What Causes Hypothalamic Obesity?

Alexis, 12, has developed hypothalamic obesity after being diagnosed with a rare brain tumor that damaged her brain and caused it to "think" she's starving. Learn what her life is like today. E.R. physician Dr. Travis Stork explains the cause of Alexis' rapid weight gain. And, pediatrician Dr. Jim Sears explains the complications of hypothalamic obesity. Plus, what other disease is Alexis battling?