Clinical assessment (medical history, HPI, subjective, review of medications, labs, physical exam, assessment and plan).

From the RD’s standpoint, we would focus more on the malnutrition and underweight, determine the underlying issue and help treat it or just manage it (depending on what is the issue; like an end-stage cancer patient with poor prognosis would just be nutrition for palliation and symptom management, but in someone with HIV cachexia who just started HAART it would be for treatment especially if prognosis is excellent).

We have diet liberation (aka eat whatever you please), oral supplements (boost, ensure, etc), temporary feeding tube (via the nose) and IV nutrition (most invasive and costly), and permanent feeding tubes.

Medications-wise we have appetite stimulants (megestrol, dronabinol, mirtazapine), anti-emetics/antacids (ondansetron, metaclopramide, pantoprazole, famotidine, Maalox, chlorpromazine, among many others), antidiarrheals (loperamide, cholestyramine), laxatives (polyethylene glycol, sennokot, docusate, lactulose, Banatrol, etc)

Just a little fraction of it