Substantial weight loss
(a) Weight loss. Substantial weight loss means involuntary loss greater than 20% of an individual's baseline weight sustained for three months with diminished quality of self-care or work tasks. The term minor weight loss means involuntary weight loss between 10% and 20% of an individual's baseline weight sustained for three months with gastrointestinal-related symptoms, involving diminished quality of self-care or work tasks, or decreased food intake. The term inability to gain weight means substantial weight loss with the inability to regain it despite following appropriate therapy.