The law is a powerful determinant of health. It shapes government policy, constrains harmful corporate conduct and influences population behaviours. No sphere of public health lies beyond its reach, from infectious disease containment and injury prevention to chronic conditions driven by commercial products. Global instruments including the Sustainable Development Goals set targets for universal health coverage, yet realisation requires government legislation. The Ottawa Charter for Health Promotion requires structural action on essential prerequisites: education, food and economic security.
Law also defines and oversees the governance of national and global health institutions, from state agencies to regional and global institutions. The World Health Organization’s Constitution is a treaty governing how it must act, how it is funded, what it can do and what is beyond its reach. The Statute of the African Centres for Disease Control and Prevention is a similar legal instrument.
At the core of public health lie equity and justice, transforming unfair systems so everyone has a fair chance to be healthy. Equity is a key tenet of international human rights law. The WHO Pandemic Agreement is a grand global social bargain that requires equitable allocation of scarce lifesaving products.
The phrase “health is a political choice” means that public health outcomes depend on whether governments and international institutions choose to act. Good health governance requires leaders to create, fund and enforce effective legal tools while monitoring outcomes using scientific evidence. Ultimately, protecting population health demands a commitment to deliberative, transparent and accountable legal processes. What are the political choices that are necessary to promote a healthier future for all?
Tobacco: law’s essential public health value
Tobacco control offers a compelling demonstration of how law can systematically alter the commercial determinants of health. Anchored by the WHO Framework Convention on Tobacco Control, governments translated international standards into binding domestic legal norms. High excise taxes created price barriers that directly reduced consumption, particularly among youth. Statutory requirements for plain packaging and graphic warning labels dismantled corporate branding appeal. Indoor smoking bans codified a legal right to clean air, rapidly shifting societal norms.
Civil litigation proved equally instrumental in shifting power dynamics between states and industry. Court-mandated discovery compelled the disclosure of millions of internal tobacco industry documents, exposing decades of deliberate concealment regarding toxicity and addiction. This legal exposure dismantled the industry’s public credibility, secured historic financial settlements and demonstrated the capacity of courts to hold commercial actors accountable.
Diet and nutrition
Translating legal frameworks to diet and nutrition requires addressing the full architecture of food systems to encompass broader structural, agricultural and environmental determinants. On the demand side, targeted statutory measures reshape food environments: excise taxes on sugar-sweetened beverages create price disincentives, and mandatory front-of-pack ingredient and warning labels neutralise corporate marketing and enable informed decision-making. Complementary regulations banning predatory food and beverage advertising targeted at children further protect vulnerable populations from commercial exploitation.
On the supply and governance side, legal regulation drives structural reform across the food supply chain. Statutory limits on sodium and bans on industrially produced trans fats demonstrate how law can enforce product reformulation, achieving population-wide health benefits without relying exclusively on individual behaviour change. Beyond regulating products, law governs systemic priorities: reallocating agricultural subsidies towards nutritious crops, enforcing health-aligned procurement standards in schools and hospitals, and operationalising the legal right to adequate food to dismantle systemic food insecurity and pervasive inequities.
Alcohol
Alcohol poses a multifaceted public health crisis, driving both acute harms – including alcohol poisoning, intentional violence and unintentional injuries – and chronic disease such as liver cirrhosis, cardiovascular disease and cancer. Legal frameworks address this burden primarily through price manipulation, advertising regulation and availability controls. High excise taxes and minimum unit pricing serve as direct economic disincentives to high-risk drinking; statutory licensing laws limit vendor density, restrict sales hours and strictly enforce minimum purchasing ages.
Legal intervention also targets commercial marketing and safety. Mandatory warning labels counter commercial messaging by informing consumers of carcinogenicity and pregnancy risks, and statutory restrictions on advertising and sports sponsorships limit corporate recruitment of youth. Furthermore, law establishes direct accountability through strict blood alcohol concentration limits for driving and commercial liability frameworks, protecting population health by penalising actions that endanger public safety.
Social media and AI
Social media and AI represent an intertwined public health frontier, where generative models and predictive algorithms are force multipliers for harm. AI accelerates the velocity and targeting of false and misleading health claims, and algorithmic design features exploit developmental vulnerabilities in children and adolescents. There is strong evidence of both mental and physical harms to young people. In response, governments are deploying structural legal controls, including statutory age limits on social media access and school-wide bans on mobile devices to restore cognitive and social environments for young people.
Judicial mechanisms and civil liability are establishing corporate accountability reminiscent of tobacco litigation. Landmark multistate legal actions and landmark corporate settlements – such as recent enforcement agreements with tech giants such as Meta – demonstrate how litigation can compel platform-wide design reforms. Court-enforceable mandates are now establishing daily usage limits, restrictions on notifications during school and overnight hours, mandatory age assurance, and financial restitution to fund public health programmes. By targeting algorithmic architecture and platform liability, legal frameworks provide the necessary leverage to neutralise the digital determinants of health.
Choosing health through law
Public health progress is rarely accidental; it is the deliberate outcome of political choices operationalised through law. As demonstrated by tobacco control, and now applied across food systems, alcohol and digital environments, law remains the most potent tool for countering commercial and structural threats to well-being. Leaving population health to voluntary industry standards or individual choices alone guarantees predictable, preventable harm. Realising equity and justice demands that global and national leaders exercise political will – enacting, funding and enforcing rigorous legal frameworks that prioritise human health over commercial interests.
