We also shed flakes of skin and hairs, excrete pieces of destroyed cells, leak lipids through our pores, and eventually every part of our body will return to dust.
C in = C out
Your body is not a 100% efficient machine. Not everything you eat gets absorbed. Not everything you absorb gets converted. Not everything you convert gets used for Krebs cycle. The Krebs cycle itself involves quite a few molecules. Even if you're a full grown adult that never gains muscle or fat, you have a constant rebuilding effort going on and tons of chemical messengers that need to be made.
Balanced chemical equations are Chem 101. You can't balance an equation until you have all the variables. Anything less is just a huge guess. Take Organic Chem and Anatomy & Physiology and then you can talk about chemical equations in the body.
Edited by FuNkDrSpOt - 1/20/11 at 6:10pm