Anorexia

Anorexia is an emotional disorder characterized by an obsessive desire to lose weight by refusing to eat, which can result in possible health risks.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Empath dealt with Smurfette choosing to go on a diet by undereating, which resulted in her breaking her ankle when she fell through a hole that appeared in her house when she and Empath were bringing back her laundry.