72 hours isnt enough for you to have to worry about it. I don’t know the specific mechanism off the top of my head but its not something to do with “resetting” nutrients. Ive been doing them for a few weeks now. I broke my fast today with ahalf of a leftover steak, then had 4 sushi rolls and fried tempura.
Ive done pho (go easy on the chili paste) and even a large papa murphys thin crust. Did not do anything special, just shoveled food in my mouth.
The term refeeding syndrome appears to be overused here.