I'm not saying you'll be dead in 5 years time if you spend more than 12 hours a day sitting on a chair programming. But it adds up if you're doing that your whole lifetime and neglect healthy food and physical activity. Of course it differs from person to person but I think you see my point.

Regarding stress free comment... I guess it depends on the person in question. Besides, when you finish for the day, you really finish for the day and that's the most important thing. Entrepreneurship is not for everyone.

Smart people will put health before entrepreneurship, especially if it prolongs their life and not just in the sense how many years will they have to life.