My name isn't Mark, but...
You cannot change a fat cell into a muscle cell through any mechanism--that would be like turning an arm into a leg.
My understanding is that you have a (mostly? totally?) fixed number of fat cells, and gaining fat weight causes each individual fat cell to increase in size. So losing weight is about shrinking fat cells and building new muscle fibers.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food