There's a lot of interesting material out there about the cycle of burning blood sugar and then converting to burning fat as well as the anaerobic and aerobic forms of energy burning and lactic acid creation. Without understanding the cycle of energy consumption and where the body gets energy from as other stores are used up you won't understand the effect a diet will have on that cycle.
Just some fairly random search results:
https://www.nomeatathlete.com/burning-fat-for-fuel/
https://www.active.com/cycling/artic...ic-acid-880046
https://www.sciencelearn.org.nz/reso...y-for-exercise