There are several institutes who have conducted research on obesity, including the National Institutes of Health, Johns Hopkins Medicine, and the National Heart, Lung, and Blood Institute. Research typically focuses on causes, treatment and prevention.
The National Institutes of Health website contains information about obesity treatment and how to prevent it. There is also information available to help understand the cause of obesity and the health risks involved. As of 2015, Johns Hopkins Medicine has been conducting research on obesity for at least 20 years. They take a more statistical approach. The National Heart, Lung, and Blood Institute offers funding to assist researchers who are collecting data on factors that cause obesity.