ABSTRACT
In this chapter, we will explore how we dene and measure obesity and then use these denitions to explore the prevalence of obesity and the factors that modify it. I will begin with the use of a ve-level model that reects the historical development of methods used to describe the body and its composition. With this background I will dene obesity and central adiposity and then use these denitions to explore the prevalence of obesity. The rising prevalence of obesity that is evident all around us affects children and adults, affects some ethnic groups more than others, and is worldwide in its scope.
