It's called Mania

And it can be induced by bacteremia as a result of surgical procedures. 

'Breatharian' Barbie Valeria Lukyanova Says She Wants To Live Off Light And Air Alone

"In recent weeks I have not been hungry at all," Lukyanova said, according to the International Business Times. "I'm hoping it's the final stage before I can subsist on air and light alone."
The website linked that dietary desire to a New Age practice known as Breatharianism, in which followers neither eat nor drink, believing they can exist solely on "cosmic micro-food."

Self Injury is the hallmark behavior of autoimmune OCD. 
I'm guessing her teeth are all fake too...

related post