- Has a documented, unintended loss of >5% of their body weight over the last year or requires nutritional supplements to maintain his/her body weight and/or has chronic diarrhea defined as a complaint of at >/= 50% of stools are non-formed for at least 4 consecutive weeks per patient history. Alternately, must be dependent on a therapeutic dose of antidiarrheals (e.g., loperamide or diphenoxylate with atropine) for control of chronic diarrhea.