To be or not to be in a good health

What are the factors that determine health and how can it be improved?
How can treatment be oriented in those sectors where it is both clearly useful and cost-effective?
This document presents the salient aspects of the various lines of research being followed under the Programme for the Health of Populations.
Translated from the book " Why are some people healthy and others not ? " directed by Gérard de Pouvourville.