In order to provide an answer to the question, “What is health?” I have classified the various answers into two general categories. Each side tries to argue for a particular way in which the term ‘health’ ought to be used. On the one hand, philosophers such as Christopher Boorse and Daniel Hausman argue that the ‘health’ concept is best understood as a value-free term belonging to the natural sciences. Under the naturalist conception, the notion of ‘health’ is closely associated with the notions of ‘disease’ or ‘pathology’, where ‘health’ is referring to an objective feature of the world. For naturalists, an organism (or one of its systems) is considered to be healthy when there is an absence of a pathological condition. On the other hand,...