the BF%%% may change, like in the post above, but you have NOT lost actual fat mass.
this is not a theory of mine, to gain weight, muscle OR fat, you need more colories then your body need for maintanace. how is muscle supposed to grow without proper nutrition? and dont say "extra protein"!! when you have an overall calory deficit, to lose BF, and you crank up the protein, the extra protein will go through a process called glycogenesis, where it WILL BE TURNED TO SUGAR!!!!!! no muscle gains! your brain function is more important to the body then gaining muscle, so your body will convert any extra nutrients for the benefit of the brain! which is glycogen.