It's a balance thing. A lot of startup founders get into bad habits--all-nighters because they've just gotta launch that new feature (which they rush into production, it breaks everything, and then they have to stay up even longer to roll it back, or fix the problems), eating nothing but ramen and cheap takeout, because they imagine cooking takes too long (though I've found making simple meals at home is more time-effective, generally), etc. Everything takes a back seat to working, which I think is counter-productive. You can't sustain that kind of thing, and when you burn out, you'll burn out hard. If you don't sell the company within the "candle at both ends" phase (however long you can maintain that), you'll hit a brick wall and slow to a crawl for a while (you'll also probably look back on your code and wonder WTF you were thinking).

In short, I agree. You probably should view having your own company as an opportunity to live right, rather than an excuse to live terribly. Maximizing health and happiness is probably not a bad way to work towards success, as long as "happiness" does not involve lots of vacations and living beyond your (probably very limited) means.