Yup, the whole point of this is slowing digestion down so fullness lasts longer. Which means appetite shrinks a lot. There's food that used to be a favorite that just holds zero appeal now. Or something gets craved and eaten for a stretch, then suddenly the interest is just gone. Won't even bring it up after that. Found that a banana helped settle nausea for whatever reason, even better with a bit of peanut butter on it.
Agree though, frustrating when nothing sounds appealing but eating more than a granola bar is clearly the right move.