64% of american adults are overweight (bmi>25) or obese (bmi>30) 25% of american children are overweight or obese. 13% of canadian children are now considered obese. The prevalence has doubled over the past two decades. **bmi = body mass index (takes both weight and height into account but not perfectly accurate) rates of obesity have really increased over time. rates tend to be higher in boys. Associated with health problems (e. g. cv disease, diabetes, high blood pressure, and high cholesterol) associated with availability of fast foods (which are cheap) and certain activities (like video games, text messaging) Obesity costs the us 100 billion dollars annually and causes 300 000 deaths annually. Obesity itself is not a mental disorder, though it can be the result of one. There has been a parallel increase in the prevalence of dysfunctional eating practices, including eating disorders, and unhealthy weight loss.