Quickly, do you know a lot of fighters? Most of them aren't fat are they. Especially the ones who compete.
I have been running my classes for over 2 years now and maybe 10% of them are above 20% bodyfat, IF THAT.
You are the sum of the 5 people you hang around with, but with fighting you might see the same people night in night out for 5-6 days a week.
Here are just a few reasons why combat sports athletes stay lean YEAR ROUND, effortlessly.