That's literally what I do to myself though. I'm limited to empty calories because of money and digestion/insulin-spiking reasons. Because the latter is hard,

That's literally what I do to myself though. I'm limited to empty calories because of money and digestion/insulin-spiking reasons. Because the latter is hard, I went keto again since yesterday, and literally starve my body into accepting ketogenesis and glucogenesis as the primary energy pathways for the brain cells. The hard part is a near total shunning of (metabolically useful) carbohydrates. This is however rewarded by a near total lack of importance regarding meal timing. Aminoacids and electrolytes are the only macronutrients I have to balance needs with intake on a timescale of less than a week. After that there are vitamins, and calories in the shape of triglycerides only need to balance enough to prevent structural fat from being fed to brain and muscles and to prevent irreversible tissue stretching from gaining weight too fast (and practically also to ensure jeans etc. fit properly).