I have to disagree. No amount of fat you can consume can compensate for a huge loss of carbs. Carbs are not necessary, and yes your body can function fully on fat. However this does not mean this is optimal for certain goals. Carbs are the muscles primary source of fuel for a reason. It is possible there are some people with odd genetics who can make more use of fat and lose less strength than others. However I know of no powerlifters or strong men going for their max performance who eat a very low carb diet. Most heavily carb load as much as they possibly can. Especially if there is a 24 hour weigh in period. I also know of very few bodybuilders that go ultra low carb in the offseason trying to add muscle. The only times most people hear of ultra low carb diets are when people are trying to lose bodyfat and or stay very lean. I can't recall any bodybuilder saying "time to add mass, I better cut all the carbs out and up my fat." It all depends on what your goals are.
You've never heard? So therefore it doesn't work? Carbs are NOT the body's main source of fuel, and shouldn't be used as such. Bodybuilders want mass, not necessarily muscle mass. Today it's more drugs, and less definition and symmetry. So, if you want show muscles vs. strong muscles, you only need a couple of quarts of ice cream and lots of water, to top off your glycogen supply to get the pumped look the next day for pictures or competition. You don't need carbs to train. They add nothing to muscle tissue proper. You can work longer and harder on a fat fueled diet.
