There is little dispute that childhood obesity is a worldwide public health challenge of major concern. Societal changes have profoundly influenced the behaviours of children and youth. Childhood obesity increases the risk of overweight and obesity in adulthood, making prevention of childhood obesity in early ages important. This book investigates different aspects of childhood obesity, potential causes and different behaviours/determinants that influence childhood overweight and obesity. Models for behaviour change needed for planning public health projects are also included. This book may be useful for academics, including students in public health, health promotion and epidemiology, and also professionals that are interested in this field of research.