this is the same mentality i had while working on my first startup and it's a fallacy. the most productive startup founders i know have activities/interest outside of work and aren't anywhere close to this extreme.

neglecting your health is not a badge of how hard you work. one of my startup investors, chris sacca, recently told me he's weary of founders who don't exercise regularly. exercise is a net gain.

i really urge more people to read this blog post from naval ravikant before launching into endless 14 hour "work" days - http://www.startupboy.com/journal/2005/11/29/the-80-hour-myt...