A more serious case of anorexia, where the person in question, as well as always trying to lose more weight than is healthy, thinks they are morbidly and disguistingly obese.
A phanorexic person will often compare themselves to something equally as fat, such as an overweight whale for example.
Person suffering from phanorexia:
"I've got so much flesh! Bleeugh. I look like a really really fat whale or something. At this rate, I'll die of morbid obesity."