Nutrition, Lifestyle, Environment and Social Determinants

Introduction

Health is produced not only in hospitals and clinics but also in homes, workplaces, schools, neighbourhoods, markets, transport systems and political institutions. Nutrition, physical activity, tobacco and alcohol use, occupational exposures, housing, air quality, climate, income, education, gender, culture and social exclusion interact across the life course to shape patterns of illness and wellbeing. These influences are often called the social determinants of health (SDH).

For health-care managers, the importance of these determinants is both analytical and operational. A hospital may treat diabetes, asthma or cardiovascular disease, but the incidence and recurrence of these conditions are strongly influenced by food environments, stress, employment conditions, pollution, affordability of medicines and the ability of patients to follow clinical advice. Effective health promotion therefore requires more than individual counselling. It requires coordinated action involving communities, employers, schools, urban planners, food systems, public agencies and health services.

This chapter examines how biological, behavioural, environmental and social factors influence disease. It also develops an equity-oriented approach to designing, implementing and evaluating prevention programmes.

Learning Objectives

By the end of this chapter, the learner should be able to:

1. Explain the relationships among nutrition, physical activity, behaviour, environment and disease.
2. Distinguish individual lifestyle factors from broader structural determinants of health.
3. Apply social-determinants and health-equity frameworks to population health problems.
4. Analyse occupational, environmental and climate-related risks.
5. Design prevention and health-promotion responses that are proportionate, culturally appropriate and feasible.
6. Evaluate interventions using population, equity, implementation and outcome measures.
7. Identify ethical risks, including victim-blaming, discrimination, inadequate participation and unequal distribution of benefits.

1. A Multilevel View of Health Causation

Disease usually results from interacting causes rather than a single isolated factor. A useful analytical distinction is between proximal determinants, which are close to the biological pathway of disease, and distal determinants, which shape exposure to proximal factors.

For example, high blood pressure is a proximal risk factor for stroke. Dietary sodium, obesity, stress, sleep deprivation and physical inactivity may contribute to high blood pressure. These behaviours and exposures are in turn influenced by food prices, work schedules, housing, transport, education, cultural norms and commercial marketing. A clinical model that considers only blood pressure identifies an important intervention point but does not explain why risk is concentrated in some populations.

The social determinants of health

The SDH are the conditions in which people are born, grow, learn, work, live and age, together with the wider forces that shape those conditions. They include:

• governance, laws, economic policy and commercial practices;
• social position, including income, education, occupation, gender, ethnicity, disability and migration status;
• material conditions such as housing, water, sanitation, food security, transport and neighbourhood safety;
• psychosocial conditions, including stress, discrimination, social support and control over life decisions;
• access to health and social services; and
• individual behaviours and biological characteristics.

A central principle is that health inequities are not merely differences. They are systematic, avoidable and unfair differences in health or in the distribution of health resources among social groups.

Life-course and ecological perspectives

The life-course perspective recognises that exposures accumulate and may have sensitive periods. Maternal undernutrition, childhood poverty, lead exposure or disrupted schooling can influence adult disease risk. Conversely, supportive early-childhood programmes may produce benefits decades later.

The social-ecological model locates influences at several levels:

These levels are interdependent. Education may improve knowledge, but knowledge alone cannot compensate for unaffordable food or unsafe public spaces. The strongest health-promotion strategies combine individual support with changes to environments and institutions.

2. Nutrition and Disease

Nutrition includes the intake, absorption and use of energy and nutrients. It affects growth, immunity, cognition, reproductive health, body composition and the risk of both infectious and non-communicable disease.

Forms of malnutrition

Malnutrition includes undernutrition, micronutrient deficiencies, overweight and obesity. These forms may coexist within a household or population, a phenomenon known as the double burden of malnutrition. For example, a child may experience iron deficiency while an adult in the same household has obesity related to inexpensive energy-dense foods.

Undernutrition increases susceptibility to infection, impairs wound healing and contributes to maternal and child morbidity. Deficiencies of iron, iodine, vitamin A, folate and other nutrients have population-level consequences. Overweight and obesity are associated with diabetes, hypertension, osteoarthritis, some cancers, sleep disorders and cardiovascular disease, although body size alone does not determine an individual’s health.

Dietary pathways to disease

Dietary risk is multidimensional. Important pathways include:

• excessive sodium intake contributing to elevated blood pressure;
• high intake of free sugars contributing to dental caries and excess energy intake;
• diets high in saturated and trans fats contributing to adverse lipid profiles;
• low intake of fibre, fruits, vegetables, legumes and whole grains reducing dietary quality;
• food contamination causing acute or chronic illness; and
• inadequate protein and micronutrients impairing immunity and development.

Nutrition advice should therefore focus on dietary patterns rather than single “good” or “bad” foods. A balanced pattern is generally diverse, minimally or appropriately processed, culturally acceptable, safe and affordable. Managers should avoid interventions that assume all households have equal access to refrigeration, cooking facilities, time, money or reliable food supplies.

Assessing nutritional status

At the individual level, assessment may include dietary history, clinical examination, anthropometry and biochemical tests. Body mass index (BMI) is calculated as:

BMI is a screening measure, not a complete diagnosis. It does not directly measure body fat, body-fat distribution, muscle mass, metabolic health or social context. Interpretation varies by age, pregnancy, ethnicity and clinical purpose. Waist circumference, growth charts, nutritional intake, laboratory findings and functional status may provide complementary information.

At the population level, managers should examine food insecurity, school-meal coverage, food prices, marketing exposure, breastfeeding support and the availability of safe drinking water. Routine data should be disaggregated by income, sex, age, geography, disability and other relevant characteristics.

Nutrition interventions

Effective interventions may include breastfeeding support, micronutrient supplementation where indicated, nutrition-sensitive social protection, healthy school meals, reformulation of processed foods, front-of-package information, restrictions on marketing to children, fiscal measures and clinical management of malnutrition. Policy design should consider unintended effects. For example, a food tax may reduce consumption of a harmful product but could place a disproportionate financial burden on low-income households unless revenues support healthy food access or social protection.

3. Physical Activity, Sedentary Behaviour and Sleep

Regular physical activity improves cardiorespiratory fitness, muscular strength, metabolic health, mental wellbeing and functional independence. Inactivity is associated with cardiovascular disease, diabetes, some cancers and depression. Sedentary behaviour—prolonged sitting or low-energy reclining—is related to health risk even among people who undertake some exercise, although the magnitude of risk depends on total activity, intensity, age and health status.

Physical activity programmes should be designed around capability, opportunity and motivation. A recommendation to “exercise more” is weak if a person has no safe place to walk, works several jobs or has a disability without accessible facilities. Effective population strategies include active transport, safe parks, physical education, workplace movement policies and clinical referral to appropriately adapted programmes.

Sleep is also a health determinant. Shift work, excessive working hours, housing overcrowding, noise, artificial light and caregiving responsibilities can reduce sleep quality. Sleep deprivation may impair judgement, mental health, glucose regulation and occupational safety. Health-care organisations should address staffing patterns and fatigue risk rather than treating sleep solely as an individual responsibility.

4. Health-Related Behaviours and Commercial Determinants

Tobacco, alcohol and other psychoactive substances influence morbidity, mortality, family wellbeing and health-system demand. Risk is shaped by dependence, availability, marketing, stress, trauma, peer norms, regulation and commercial interests.

The commercial determinants of health are the ways commercial actors, products and market practices influence health. These may include advertising, product design, lobbying, pricing, sponsorship, supply chains and political influence. The concept is relevant to tobacco, alcohol, ultra-processed foods, gambling, fossil fuels and digital platforms.

Effective tobacco control illustrates a multilevel strategy: taxation, smoke-free laws, advertising restrictions, packaging regulation, cessation services and protection from second-hand smoke. Alcohol policy may combine pricing measures, minimum-age enforcement, licensing controls, drink-driving prevention and accessible treatment. Stigma-based approaches are harmful because they may discourage people from seeking care. Prevention should distinguish commercial accountability from moral judgement of individuals.

Digital health technologies can support reminders, self-monitoring and peer support. However, apps may exclude people without smartphones, collect sensitive data or produce biased risk assessments. Technology should supplement—not replace—accessible human services and community-based action.

5. Occupational Health and Safety

Work can promote health through income, social connection and purpose, but it can also expose people to physical, chemical, biological, ergonomic and psychosocial hazards.

Examples include:

• dust, fumes, solvents, pesticides and heavy metals;
• noise, vibration, radiation, heat and inadequate ventilation;
• infectious agents in health-care, laboratory and agricultural settings;
• repetitive movements, lifting and poorly designed workstations;
• violence, harassment, job insecurity, low control and excessive demands; and
• long hours, night work and insufficient recovery time.

The hierarchy of controls prioritises interventions from most to least reliable: elimination, substitution, engineering controls, administrative controls and personal protective equipment. For example, removing a toxic chemical is generally more effective than relying only on workers to wear masks. Occupational programmes should include hazard identification, exposure monitoring, worker training, incident reporting, clinical surveillance and participation by workers and their representatives.

Managers must avoid shifting responsibility to workers when hazards are generated by organisational decisions. A “wellness programme” cannot compensate for unsafe staffing levels, inadequate ventilation or punitive attendance policies.

6. Physical Environment, Climate and Health

Environmental conditions affect health through exposure, infrastructure and disruption of essential services.

Air, water, housing and urban form

Air pollution contributes to respiratory disease, cardiovascular disease, lung cancer and adverse pregnancy outcomes. Sources include traffic, household fuels, industry, construction and wildfires. Water and sanitation failures facilitate diarrhoeal disease and other infections. Poor housing may expose residents to dampness, mould, pests, extreme temperatures, crowding and injury hazards.

Urban design influences physical activity, road traffic injuries, social connection, heat exposure and access to services. Environmental assessment should therefore be integrated into decisions about transport, housing, energy and land use.

Climate change

Climate change affects health through heatwaves, floods, droughts, storms, wildfire smoke, changing infectious-disease vectors, food insecurity and mental-health stress. Vulnerability is not evenly distributed. Older adults, infants, people with chronic illness, outdoor workers, displaced populations and low-income communities may have fewer resources for adaptation.

Health-system responses include heat-health warning systems, cooling centres, resilient facilities, emergency preparedness, disease surveillance, water security, continuity plans and low-carbon procurement. Mitigation policies may also generate health co-benefits. For example, cleaner energy reduces air pollution, while walking and cycling infrastructure can reduce emissions and increase physical activity.

7. Culture, Gender, Power and Health Inequity

Culture influences food practices, illness interpretations, family roles, help-seeking, trust and communication. Cultural competence should not be reduced to memorising traits about groups. Cultures are internally diverse and dynamic. The appropriate approach is cultural humility: respectful inquiry, reflection on professional power and willingness to adapt services.

Gender norms influence exposure, care responsibilities, occupational risks and access to resources. Intersectionality explains how social positions combine. A low-income migrant woman with a disability may experience barriers that cannot be understood by analysing gender, migration or disability separately.

Health inequities may arise through differential exposure, differential vulnerability, differential access to care and differential consequences of illness. Equity-oriented management asks four questions:

1. Who benefits from the intervention?
2. Who may be excluded or harmed?
3. What resources and decision-making power are distributed unevenly?
4. How will outcomes be monitored across social groups?

A universal intervention may be appropriate, but proportionate universalism means providing services universally while directing greater intensity and resources to groups facing greater disadvantage.

8. Designing Prevention Through an Equity Lens

A practical planning sequence is as follows:

Define the problem

Specify the health outcome, population, place, time period and suspected determinants. Avoid defining a complex social problem solely as individual non-compliance.

Diagnose causes and assets

Combine epidemiological data with qualitative evidence, community knowledge, service data and policy analysis. Identify protective assets as well as risks. For example, community kitchens, trusted leaders and local transport networks may support intervention design.

Select intervention points

Choose actions at multiple levels. A diabetes strategy might combine primary-care screening, affordable healthy food, walking routes, medication access, employer policies and regulation of marketing.

Co-design and assess feasibility

Engage affected communities from problem definition through evaluation. Consider acceptability, cost, workforce capacity, political feasibility, legal authority and sustainability. Participation must be meaningful rather than symbolic.

Implement with fidelity and adaptation

Specify the essential components of an intervention while allowing culturally appropriate adaptation. Monitor reach, dose, quality, unintended effects and implementation barriers.

Evaluate outcomes and equity

Evaluation should include process, outcome, impact and equity measures. Useful indicators include participation by social group, exposure reduction, disease incidence, quality of life, financial protection and distribution of benefits. A programme can improve average health while widening inequalities if advantaged groups benefit first or most.

9. Applied Case: Reducing Diabetes Risk in an Urban Low-Income District

Background

This illustrative case concerns Riverside District, where primary-care data show rising type 2 diabetes and hypertension. Rates are highest among low-income adults, recent migrants and shift workers. Local surveys identify high prices for fresh food, limited safe walking space, long working hours and low trust in health institutions.

Problem

The initial proposal is a six-week education course advising residents to reduce sugar and exercise daily. Community consultations suggest that attendance would be low because residents cannot attend during clinic hours, some lack transport, and several participants have limited literacy.

Analysis

The proposed course addresses knowledge but not the wider determinants. Food insecurity, work schedules, neighbourhood design and language barriers influence the feasibility of behaviour change. A narrow intervention could also stigmatise residents by implying that diabetes is primarily a consequence of poor personal choices.

Approach

The health authority establishes a partnership among primary care, municipal planners, employers, schools, migrant associations and food retailers. The programme includes:

• evening and weekend risk assessment in trusted community locations;
• trained bilingual community health workers;
• referral for blood-pressure and glucose management;
• vouchers and procurement agreements that improve access to healthier foods;
• walking groups and safe-route improvements around housing estates;
• workplace negotiations to provide meal breaks and reduce prolonged sitting;
• culturally adapted cooking sessions; and
• monitoring of participation and outcomes by income, language, sex and age.

Outcome and evaluation

After one year, managers assess reach, attendance, blood-pressure control, changes in food security, physical activity, patient experience and referral completion. They compare results across social groups rather than reporting only an overall average. If participation remains low among night-shift workers, the programme is adapted rather than interpreted as individual failure.

Learning points

The case demonstrates that health promotion is more effective when it combines clinical prevention with changes in access, affordability, working conditions and local environments. It also shows why community participation and equity-stratified evaluation are management functions, not optional additions.

10. Governance, Ethics and Contemporary Practice

Health-promotion programmes raise ethical questions concerning autonomy, privacy, justice and accountability. Population interventions should be evidence-informed, transparent and proportionate. Data collection must follow applicable privacy and data-protection requirements, with clear purposes, secure storage and limited access. Risk prediction systems should be tested for bias because algorithms trained on unequal historical data may reproduce unequal treatment.

Managers should distinguish correlation from causation when interpreting observational evidence. People living in polluted areas may have higher disease rates because of pollution, poverty, occupational exposure or combinations of these factors. Strong decisions triangulate epidemiological, clinical, economic and community evidence.

Contemporary best practice includes health-in-all-policies assessment, climate-resilient health systems, trauma-informed services, culturally safe care, participatory governance and routine equity monitoring. The goal is not merely to add disadvantaged groups to existing services but to redesign systems so that power, access and benefits are more fairly distributed.

Chapter Summary

Nutrition, physical activity, sleep, substance use, occupation and environmental exposures influence disease through biological, behavioural and social pathways. These factors are shaped by income, education, housing, work, culture, commercial practices, public policy and social power. The social-ecological and life-course perspectives help managers understand how determinants interact across levels and over time.

Health promotion should therefore move beyond individual education. Effective responses combine clinical care with supportive food, transport, workplace, housing and policy environments. Equity requires attention to differential exposure, vulnerability, access and consequences, as well as monitoring outcomes across social groups. Community participation, cultural humility, proportionate universalism, ethical governance and implementation evaluation are essential to sustainable prevention.

Key Terms

Social determinants of health: Conditions in which people are born, grow, live, work and age, together with the wider forces shaping those conditions.

Health inequity: A systematic, avoidable and unfair difference in health between social groups.

Health inequality: A measurable difference in health, which may or may not be unfair or avoidable.

Proximal determinant: A factor relatively close to the biological pathway of disease.

Distal determinant: A wider social, economic or political factor that shapes exposure and vulnerability.

Social-ecological model: A framework locating influences at individual, interpersonal, organisational, community and policy levels.

Life-course perspective: An approach examining how exposures accumulate and interact across stages of life.

Malnutrition: Undernutrition, micronutrient deficiency, overweight, obesity or related nutritional disorders.

Double burden of malnutrition: Coexistence of undernutrition or micronutrient deficiency with overweight or obesity.

Food insecurity: Inadequate or uncertain access to sufficient, safe and nutritious food.

Physical activity: Bodily movement produced by skeletal muscles that requires energy expenditure.

Sedentary behaviour: Waking behaviour involving very low energy expenditure while sitting, reclining or lying.

Commercial determinants of health: Commercial activities and market practices that influence health.

Occupational hazard: A workplace condition or exposure capable of causing injury or illness.

Hierarchy of controls: A ranking that prioritises elimination and substitution over engineering, administrative controls and personal protective equipment.

Environmental health: The field concerned with how environmental conditions affect human health.

Climate vulnerability: Susceptibility to climate-related harm shaped by exposure, sensitivity and adaptive capacity.

Proportionate universalism: Universal action delivered with intensity and resources proportionate to levels of disadvantage.

Cultural humility: Continuous self-reflection and respectful engagement that recognises limits to one’s cultural knowledge.

Intersectionality: Analysis of how multiple social positions and systems of power interact to shape experience and health.

Review Questions

Short Answer Questions

1. Define the social determinants of health and give four examples.
2. Why is BMI considered a screening measure rather than a complete assessment of nutritional health?
3. List the five levels of the social-ecological model.
4. What is meant by proportionate universalism?
5. Identify three ways climate change can affect health.

Long Answer Questions

1. Explain how nutrition, physical activity and socioeconomic conditions interact to influence non-communicable disease.
2. Discuss the hierarchy of controls and its application to occupational health management.
3. Compare individual-level health education with population-level environmental interventions.
4. Explain how culture, gender and intersectionality may produce health inequities.
5. Describe an equity-oriented framework for planning and evaluating a health-promotion programme.

Analytical / Application Questions

1. A city reports rising obesity in low-income neighbourhoods. Develop a multilevel intervention and identify indicators for evaluating both effectiveness and equity.
2. A hospital introduces an app-based lifestyle programme, but participation is low among older adults and people without smartphones. Analyse the ethical and implementation issues and propose modifications.
3. During a heatwave, mortality rises sharply among outdoor workers and older people living alone. Design an immediate response and a longer-term climate-health strategy.

Multiple Choice Questions with Answers

Question 1

Which statement best describes a social determinant of health?

A. A genetic mutation causing a rare disease

B. The conditions in which people are born, live, work and age

C. A laboratory measurement of blood glucose

D. A surgical procedure used to treat illness

Correct Answer: B. The conditions in which people are born, live, work and age

Question 2

Why should BMI not be used as the sole assessment of nutritional health?

A. It cannot be calculated for adults

B. It directly measures body-fat distribution

C. It does not capture body composition, metabolic health or social context

D. It is only useful for measuring blood pressure

Correct Answer: C. It does not capture body composition, metabolic health or social context

Question 3

Which intervention is highest in the hierarchy of occupational controls?

A. Providing personal protective equipment

B. Giving workers additional instructions

C. Rotating workers between tasks

D. Eliminating the hazard

Correct Answer: D. Eliminating the hazard

Question 4

Which example best illustrates proportionate universalism?

A. Providing no service to people at low risk

B. Offering a programme to everyone but allocating greater support to disadvantaged groups

C. Providing exactly identical resources to every individual

D. Targeting only people who already have disease

Correct Answer: B. Offering a programme to everyone but allocating greater support to disadvantaged groups

Question 5

Which factor is a proximal determinant of stroke risk?

A. National economic policy

B. Neighbourhood income inequality

C. Elevated blood pressure

D. Commercial food marketing regulation

Correct Answer: C. Elevated blood pressure

Question 6

Which is an example of a commercial determinant of health?

A. A person’s blood group

B. Advertising and pricing strategies for tobacco products

C. A naturally occurring genetic trait

D. A patient’s body temperature

Correct Answer: B. Advertising and pricing strategies for tobacco products

Question 7

What is the main purpose of equity-stratified evaluation?

A. To report only the programme average

B. To determine whether benefits and harms differ across social groups

C. To eliminate the need for community participation

D. To replace outcome measurement with financial accounting

Correct Answer: B. To determine whether benefits and harms differ across social groups

Question 8

Which climate-related intervention is most directly focused on immediate heat protection?

A. A heat-health warning system and cooling centres

B. A long-term reduction in household debt

C. A new hospital billing system

D. A campaign against genetic disease

Correct Answer: A. A heat-health warning system and cooling centres

Question 9

In the illustrative diabetes case, why was education alone considered insufficient?

A. Education has no relationship to health

B. Residents already had complete access to healthy food and safe exercise spaces

C. Structural barriers such as food prices, work schedules and transport affected feasibility

D. Clinical services cannot contribute to diabetes prevention

Correct Answer: C. Structural barriers such as food prices, work schedules and transport affected feasibility

Question 10

Which principle is central to cultural humility?

A. Assuming all members of a cultural group have identical beliefs

B. Memorising fixed characteristics of every cultural group

C. Avoiding communication about culture

D. Reflecting on professional power and respectfully learning from patients and communities

Correct Answer: D. Reflecting on professional power and respectfully learning from patients and communities