Grasping the idea that it is the BODY which decides HOW food/calories are used is tough one..fortunately recent videos from LC conferences (one a metabolic one) proved we DON'T have the control we think.

This one explains we always show the FAT storage happening in one direction as in too much food eaten=stored fat..but WHAT IF it's the opposite? The FAT is stored and the body drives hunger to bring more in for t's own reasons...now that's a concept!!! In that case we are simply following instinct driven by deep body wisdom.

https://www.youtube.com/watch?v=Zpi5Lir_eJs
David Ludwig, MD, PhD -- 2016 Metabolic Therapeutics Conference Presentation

https://www.youtube.com/watch?v=n8rrgsABNjE
Jeff Volek, PhD -- Keto Diet Presentation at the 2016 Metabolic Therapeutics Conference
Jeff Volek at his BEST!

And Dr. Fungs "2 compartment theory" makes EASY listening of his complex blog and theories, WELL explained for anyone..even your co-workers and family.
https://www.youtube.com/watch?v=tIuj-oMN-F