I didn't eat very well on vacation but managed to keep it to a modest gain (about 2 pounds). Some of that might be the bloat I get from getting glutened. I hope to get it back down by the weekend. I IF-ed Monday (and plan to on Friday) and am doing shakes only during the days, when hungry, otherwise.
I tried to eat only when hungry on vacation, much to my MIL's displeasure. It didn't always work, especially with dinners. I also IF-ed a few times, but that was more about just not being hungry than trying to fast.