When someone sticks to a incredibly low-calorie diet on a permanent basis.
Victoria Beckham aka Posh Spice is suffering from permarexia. Everyday she eats a low calorie diet and never strays from it.
Having the need to be slim. Seeing one self to be thin and at all times be obsessed to maintaining that body image.
Risking ones health in order to maintain certain body image is being permarexic.
Permarexia is the condition of a obsession with being thin.
She is obsessed with constant dieting she must be permarexic.