In the adult body food energy not stored as fat or glycogen is lost as?

Heat.

The body constantly produces heat as a byproduct of its metabolic processes. This heat is lost to the environment through the skin, lungs, and urine. When the body is at rest, the amount of heat lost is equal to the amount of heat produced. However, when the body is exercising, the amount of heat produced increases, and the body must lose more heat to maintain a constant temperature. This is why we sweat when we exercise.