What is a doctor called that treats obesity? is this a specialty?

Bariatrician: Physicians who perform additional training in the treatment of obesity are called bariatricians. These physicians use nonsurgical treatment such as diet,medication and behavioral modification. They are trained to handle the unique medical needs of a morbidly obese individual. A bariatric surgeon, on the other hand is a surgeon who specializes in weight loss surgery such as the gastric bypass