I noticed that after coming off my fast that I did earlier today, I ate a little too much and it made me sick. It’s the first time I have ever fasted. And I didn’t eat more than I usually do, but I get the feeling that one has to “ease back into eating”, for lack of a better term.
Also on the show Alone, the contestants are given broth and light food when they end their stay in the wild. Granted they are out in the wilderness for days, weeks, and months at a time and they can encounter starvation. I’m sure there is a similar issue with fasting.
If you’ve been eating a lot less fatty food, that may be enough to change how you digest it, regardless of IF. A bunch of years ago, I started eating a lot less red meat for no particular reason, it was just how things were going. The results of the very occasional hamburger were not pretty.