Originally Posted by
RH Clark
Your body does not always use fat as a fuel source. Cells actually change over time to be more efficient at burning fat but only if fat becomes the cell's main source of energy for a prolonged time.
Seems like you are saying pretty much what I just said.
Though I'll still maintain that the body is always using fat for part of it's energy. Depending on ones level of exertion energy from fat might be a lower or higher percentage of that total. Fat is the one energy source we will likely never run out of.