I'm actually reading "Thinking, Fast and Slow," by Daniel Kahneman, right now. There are all sorts of interesting parallels about brains and energy. Thinking hard (like navigating) takes glucose, but so does self-control (like eating intentionally).
When you give someone a sugary snack between tests of self-control they do better on the next test(!). LOL, I'm not sure if that says how to manage it, or if it means there is no way to win.