And it's worth noting that having some fat is good. I can get it when you're a startup and you're trying to pull yourself up by your bootstraps, but at some point of time you need some fat. Too much fat is bad, but no fat is also bad. Startups run lean because they have to but when big businesses run too learn, it's called anorexia.
Another way of looking at it is that fat serves a purpose in the body. It's true that if you're optimizing for a very narrow outcome, very low (but not no) fat bodies can look ideal, but for one thing, that's actually a pretty unhealthy body, and for another, the best weight lifters in the world actually have pretty substantial fat reserves to support and sustain their muscles.
No fat can help for going fast and efficient, but it prevents you from going strong.
And it's worth noting that having some fat is good. I can get it when you're a startup and you're trying to pull yourself up by your bootstraps, but at some point of time you need some fat. Too much fat is bad, but no fat is also bad. Startups run lean because they have to but when big businesses run too learn, it's called anorexia.