This document provides an overview of chapter 1 of the textbook "HLTH 2400 – Determinants of Health Behavior" which covers definitions of health, determinants of health, and leading causes of death. It defines health using the WHO definition of complete physical, mental and social well-being, not just the absence of disease. It also discusses more contemporary perspectives that view health as having multiple dimensions and as existing on a continuum. Additionally, it outlines two views that health can be focused on capacity/abilities or illness/disease, and provides US statistics on life expectancy and mortality rates.