Now I feel bad that I'm the only one learning something from our exchange. But that is perhaps, as you would say, not my problem.
Yes, I was mistaken about how energy is produced by combustion and digestion, but when I started reading about it, it turned out that the initial idea that macro-cosmic events have corresponding micro-cosmic events wasn't completely wrong.
Chemical reactions do occur in the brain at the level of molecules and atoms, but those reactions show no evidence of the consciousness that we say they produce. One single chemical process in the brain can be any number of cognitive processes in the mind. Perhaps these chemical processes carry information, which might suggest that there are sub-atomic variances that carry different bits of information which the brain assembles into a coherent and conscious mind.
Another angle to approach this from is the idea of objects, as perceived by us in the macro cosmic realm. Quantum physics is the only means we have of "bypassing our senses", revealing a world unbiased by the conditions set by our human perception. The macro-cosmos is primarily a human, metaphysical realm; it's existence is relative to us. We cannot know with any certainty that this perception is valid outside of the human condition.