Light - from my experience and what I posted above, I think your intuition is correct. I never would have connected feelings of depression and/or other negative thoughts to diet until changing my diet made these things go away - at least for me. Many who ask me about my diet think I am kooky and say that my experiences are a one-off or an outlier. I beg to differ based on my anecdotal evidence of one and other positive things I've read here where people started feeling better and in fact healed themselves by being mindful of what they eat. Food is a drug and I have no doubts about that. I do believe we have the power to heal ourselves. God bless you.My question was more concrete: this Energy that is needed for life - taking action, having sex, learning new things, fighting with my mother - I always thought of it as a wholly mental thing, and even though I always believed in a synergy of mind and matter, it just never occured to me "having the energy" to do something could actually mean having a biochemical, Biology 101- making ATP in your mitochondria kind of energy.
That's the revelation here for me, and I don't know yet that it's in fact true, but if it is, it can simplify many things.