I'm working on some biologically realistic interpretations of fantasy creatures, such as Orcs and Ogres. They're signature superhuman strength has been given a scientifically realistic reasoning to it: Their muscle twitch fibres are more fast-twitch than that of a human, whose muscles have mor slow-twitch
For context, muscle-twitch fibres are categorized into two types: The high-power fast-twitch and the high-endurance slow-twitch. Many species, including most primates, feature more fast-twitch muscles than slow-twitch muscles. They have a higher power output but lower endurance compared to humans, whose muscles are around an entire 50% comprised of slow-twitch muscles (give or take 10% or so).
The biggest benefit of having slow-twitch muscle fibres is a lower energy cost, which in turn can have excess energy stored as either fat or used to fuel the brain (At least, this is my understanding)
However, could a humanoid species with more fast-twitch muscle fibres (like say, comparable to that of a chimpanzee or a gorilla) still maintain something close enough to human-level intelligence? Fast-twitch muscle fibres, due to being higher power, take up more energy, hence their lower endurance. This would leave less room for fat reserves, and more importantly brain fuel.
Is there any special setup that could be used so that a humanoid creature can have both fast-twitch muscle fibres AND human level intellect? I already can imagine compromises such as a higher caloric intake, less endurance, and less capacity to build fat, but would this all truly work? What else would need to change in order for a humanoid species to have intellect comparable to a human?
(When I say "comparable", I mean in terms of comprehension, versatility, vocabulary, adaptability, intellectual capacity, and strategizing. I imagine the traits of their brains might need to be changed too.)
