I recently posted a topic about fat metabolism which saw a good number of quality responses. I'm hoping that we can have the same good conversation about protein.
I have a good understanding of how protein is used as a so called building block for our bodies. Many very important structures in our bodies are made up of protein, such as enzymes, cellular receptors, and of course muscle fibers.
However, I am clueless about how our bodies use protein as a fuel. So here we go with the questions:
1. When does the body use protein as a fuel? Is it during normal activity or more vigorous exercise?
2. Does it convert the protein to energy, such as how carbos are converted to ATP for energy?
3. Or, is the protein used just to repair that protein that is lost from the body due to damage from exercise?
4. That being said, does said "damage" actually occur, i.e. micro tears in muscles and such? I do know that enzymes and other cellular structures are constantly being torn down and replaced, is that true with muscles?
5. Where does the body get its source of protein? From the body then diet replaces that or can it utilize protein directly from our GI system?
I'm sure I will have more questions later, but that's enough to hopefully get some good knowledgable responses in the meantime.