Health does not begin in hospitals. It begins in homes, schools, workplaces, neighbourhoods, and policy chambers.

In this foundational chapter of Section 2, we explore the concept of health determinants - the broad constellation of factors that shape population health outcomes. Moving beyond individual risk factors, this framework situates health within nested layers of influence: biological, behavioural, social, economic, environmental, and political.

We examine classical models of health determinants, including ecological frameworks that depict health as the product of interacting systems rather than isolated exposures. Income, education, employment, housing, food security, environmental quality, social cohesion, and access to healthcare are not peripheral - they are central.

The chapter emphasises the distinction between proximal causes (such as smoking or diet) and upstream determinants (such as poverty, marketing systems, urban design, and governance structures). Effective public health strategy requires addressing root causes rather than only their downstream manifestations.

Understanding determinants reframes responsibility. Illness is not solely the result of personal choices; it is shaped by structural context.

This episode lays the conceptual groundwork for analysing inequality, climate change, commercial influences, and access to care in subsequent chapters.

Key Takeaways

* Health outcomes arise from multiple interacting determinants.

* Determinants operate at biological, behavioural, social, environmental, and political levels.

* Upstream structural factors often drive downstream risk behaviours.

* Socioeconomic conditions strongly predict morbidity and mortality.

* Health is shaped by policy decisions across sectors.

* Ecological models provide a systems-based understanding of causation.

* Addressing determinants requires intersectoral collaboration.

* Prevention efforts are more sustainable when root causes are targeted.

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