, and professional certifications do not independently create a Vietnamese professional title, practice licence, healthcare-facility licence, or expanded scope of practice.

Healthcare professionals and organizations in Viet Nam remain subject to applicable Vietnamese laws, licensing requirements, professional scopes, facility scopes, clinical regulations, and other relevant requirements.

Individual investigations and treatments should be evaluated according to their own evidence, safety, clinical indication, cost, and regulatory status rather than assumed to be valid or invalid solely because they are associated with a particular healthcare framework.

References

1. Rea BL, Cheema S, Lanza S, et al. Governance and Update Process for Lifestyle Medicine Core Competencies and Definitions. American Journal of Lifestyle Medicine. 2026;20(7):1116–1123. doi:10.1177/15598276261424740.

2. Grega ML, Shalz JT, Rosenfeld RM, et al. American College of Lifestyle Medicine Expert Consensus Statement: Lifestyle Medicine for Optimal Outcomes in Primary Care. American Journal of Lifestyle Medicine. 2024;18(2):269–293. doi:10.1177/15598276231202970.

3. American Board of Preventive Medicine. The American Board of Medical Specialties Approves New Focused Practice Designation in Lifestyle Medicine, Administered by the American Board of Preventive Medicine. 19 August 2026.

4. American Board of Preventive Medicine. Public Health and General Preventive Medicine.

5. National Center for Complementary and Integrative Health. Complementary, Alternative, or Integrative Health: What's In a Name? National Institutes of Health.

6. National Center for Complementary and Integrative Health. Whole Person Health. National Institutes of Health.

7. Institute for Functional Medicine. Introduction to Functional Medicine.

8. Institute for Functional Medicine. Certification History.

9. Institute for Functional Medicine. Functional Medicine Certification Program: Credentials and Eligibility.

10. Global Wellness Institute. What Is Wellness?

11. Văn phòng Quốc hội. Văn bản hợp nhất số 26/VBHN-VPQH ngày 26 tháng 2 năm 2026: Luật Khám bệnh, chữa bệnh.

12. Bộ Y tế. Thông tư số 32/2023/TT-BYT ngày 31 tháng 12 năm 2023 quy định chi tiết một số điều của Luật Khám bệnh, chữa bệnh, as amended.

13. Bộ Y tế. Thông tư số 25/2026/TT-BYT ngày 30 tháng 6 năm 2026 sửa đổi, bổ sung một số thông tư chuyên ngành y tế.

14. Chính phủ. Nghị định số 96/2023/NĐ-CP ngày 30 tháng 12 năm 2023 quy định chi tiết một số điều của Luật Khám bệnh, chữa bệnh, as currently applicable.

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