That patient did (of course) receive vitamins during the fast. I read somewhere that people who go on hunger strike, consuming nothing but water, die without b

That patient did (of course) receive vitamins during the fast. I read somewhere that people who go on hunger strike, consuming nothing but water, die without becoming completely emaciated: they don't look like chronically underfed people at the end. There are plenty of well-known examples of prisoners dying while on hunger strike: they seem to last about 60 days. If you lost weight for 60 days at a constant rate taken from the 1973 case then you would lose about (456-180)/382*60 =~ 43 pounds. I would guess that most people could survive losing that much weight. But unless your aim is to kill yourself then I would advise not doing it with a hunger strike.