Where does fat go when you lose weight?

Your body stores fat until you consume fewer calories than is needed, at which point your body turns to the fat for energy. Triglycerides, or fat cells, provide just that. They are broken down into glycerol and fatty acids which your kidney, liver, and muscle keep, then are broken down even further for the final steps necessary to supply the energy. The heat produced by all this helps to preserve your body temperature. Water, one of the two waste products, is discharged by urinating and sweating. The other waste product, carbon dioxide, is exhaled from your lungs.

And that, kids, is how and where fat goes.