Abstract: The property of physical health is presented as a model for moral goodness, and a primer on being healthy follows. Healthiness is understood in terms of proper biological function. Conventionalism and relativism, two bugbears of moral realism, are discussed in relation to healthiness and found not to arouse suspicion about the reality of physical health. By analogy, these can be accommodated by moral realism. A discussion of the supervenience and reduction of goodness and health follows, and the chapter ends with a discussion of S. Blackburn's challenge to moral realism based on supervenience.

Keywords: Blackburn, conventionalism, health, moral goodness, moral metaphysics, proper function, reduction, relativism, supervenience,