It goes from the fat cells to almost every cell in your body. In these other
cells it gets metabolized (burned) and ends up as carbon dioxide and water.
The energy that was in the fat is put into another compound called adenosine . (quote from nutrition help web site)
In other words, energy is being extracted from fat for your body to acccomplish it's regular duties (Move, digest, pump blood through each part of your body) What is not being used from the fat is expelled while urinating or doing number 2