Cool. You give a nice explanation of energy use by the body. ( was feeling the cobwebs being removed when you talked about the sytems)

I will say that anyone who does make changes need to make sure that they drink plenty of WATER.
LACTIC acid can also build up in the muscles after exercise if a person is dehydrated.
It is important that people drink small amounts during exercise.
"Hunger pains" can sometimes be dehydration.

actually there is a lot that can be said about the benefits of water after my brief ramble.