The more recognisable names would be Anorexia, Bulimia, or Orthorexia. These conditions are dangerous to the sufferer and distressing to the people around them. It is critically important to remember that these conditions as they emerge are attempts at a solution (no matter how self destructive that may seem) and if a therapist tries to rush in to tackle them head on the likely effect is to make the client recoil. All people have nine innate needs that if not met in balance will lead us into difficulties never is this more true than with eating disorders:
Security
Status
Control
Privacy
Give and receive attention
Community
Intimacy ( emotional or physical)
Achievement ( the need to feel stretched)
Meaning
Once these needs are addressed and met in balance a client has a safe backdrop to explore other solutions and a therapist can start to separate the condition from the core identity of the sufferer.