Lifestyle and Health Reference Library

Lifestyle medicine is framed as the clinical use of a defined set of lifestyle domains as treatment, not as advice added on top of usual care. Egger (REF-035) sets out the discipline's claim to sit between clinical medicine and public health, and Kushner and Sorensen (REF-060) describe it as chronic disease management rather than wellness. The specialty argument is carried by consensus statements: the follow-up to the Doha Declaration (REF-022), the Hail statement from the Middle East (REF-274), the American College of Lifestyle Medicine position summarised by Patel (REF-094) and the Australasian Society's own description of its domains (REF-303). Sayburn's BMJ feature records the professionalisation, including 40 health professionals sitting the first examination (REF-110).

Lifestyle psychiatry has a smaller but distinct literature. Firth and colleagues' meta-review synthesised 29 meta-analyses of cohort studies and 12 Mendelian randomisation studies across exercise, smoking, diet and sleep (REF-041). The LifePsych Society consensus now sets research priorities for the field (REF-167), Merlo and Vela argue that mental health should sit at the centre rather than the edge of lifestyle medicine (REF-077), and Firth's group has written an introduction for practising clinicians (REF-076). Lived experience counts too: in a survey of 649 Australian adults, 77% were positive about lifestyle medicine for mental illness (REF-103).

What the discipline claims for itself is narrower than the marketing around it. The American College of Lifestyle Medicine has published a framework to standardise how lifestyle medicine data are recorded (REF-528) and updated its dietary position statement (REF-004). Commentators argue the case for a true health initiative rather than a rebadging of existing practice (REF-059), while others position lifestyle medicine as the foundation of modern health care (REF-104) and as prevention, treatment and reversal of disease (REF-458). Translating evidence into real impact, rather than into citation counts, is argued directly in the literature (REF-027), and the intervention evidence for mental health practice is reviewed in its own right (REF-071).

The caveat is honest. Much of the underpinning evidence is observational, so the discipline's standing depends on trials arriving rather than on frameworks.

The evidence for treatment, not only prevention, is now substantial. Clegg and colleagues' Cochrane review pooled 73 randomised trials with at least 4,985 adults and found exercise reduced depressive symptoms (REF-025). Noetel's network meta-analysis went further, across 218 trials and 14,170 participants, and ranked walking or jogging highest (REF-087). Singh's umbrella review covered 97 systematic reviews, 1,039 trials and 128,119 adults, with benefits for depression, anxiety and distress (REF-112). Heissel's meta-regression tested dose and modality across 41 trials (REF-052).

Diet has its own trials rather than only cohort data. SMILES was the first randomised trial to show that dietary improvement reduced symptoms of major depression (REF-384), HELFIMED replicated the finding in an Australian sample (REF-385), and Firth's meta-analysis of 16 trials supports dietary improvement for depression and anxiety (REF-040). The Food and Mood Centre's clinical guidelines set out how to use that in practice (REF-043).

Against medication and therapy the picture is more qualified. Blumenthal's trials found exercise comparable with sertraline in older adults (REF-386, REF-387), but Netz, re-examining the guideline comparisons, urges caution about how far that equivalence is pushed (REF-086).

Practice guidance has caught up with the trials. Clinical guidelines for lifestyle based mental health care (REF-073) and the CANMAT 2023 recommendations (REF-448) place lifestyle within stepped care, and a summary of the intervention evidence sets out what treatment and prevention actually rest on (REF-283). Designing an intervention for a common mental disorder is treated as a design problem rather than a prescription (REF-092), optimising the mental health effects of physical activity depends on how the activity is delivered (REF-125), and exercise remains the single best supported modality (REF-046). Lifestyle psychiatry as a whole extends beyond diet and exercise (REF-096).

The evidence favours circumstance, with choice operating inside it. Marmot's Whitehall studies followed British civil servants by employment grade and found a clear inverse relation with coronary heart disease that held across decades (REF-203, REF-204, REF-205). Job control explained part of the social gradient (REF-206). Fair Society, Healthy Lives turned that into a policy program (REF-207), and the ten year follow-up found life expectancy had stalled and inequalities widened (REF-072).

Mechanisms have accumulated since. Allostatic load, the cumulative physiological cost of chronic stress, is measured across cohorts and rises earlier in disadvantaged groups (REF-158, REF-398). Health behaviours themselves track socioeconomic position, and in Whitehall II they explained part of the mortality gap rather than the whole of it (REF-223). Newer cohort work extends the pattern to dementia (REF-145).

Theory explains why the pattern persists. Social conditions have been described as fundamental causes precisely because they keep producing inequality however the mechanisms change (REF-396), income inequality has a causal review behind it (REF-210), and the Dahlgren-Whitehead model remains the map most used to organise determinants thirty years on (REF-209). WHO's Commission on Social Determinants set the international program (REF-208), AIHW reports the Australian pattern (REF-221), and a systematic account ties social determinants to mental disorders under the Sustainable Development Goals (REF-211). Poverty itself has causal evidence behind its effect on depression and anxiety (REF-443).

Housing, place and policy appear as instruments rather than background. WHO housing guidelines address crowding, indoor cold and heat (REF-134), NICE NG44 sets out community engagement for reducing inequalities (REF-083), and national reports keep measuring the gap (REF-029).

The relationship runs both ways, and is easiest to see in the physical health gap in serious mental illness. The joint position statement from three Australian professional bodies sets out the scale of that gap (REF-034), and the NSW Health guideline translates it into clinical process (REF-089). The gap appears early: an audit of 182 young people with first episode psychosis showed a lifestyle and life skills intervention was feasible in routine community services (REF-026).

Shared mechanisms are the other half of the answer. Inflammation and allostatic load recur across sleep, diet and stress research (REF-115, REF-158, REF-378), and Firth's meta-review pulls the cohort, genetic and trial evidence together (REF-041). In 163,707 Australians aged 45 and older, unhealthy lifestyle behaviours tracked with psychological distress over time (REF-047). Brain imaging in 18,083 UK Biobank adults traced pathways linking lifestyle, environment and physical health to mental health (REF-123).

Clinical guidance on the physical care of people with mental illness is now explicit. The Equally Well consensus statement sets the standard (REF-084), the Lester UK adaptation gives clinicians a cardiometabolic monitoring resource (REF-426), NICE quality standard QS80 covers psychosis and schizophrenia (REF-427), and the consensus on antipsychotic drugs and obesity addresses the medication contribution directly (REF-425). Psychoneuroimmunology supplies the immune to brain mechanism (REF-157), social determinants of psychiatric disorders are documented separately (REF-508), and implementing lifestyle interventions inside mental health care has its own evidence (REF-496) and its own case for routine psychiatric practice (REF-116). Sedentary behaviour is also markedly higher in people with bipolar disorder (REF-450).

The 2026 Exercise Physiologists consensus statement sets out a role in mental health support and recovery (REF-064), but physical and mental care largely remain separate systems.

Behaviour change is hard for reasons the literature can name. Marques and colleagues rebuilt the Behaviour Change Technique Taxonomy as a formal ontology (REF-154), which helps specify what an intervention actually contains. Motivational interviewing based interventions were pooled across 97 trials and 27,811 adults, with modest but consistent effects on physical activity (REF-155). Habit formation takes longer than most programs assume, with wide variation between people and behaviours (REF-156), and self determination theory explains why autonomous motivation outperforms pressure (REF-148).

The method base has been standardised. The behaviour change wheel characterises interventions by capability, opportunity and motivation (REF-399), the behaviour change technique taxonomy lists 93 hierarchical techniques (REF-400), social cognitive theory accounts for self efficacy (REF-402), and the transtheoretical stages of change remain the model most clinicians were trained on (REF-403). NICE guidance on individual approaches sets out what services should commission (REF-428).

Adherence is where programs fail. A synthesis of 64 studies of community dwelling older adults mapped barriers and facilitators through the COM-B model (REF-152), and health coaching improved activity, disability and pain across 26 trials (REF-159). Participation is uneven too, with a review of the factors that determine who takes part in physical activity programs (REF-481).

Services are the second barrier. Clinicians want structure and support rather than one more task (REF-014), and they report their own barriers to raising lifestyle risk in consultation (REF-015, REF-056). Psychologists' own promotion practices vary widely (REF-509), and among 196 mental health professionals, 78% addressed nutrition while 51% had no formal training in it (REF-561). Interventions are also not equally effective across groups (REF-225), which argues for targeting rather than scaling the same program.

Australia has policy across the field, and the register records what exists. Nationally, the National Preventive Health Strategy 2021 to 2030 (REF-007), the National Strategic Framework for Chronic Conditions in its 2017 and 2026 versions (REF-012, REF-010) and the National Obesity Strategy (REF-009, GOV-017) set direction, alongside the National Tobacco Strategy (GOV-011). Movement has its own instrument in the Australian 24 hour movement guidelines (GOV-002), and the National Health and Climate Strategy is on the register (GOV-015).

States and territories differ markedly. South Australia's State Public Health Plan (REF-049), Health and Wellbeing Queensland's strategic plan (REF-050), the Tasmanian 20 year preventive health strategy (REF-118), the NSW performance and wellbeing framework (REF-090) and the ACT Wellbeing Framework (REF-001) show how uneven coverage is.

Gaps are documented rather than assumed: no standalone health equity or social determinants strategy in Victoria (GAP-03), no physical activity strategy in Western Australia or the Northern Territory (GAP-05, GAP-14).

The instruments are denser than a single strategy suggests, and the plan is not only about health portfolios. Alongside them sit the Primary Health Care 10 Year Plan (GOV-018) and the National Mental Health and Suicide Prevention Agreement (GOV-016). Whether those documents actually address the social determinants has been analysed: Australian health policy documents were assessed for how far they take up the determinants (REF-493), and intersectoral action on them was reviewed separately (REF-497).

Whether policy is enough is the harder question. Strategies are long on direction and short on funding, targets and evaluation.

The gap between evidence and practice is documented at every step. Referral, uptake and completion of lifestyle modification programs were reviewed across 29 documents, with barriers appearing at each stage rather than at one point (REF-147). Even in a well defined specialty such as polycystic ovary syndrome, clinicians name practical obstacles to lifestyle management (REF-024). Psychologists report barriers to promoting physical activity despite accepting that it matters (REF-509), and 51% of mental health professionals surveyed had no formal training in nutrition (REF-561).

Time is the constraint clinicians name most often. Applying the time needed to treat to NICE lifestyle guidelines shows the consultation minutes those recommendations imply (REF-003), and clinicians describe wanting structure and support rather than one more task (REF-014, REF-015).

Workforce and funding follow the same pattern. Peers are used widely and the evidence on peer support is mixed once scaled (REF-330), and social prescribing has 18 international economic evaluations, too few and too varied to settle the case (REF-069). Where specialists are scarce, task-shared psychological interventions (REF-273) and community health worker delivered care (REF-338, REF-339) carry the work. Scaling structured lifestyle interventions depends on local infrastructure rather than on referral alone (REF-272), and implementing them inside mental health care has its own implementation evidence (REF-496).

Policy has its own version of the problem. The Productivity Commission's mental health inquiry recorded how often reform stops at strategy (REF-501), the latest reform progress report measures how far it has run (REF-523), and Australian health policy was examined directly for how far it addresses the social determinants (REF-493, REF-497). The register records 14 gaps, jurisdictions without a current instrument in a category they previously covered.

First Nations wellbeing is not the same construct as the one most of this library measures. Colonisation and ongoing coloniality disrupted Indigenous flourishing, and social and emotional wellbeing is described in its own terms rather than as the absence of disorder (REF-326). Measures have been collated and classified, with over 30 Aboriginal and Torres Strait Islander social and emotional wellbeing instruments identified (REF-327), evidence on what works is drawn from community perspectives rather than service data (REF-328, REF-329), Mayi Kuwayu is the first large national longitudinal study designed to measure how culture relates to health (REF-416), and Indigenous cultural health has been reviewed in its own right (REF-194).

Policy theory matters here too. A policy analysis asked which theories of Indigenous and non-Indigenous wellbeing Australian strategies actually use (REF-498), the Health Performance Framework reports the outcomes (REF-222), the Close the Gap Campaign Report is the leading community controlled assessment (REF-415), and the National Agreement on Closing the Gap sets the formal partnership (REF-414).

Instruments are in place across jurisdictions, including the National Aboriginal and Torres Strait Islander Health Plan 2021 to 2031 (GOV-022), the national Aboriginal and Torres Strait Islander suicide prevention strategy (GOV-005) and state frameworks such as Korin Korin Balit-Djak (GOV-074).

The comparison with other cultural frames is instructive rather than decorative. Aotearoa's Māori Health Strategy sets wellbeing in its own terms (REF-521), longitudinal data on Aboriginal and Torres Strait Islander children follows social and emotional development over time (REF-522), community led strategies support implementation (REF-536), and culturally and linguistically diverse populations show how migration shapes chronic disease (REF-271).

Guidelines converge on 150 to 300 minutes of moderate activity or 75 to 150 minutes of vigorous activity a week, with muscle strengthening twice, and they now treat sitting as a separate exposure (REF-135, REF-298). The Australian 24 hour movement guidelines (REF-516), the UK chief medical officers' guidelines (REF-517) and the Canadian guidelines, which fold movement, sedentary time and sleep into one package (REF-018, REF-019), say much the same thing.

The dose response curve is steeper at the bottom than most people expect. Pooled accelerometry across cohorts showed the largest mortality reductions came from moving out of the least active group, with diminishing returns thereafter (REF-374). Low activity carries a measurable share of the national burden of disease (REF-540), and leisure time activity benefits are not distributed evenly across socioeconomic groups (REF-484).

Sitting matters independently. In 91,292 UK Biobank adults wearing accelerometers, prolonged sedentary time tracked with cancer incidence (REF-146), breaking up sitting improved cognitive outcomes across 25 trials (REF-151), and replacing sedentary time with activity reduced symptoms in its own trial evidence (REF-453).

Different groups need different answers. Mind body exercise such as tai chi, qigong and yoga reduced depressive symptoms in adults over 60 across 25 systematic reviews (REF-066), while activity trials in children and adolescents produced a small mental health benefit (REF-068). Physical activity and depression are studied in university students specifically (REF-449), domain matters for dementia risk (REF-541), benefits depend on how activity is delivered (REF-125), participation depends on what programs ask of people (REF-481), and bone health in middle aged and older adults responds to the load involved (REF-507). Exercise is Medicine remains the profession's core statement (REF-429).

Diet is now a treatment question with its own trials. SMILES was the first randomised trial to show that dietary improvement reduced symptoms of major depression (REF-384), HELFIMED replicated it in Australia (REF-385) and Firth's meta-analysis of 16 trials supported dietary improvement for depression and anxiety (REF-040). The Food and Mood Centre's clinical guidelines set out how to use that in practice (REF-043), and the broader literature on nutrition and depression across the life course (REF-036) and on how diet and nutrition affect mental wellbeing (REF-039) supplies the mechanism.

Ultra-processed food carries much of the risk signal. Across 17 observational studies and 385,541 participants, higher intake tracked with poorer mental health (REF-062), in 11,192 Australian adults aged 70 and over in ASPREE it tracked with depressive symptoms (REF-074), and an umbrella review links ultra-processed food exposure with a wider set of adverse health outcomes (REF-061).

Unequal access explains why eating well is harder for some. Australia's 2023 food insecurity data was the first national measurement of the problem (REF-228), food insecurity and mental health are linked in meta-analytic evidence (REF-226), dietary quality falls with food insecurity in United States data (REF-227), and dietary risks remain a leading contributor to death and disability across 195 countries (REF-263).

Commercial drivers are named directly. Trends in ultra-processed food sales document the nutrition transition globally (REF-267), the analysis of tobacco, alcohol and ultra-processed food industries names the shared playbook (REF-420), the World Obesity Federation commentary challenges corporate power in food policy (REF-537), and reducing ultra-processed food in clinical diets has its own trial and practice literature (REF-543). Dietary patterns such as MIND (REF-124) and anti-inflammatory approaches (REF-115) are where the treatment research is heading. Interventions are not equally effective for all groups (REF-225), so the prevention question cannot be separated from the equity one.

The trials establish both directions. Digital cognitive behavioural therapy for insomnia in 3,755 university students improved mental health as well as sleep in the OASIS trial (REF-044), and a meta-analysis of 54 trials with 6,876 participants found improving sleep produced measurable mental health benefits (REF-111). CBT for insomnia held its effect on depressive symptoms across 13,608 adults (REF-168), and combined sleep and circadian interventions produced transdiagnostic effects on depression (REF-144).

Mechanism is the clearest part. Sleep disturbance and extremes of duration are associated with inflammatory markers (REF-378), the role of sleep in depression is traced through review evidence (REF-093), and the joint position statement on managing adult insomnia sets out what six Australian professional bodies expect (REF-117).

Quantity has a U shaped relation with mortality, with both short and long sleep carrying risk (REF-375). Laboratory work showed that modest chronic restriction produced cumulative, dose dependent deficits that participants stopped noticing (REF-376), which helps explain why sleep debt is under recognised. Sleep hygiene advice is widely offered but weak on its own (REF-113), while behavioural and psychological treatments for chronic insomnia (REF-431) and combination treatment (REF-432) are where the effect sizes sit.

Shift work is the population where this becomes structural rather than behavioural, with the first months on shift predictive of later health (REF-180). Consumer sleep technology is now common enough to need a position statement of its own (REF-532), integrating sleep care into psychological practice remains uneven (REF-170), circadian and microglial mechanisms are being mapped (REF-461), and extreme heat cuts both sleep and activity in wearable data (REF-249).

Loneliness behaves like an exposure rather than a mood. A meta-analysis of 90 prospective cohorts with 2,205,199 adults found social isolation and loneliness carried mortality and morbidity risk comparable to established risk factors (REF-190). Loneliness predicted mental and physical ill health over five years in 5,616 Thai adults aged 45 and over (REF-095), social connectedness showed bidirectional links with public mental health across 21,227 New Zealanders (REF-107), and AIHW reports the Australian prevalence and its correlates (REF-278).

Mechanism and measurement come from psychology. Social identity based interventions have a measurable effect on health behaviour (REF-191, REF-192), connectedness has been proposed as a distinct pillar of lifestyle psychiatry (REF-196), a three study investigation links connectedness to health outcomes directly (REF-063), and loneliness shows bidirectional associations with physical multimorbidity (REF-506).

What helps has been tested less well than what harms. Social prescribing was assessed across eight randomised trials and 4,621 adults for chronic disease prevention (REF-193), across 18 international economic evaluations with the economics still unresolved (REF-069), and interventions targeting loneliness were systematically reviewed for what works (REF-195). NICE NG44 sets out community engagement as the mechanism for reaching people (REF-083), and volunteering in later life has its own mixed evidence base (REF-452).

Australia has a national strategy in Ending Loneliness Together (REF-037), which argues for structure rather than advice. Internationally, Wales has recognised social connection as a public health priority (REF-525) and WHO has convened a commission on it (REF-527).

The focus reflects where the evidence sits. Tobacco and alcohol have five decades of cohort work behind them; the 50 year follow up of British male doctors established smoking as a cause of lung cancer and much else (REF-351). Alcohol has national guidance setting three guideline levels of risk (REF-082), updated Canadian recommendations for conversations in practice (REF-017), and WHO's SAFER progress report on the measures that reduce harm (REF-140). Tobacco has the Framework Convention, the only binding global health treaty of its kind (REF-410).

Both sit inside Australian frameworks rather than beside them: the National framework for alcohol, tobacco and other drug treatment (REF-006), the National Tobacco Strategy (GOV-011), the vaping reforms (GOV-007), the National Alcohol Strategy (GOV-026) and the National Drug Strategy (GOV-029).

Reporting and monitoring follow the same two substances. AIHW reports alcohol, tobacco and other drugs together (REF-280), the SNAP population health survey tracks smoking, nutrition, alcohol and physical activity as one set of risks (REF-120), and the national stigma and discrimination report card records how people who use drugs are treated (REF-085).

Other substances appear in only about five records, and that asymmetry is the finding. Lifestyle interventions for substance use disorder are reviewed for Australian general practice (REF-585), and a separate paper argues that lifestyle and addiction medicine belong in the same consultation (REF-586). Medicinal cannabis for mental disorders was reviewed with a clear finding against it (REF-588), and pooled evidence tracks cannabis use in young people with depression, anxiety and suicidality (REF-590). Stigma remains the main reason other drugs are handled differently (REF-593).

Above all of this sits the commercial layer: the commercial determinants of health are now a defined field (REF-419), and the analysis of tobacco, alcohol and ultra-processed food industries names the shared strategies (REF-420).

Prevalence frames the question. Pooled data from 3,663 population studies with 222 million participants show obesity has risen almost everywhere since 1990 (REF-265), AIHW reports two thirds of Australian adults above a healthy weight (REF-279), and the World Obesity Atlas projects the childhood picture forward (REF-535).

Management has become more medical. The 2026 standards of care treat obesity as a heterogeneous chronic disease (REF-286), the Australian obesity management algorithm gives general practitioners a practical route (REF-293), NICE NG246 covers prevention and treatment together (REF-300), and the 5As framework of ask, assess, advise, assist and arrange remains the primary care structure (REF-292).

Lifestyle has shifted from cure to component. Pharmacotherapy guidelines frame weight loss as a pathway to health rather than a goal in itself (REF-302), dietary interventions for type 2 diabetes are reviewed in their own right (REF-284), and remission of type 2 diabetes is now a defined outcome with HbA1c below 6.5 percent sustained without medication (REF-289, REF-312). The DiRECT trial showed primary care led weight management can achieve remission (REF-304), and its five year follow-up shows how durable that is.

The new medicines change what can be offered. WHO has issued conditional recommendations on GLP-1 medicines for adults with obesity (REF-297), and the cardiovascular outcome trials for semaglutide (REF-314) and tirzepatide (REF-315, REF-317) moved these drugs from weight loss to risk reduction. Weight regain after withdrawal is documented (REF-318), pooled analyses of cardiovascular, mortality and kidney outcomes are now available (REF-323), and effects on fat mass, lean mass and muscle function are being measured (REF-325). Whether lifestyle keeps its place alongside these treatments, or becomes the adjunct, is the live question.

Nature exposure has both a dose and an equity finding. About 20,000 English adults showed that at least 120 minutes a week in nature was associated with good health and wellbeing, with no benefit below that threshold (REF-133). A scoping review of 123 studies asks whether nature is equigenic, narrowing rather than widening health inequalities (REF-028), green space studies in older people point the same way (REF-130), a cluster randomised trial of outdoor schooling found benefits for children (REF-187), and nature based social prescribing has been trialled as a delivery model (REF-544). The framework linking natural features to mental health comes from the ecosystem service literature (REF-016), and nature connectedness is studied as its own construct (REF-186).

Heat is the sharpest edge. An ecological study of 171,614 hospital admissions and 2,599 deaths in a temperate Australian city linked heat waves to mental and behavioural disorders (REF-231), psychotropic medications increase heat vulnerability through impaired thermoregulation (REF-232, REF-233), and systematic reviews of ambient temperature and hot weather reach the same conclusion (REF-229, REF-230). Wearable sensing showed extreme heat cutting both activity and sleep (REF-249).

Cold and displacement do the same in the other direction. The health impacts of cold homes and fuel poverty are documented in their own reviews (REF-236), climate anxiety is measurable across 35 studies and 45,667 adults (REF-239), and disaster research traces psychological outcomes after the Victorian bushfires (REF-241) and a decade later (REF-242), alongside the English cohort study of flooding and health (REF-243).

The National Health and Climate Strategy is the policy instrument (GOV-015), and the Lancet Countdown reports annually on how far health systems have adapted (REF-250).

Needs change shape across life, and so does the evidence. In children and adolescents, physical activity trials produce a small mental health benefit (REF-068), school based programs moved outcomes only when they were health focused rather than general activity (REF-198), brief school based interventions and whole programme approaches are reviewed separately (REF-201, REF-202), and family based interventions for childhood obesity improved parental and offspring outcomes across 20 randomised trials (REF-199). Physical activity and cognitive performance are studied in early childhood (REF-200), WHO has issued guidelines on managing obesity in children (REF-510) and adolescents (REF-511), and the Early Years Strategy covers the earliest part of this sequence (GOV-008).

In later life the questions change from prevention to function. Exercise and diet support brain health through physiological pathways (REF-055), mind body exercise reduced depressive symptoms in adults over 60 across 25 systematic reviews (REF-066), multimorbidity patterns predict mobility disability in frail adults over 70 (REF-126), and WHO Europe's report on promoting activity and diet for healthy ageing argues that later life still shapes future health (REF-143).

Midlife is where prevention may pay most. Multidomain lifestyle interventions for cognitive decline have their own trial base (REF-539), the Lancet Commission on dementia prevention sets out the modifiable share (REF-413), WHO guidance on reducing the risk of cognitive decline follows the same logic (REF-139), lifestyle predictors of healthy ageing are tracked in cohort studies (REF-472), and Mediterranean diet evidence sits alongside them (REF-465).

Adherence is where age specific programs succeed or fail, and 64 studies of community dwelling older adults map the barriers and facilitators (REF-152).

Treatment and public health ask different questions of the same evidence. Rose's distinction between sick individuals and sick populations remains the clearest statement of it: clinical care identifies the people at highest risk, while population strategy moves the distribution that produced the risk in the first place (REF-394). The policy lineage runs through Lalonde's framing of health determinants (REF-406), the Declaration of Alma-Ata on primary health care (REF-404) and the Ottawa Charter for health promotion (REF-405).

The instruments differ accordingly. Australia's National Preventive Health Strategy sets population direction (REF-007, GOV-019), and the WHO action plans on noncommunicable disease, physical activity and mental health do the same internationally (REF-407, REF-408, REF-409), as does the Lancet Commission on global mental health (REF-411). Clinical guidance works at the other scale, and its cost in clinician time is now measured explicitly (REF-003, REF-058).

Lifestyle change is where the two meet and often fail. Task-sharing and community health worker models deliver psychological and lifestyle support where specialists are scarce (REF-338, REF-339), community based healing programs show how the setting carries the effect (REF-336), and scaled structured lifestyle interventions depend on local infrastructure rather than referral alone (REF-272). Community engagement is the mechanism NICE recommends for reaching the people least served (REF-083), and the economics of social prescribing are still unresolved across 18 evaluations (REF-069).

The caution is that population programs can widen inequalities when they reach the already advantaged first (REF-224), and the commercial drivers of poor health sit above any individual consultation (REF-419).

The field's frameworks are international before they are national. The WHO comprehensive mental health action plan (REF-409), the World mental health report (REF-433) and the Lancet Commission on global mental health (REF-411) set shared goals, with WHO guidance on mental health across government (REF-045) and at work (REF-183) translating them into other sectors.

Physical activity guidance is the most convergent area. The WHO 2020 guidelines on activity and sedentary behaviour (REF-135, REF-298), the Canadian 24 hour movement guidelines (REF-018) and the UK chief medical officers' guidelines (REF-517) agree on dose. Alcohol is the opposite case: Canadian recommendations pushed toward lower risk thresholds (REF-017) than the Australian guideline levels (REF-082).

Measurement and burden are where comparison gets harder. WHO's European review of the social determinants (REF-438) and national surveys in Malaysia (REF-253) document patterns that global series describe only in aggregate: dietary risk in 195 countries (REF-263) and worldwide obesity trends (REF-265). Metabolic reporting from India (REF-258) shows how quickly those transitions are running in middle income settings.

Professional and cultural framing varies as much as the data. The Doha white paper (REF-022) and the Hail consensus statement (REF-274) show regional developments in lifestyle medicine, Aotearoa's Māori Health Strategy sets wellbeing in its own terms (REF-521), and Wales has recognised social connection as a public health priority (REF-525).