Originally Posted by
gregf83
The weight loss due to the chemical reactions that create energy is too small to measure. The by-products like CO2 might be expelled but you don't lose weight by expending calories.
Agreed, there is no nuclear fission going on in my body thankfully. Your body renders weight as urine, water and feces.
It chemically converts excess and stores into fuel and the oxidation of this excess is shed via an orifice or sweat gland. Then you lose weight.