You're probably wondering why you've never heard about Prader-Willi syndrome before. There is a simple reason for it, and that is that it's quite rare. Prader-Willi syndrome is a genetic condition that can affect anyone, and manifest itself through physical symptoms, learning difficulties, and behavioral problems. But there is one particular symptom that this rare symptom is known for: an insatiable appetite.
Click through the following gallery and learn more about Prader-Willi syndrome.