When a population grows sicker — fatter, more sedentary, more burdened by preventable disease — who is responsible: the individuals who made the choices, or the state that shaped the conditions in which they were made? By "poor health" I mean the preventable illness linked to diet, inactivity, smoking and alcohol, and by "responsibility" both moral blame and the duty to act. This essay argues that responsibility is genuinely shared, but that its balance shifts according to how free the relevant choices really are: where they are informed and unconstrained it falls mainly on the individual, and where they are shaped by poverty, addiction and marketing it falls increasingly on the state.
The case for individual responsibility is not to be dismissed. Adults choose what they eat, whether they smoke and how much they move, and a society that values freedom must respect those choices even when they are damaging. To deny individuals any responsibility is to treat them as children and to invite an overbearing "nanny state" that polices private life. There is also a practical danger: if people believe the state will always rescue them, the incentive to look after themselves may weaken. Where a person is genuinely informed and free to choose, it is reasonable that they, rather than the taxpayer, should bear much of the consequence of their decisions.
Yet the notion of free choice can be a comforting illusion. The global obesity epidemic illustrates how powerfully environment shapes "choice": the World Health Organization has reported over a billion people worldwide living with obesity, and the problem now grows fastest in places where cheap, energy-dense, heavily advertised food is abundant and healthier options are costly or hard to reach. Addiction removes choice almost by definition, and poverty narrows it severely, since the cheapest calories are rarely the healthiest. When the conditions are stacked against good health, blaming the individual alone is neither accurate nor fair. Here the state's responsibility is strong, because it alone can act on the environment rather than on willpower.
This is precisely where state action earns its place. Governments can reshape the choices people face through measures such as the United Kingdom's Soft Drinks Industry Levy, introduced in 2018, which taxes drinks by sugar content and prompted manufacturers to reformulate with less sugar, and Mexico's 2014 soda tax, introduced in response to very high rates of obesity and diabetes. Such measures do not forbid anything; they make the healthier option the default and easier to choose. Because everyone contributes to and draws on the shared health system, society also has a legitimate interest in prevention, which connects individual habits to a collective cost.
It might be objected that this reasoning excuses individuals entirely and breeds dependency, treating people as passive victims of their surroundings with no agency of their own. This objection has force, and an account that erased personal responsibility would indeed be both untrue and harmful. But sharing responsibility is not the same as abolishing it. Recognising that poverty and marketing constrain choice does not deny that choice exists; it simply implies that the state should make the healthy option affordable and available, so that personal responsibility operates in a fair environment rather than against a stacked one. Agency and circumstance are not rivals but partners.
In conclusion, poor health is the responsibility of neither the individual nor the state alone, and the honest answer to "to what extent" is that the balance shifts with the freedom of the choice. Where people are informed and unconstrained, responsibility is mainly theirs; where poverty, addiction and aggressive marketing distort the field, it passes increasingly to the state, whose tools — from sugar levies to the regulation of advertising — can restore the conditions in which individuals can reasonably be held to account. Responsibility, in short, should weigh most heavily on the state exactly where people are least free to choose.