Bariatrics is the branch of medicine that deals with the causes, prevention, and treatment of obesity. Overweight and obesity are raising medical problems of pandemic proportions. There are many detrimental health effects of obesity: Specifically, individuals with a Body Mass Index or BMI exceeding a healthy range have a much greater risk of a wide range of medical issues. These include heart disease, diabetes, many types of cancer, asthma, obstructive sleep apnoea, chronic musculoskeletal problems, etc. There is also a clear effect of obesity on mortality, though this is not so clear for those who are overweight.