There was a guy in my gym with gifted genetics, you know that type that claim to know everything about workouts, diet and chemisty. They eat what they want, do not diet to get lean or bulk and they know the best workouts, ...etc. This guy told me that if you stop eating sugar, you would not feel the burn during lifting. He said the burn you feel was due to sugar. I asked if he knew what latic acid was, the by-product of muscle activity. He said bullshit, it was sugar in your muscles and if you stop eating sugar it goes away.