When I feel that I have lots of energy, what does that mean in terms of physics/chemistry?

Question

I mean, is it all chemoelectrical energy, and where is the 'output' (to use a computing term)?

And how come I can be conscious of having varying energy levels?

Answer 1

Your brain is limited to detecting levels of sugar, salt, and hormones in your blood stream. Because your brain is entirely responsible for how much energy you feel you have, it can be fooled by certain chemicals (psychoactive drugs) into thinking it has more or less energy in reserve than it really does.

Apart from drugs, high levels of sugar generally produce feelings of high amounts of energy.

The output of this energy is either in the form of heat (which we continuously radiation and conduct to the environment), work (such as lifting objects or moving around), or the generation of energy storage molecules (such as fat reserves).

Answer 2

you have high circulating blood glucose levels?