I've broken multi day fasts with essentially pizza without the bread. And lots of it. I've also hit the Chinese buffet, Indian buffet and golden corral.
Oddly I have never felt bad in any of those. The common factor was they were all heavy meat oriented. I never walked out of a restaurant feeling worse than when I went in. And it wasn't any normal quantity either. I ate for the next 10 days. I don't know what any of this means.
No symptoms when fasting and none when breaking it.
Oh, I have a left thigh cramp now, unusual for me. Detox sign ??? I will persevere and this time I will also break my fast with cruciferous veggies pureed.
I'll be delivering a knock out blow to the bad microbes in my biome with this fast, then I'll feed the good ones with mashed up raw veggies. Then full on veggies and then onto low carb ketogenic diet.