Withhold food from a family member. I still don't know if I could do that. I think it might be because I know better than most that allopathic medicine is not what it is commonly understood to be. It's an experiment - and not too damned good of one at that. Most people (no implication for the folks here) believe physicians actually know why they are doing what they do when caring for a patient. In addition, most hold that physicians understand what their treatments do. That this attitude is prevalent is indicative of how successful the Memorization Doctorates have been at conning the public. What your typical md knows is: Patient exhibits symptoms X, Y and Z. The PDR says (or the OTJ training they got as residents and interns) that in such a case we do treatments A and B. Ask them why and the honest response is that of 1,000 people with symptoms X, Y and Z treated with A and B, 700 got better, 200 didn't get worse and only 100 died.
With so much knowledge lacking among our medical "professionals" I can't see how I could ever be convinced by them that starving a relative was the "best" course of action.