You can. I do.
It spikes your insulin and breaks you out of ketosis. Which takes time to get going if you are starting to fast again. So if you eat a keto-focused meal it will be more productive
Some things may be easier or harder to digest.for some particularly after a long fast. I’ve never really had an issue.
I’ve included fresh sourdough or French bread when breaking many a fast, though usually following a high intensity workout. I’m avoiding on this go ‘round because, as someone else said, if you eat enough to boot you out of ketosis, you spend more time in the next fast getting back into it, which diminishes time spent burning fat somewhat.
When i ate bread with my meals, i will say that i did not get the explosive bathroom visit post meal, so there is that.
You just have to choose what will keep you compliant, imo. If taking the bread out meant somehow that you wouldn’t have the motivation to fast, then keep it in there. I’m going to add it back once I’m on more of a maintenance track