Why public health matters today more than ever: the convergence of health and social policy.

We argue that public health matters more today than ever because it is uniquely positioned as a meeting point or fulcrum between health care and social welfare policy perspectives on the social determinants of health. It combines a grounding in the sciences of biomedicine and epidemiology with the moral imperatives of social advocacy. Health cannot be delivered through health care policy alone and neither can social welfare policy ensure the well-being of all citizens on its own. Social policy is at a disadvantage because it does not engender universal consent the way health policy can. While the way that illness should be addressed is debated, it should be addressed to be not contested, as is social welfare for vulnerable populations. The convergence of health and social policy to address the social determinants of health means public health advocacy must explicitly leverage biomedicine to provide materialist and substantive arguments and social welfare to provide the normative and moral arguments. We conclude that a new model of public health advocacy or social lobbying is necessary to effectively raise concerns that health care-focused thinking will not, but with potential heft that social welfare, historically, has not been able to command.