Lifestyle medicine
Lifestyle medicine uses behavioural changes as part of preventing and treating chronic disease. It combines nutrition, physical activity, sleep, stress management, social connection and avoidance of risky substances with conventional care.
Scope and definitions
Lifestyle medicine was first described as a medical discipline in 1999, moving lifestyle change beyond an optional supportive measure towards a therapeutic approach. The Lifestyle Medicine Global Alliance defines it as evidence-based medical practice using predominantly whole-food plant-based nutrition, regular activity, adequate sleep, stress management, avoidance of risky substances and other non-drug approaches to prevent, treat and often reverse non-communicable disease.
National and international organisations define the field with different emphases.
| Organisation, definitions reported in 2025 | Definition |
|---|---|
| Belgian and European Lifestyle Medicine Organisations | A branch of medicine aiming to maintain optimal health and prevent, treat and reverse chronic illness across life stages through evidence-based behavioural strategies that consider equity and sustainability. It develops self-management of nutrition, sleep hygiene, stress, social connection, sexual health, fertility and activity, while minimising substance use and environmental exposures. |
| British Society of Lifestyle Medicine | Evidence-based clinical care using person-centred behaviour-change techniques to improve mental wellbeing, social connection, eating, activity and sleep and minimise harmful substances and behaviours. It addresses socioeconomic determinants and educates around six pillars to sustain change. Its multidisciplinary, multisystem approach works alongside self-care, self-management, social prescribing and group consultations, with clinicians, public-health professionals, researchers, scientists and educators collaborating. It extends to public-health policy and prevention and calls for participation by health professionals, individuals, governments and policymakers. |
| American College of Lifestyle Medicine | A specialty using therapeutic lifestyle interventions as a primary treatment for chronic conditions, including cardiovascular disease, type 2 diabetes and obesity. Certified clinicians prescribe evidence-based whole-person change to treat and, when intensive, often reverse these conditions. Its six pillars—whole-food plant-predominant eating, activity, restorative sleep, stress management, avoidance of risky substances and positive social connections—also support prevention. |
Coaching uses motivational interviewing and a collaborative relationship in which the patient participates in care and decisions. Lifestyle medicine differs from integrative or alternative approaches such as acupuncture or nutraceuticals.
Relationship with conventional treatment
Lifestyle medicine complements conventional medicine as an adjunct to clinical and surgical interventions; drugs and surgery remain necessary for many acute and chronic life-threatening conditions. Behavioural, environmental, medical and motivational principles support its interventions, which can prevent, treat and sometimes reverse conditions sharing risk factors and underlying mechanisms. The approach is intended to improve the effectiveness of conventional treatment rather than exclude pharmacological care. Obesity drugs can produce dramatic improvements for some people, but are not an option for everyone and can have side effects; they do not replace healthy lifestyles.
A predominantly whole-food plant-based diet combined with physical activity, better sleep, stress management, reduced harmful substance use and stronger social connections can improve overall health.
Poor diet, stress, harmful substance use, inadequate sleep, sedentary behaviour and insufficient social support can contribute to chronic diseases including cardiovascular disease, diabetes, dementia, cancer and chronic respiratory disease. Cellular injury through oxidative stress and microbiome dysbiosis can lead to chronic inflammation, providing a pathway between lifestyle exposures and disease. Modifying lifestyle factors can affect diseases associated with chronic inflammation and may have effects beyond the principal non-communicable diseases.
Whole-food plant-based eating
The dietary approach emphasises minimally processed, nutrient-dense vegetables, fruits, whole grains, legumes, nuts and seeds. It minimises or excludes meat, poultry, fish, eggs, dairy and processed animal or plant foods, including sausages, cured meats, refined grains, added refined sugars and oils, and artificial ingredients. Unlike veganism, which can include highly processed plant foods, it emphasises whole foods and may include some animal products. Therapeutic effects appear greater as the pattern approaches entirely plant-based eating.
Predominantly whole-food plant-based patterns include Mediterranean, blue-zone, pescatarian, flexitarian, Planetary Health, DASH, vegetarian and whole-food vegan diets. Typical plate models devote about half the plate to vegetables and some fruit, a substantial part to whole grains, and a protein section to foods such as beans, fish and poultry, with minimal red meat and cheese and still less bacon or cold cuts. EAT–Lancet and blue-zone plate models illustrate this approach.
Changes can be abrupt or gradual: some people initially try entirely plant-based eating and later relax it, while others progressively replace particular foods. Enjoyment of the resulting diet and choosing minimally processed food matter to the transition. Advice offered in 2020 suggested lean poultry or fish three to four times weekly where animal foods were retained, while noting that these were not essential where adequate plant-protein sources were accessible.
Combined with other lifestyle interventions, whole-food plant-based eating can reduce inflammation, modify gene expression and change the microbiome. More fibrous food and less ultra-processed food can shift the microbiome towards fewer pathogenic species while increasing fibre, vitamin, mineral and antioxidant intake. Whole-food plant-based diets can help prevent non-communicable disease and treat or reverse some conditions, including diabetes and hypertension.
Prevention and treatment findings
Prevention estimates cited in 2019 put the proportion avoidable by eliminating non-communicable-disease risk factors at 75% for heart disease, stroke and type 2 diabetes and 40% for cancer. An April 2020 summary gave different estimates and outcomes: most diabetes, about 80% of heart attacks, 50% of strokes and a substantial proportion of cancers.
The Nurses’ Health Study followed 75,521 women aged 38–63 for ten years and estimated that more than 80% of heart disease and more than 91% of diabetes could be eliminated with healthy body weight, regular activity, avoidance of tobacco, more whole grains, fruit and vegetables, and no more than one alcoholic drink daily. The US Health Professionals Study followed 42,847 men aged 40–75 for sixteen years and found similar results. Smaller studies have found whole-food plant-based diets can help treat or reverse cardiovascular disease and diabetes and help treat cancer.
Education, policy and clinical uptake
By 2019, medical universities were adding nutrition and lifestyle education in response to curricular deficiencies and student demand. Harvard Medical School had established a Division of Nutrition in 1996; four US universities were piloting residency programmes; Cambridge was developing a public-health curriculum focused on nutrition, activity and sleep; and Surrey offered a master’s in nutritional medicine. Medical organisations offered national and international board certification, and the American College of Lifestyle Medicine founded the Lifestyle Medicine Global Alliance in 2015 to coordinate organisations and respond to needs in low- and middle-income countries. Members in 2019 included organisations in the United States, Australasia, United Kingdom, Lithuania, Albania, Portugal, Iran and Korea; other bodies included the European Lifestyle Medicine Organization, Institute of Lifestyle Medicine and Plantrician Project.
Funding sources in 2019 included the NIH National Center for Complementary and Integrative Health, the European Commission’s steering group on non-communicable disease, the American College of Lifestyle Medicine, Ardmore Institute of Health, Weil Foundation, Osher Center for Integrative Medicine and ProVeg. Hospitals and schools were adding plant-based options, while businesses including Nestlé, Danone, Unilever and Cargill sought improvements in food quality and sustainability. Canada’s 2019 food guide removed a separate dairy group and recommended half vegetables and fruit, one-quarter whole grains and one-quarter protein foods, including meat, dairy, beans, nuts or seeds. US reimbursement for lifestyle counselling was beginning, following Kaiser Permanente’s advice to physicians to recommend activity and plant-based eating.
Clinical recommendations incorporated related approaches.
- The 2017 US high-blood-pressure guideline recommended DASH as a basic hypertension-management measure.
- World Cancer Research Fund recommendations for preventing and surviving cancer incorporated principles underlying whole-food plant-based eating.
- The 2013 US overweight-and-obesity guideline included plant-based diets among strategies for achieving a calorie deficit.
- The common agenda of the American Cancer Society, American Diabetes Association and American Heart Association emphasised whole grains, legumes, vegetables and fruit while limiting red meat, full-fat dairy and added sugars.
By 2019, publication platforms included The Lancet’s Food in the Anthropocene commission on healthy, sustainable diets, The Lancet Planetary Health launched in April 2017, BMJ Nutrition, Prevention and Health launched in July 2018, American Journal of Lifestyle Medicine, and International Journal of Disease Reversal and Prevention. Lifestyle-medicine and whole-food plant-based conferences were increasing in number and attendance.