What is obesity? Doctors define obesity based on a person's "body mass index," or "BMI." For adults, weight and height are used to...

Can medicines help with weight loss? Sometimes. Prescription weight loss medicines work by reducing your appetite or by changing the way...

Author: Robert L Barbieri, MD Section Editors: Peter J Snyder, MD, William F Crowley, Jr, MD Deputy Editor: Kathryn A Martin, MD...