Coconut oil is good brain food, some stuff with brain metabolism you can read about if you search coconut oil alzheimers (which is a disease of brain metaboilism in some ways) you’ll see that coconut oil seems to help some people.
It’s what I use, long version here: Experiment Report : Sugar Loading Prior To Major Work
Tl;dr is fat/sugar combo before major work, coconut oil after. Really helps me.