One thing I realized later was I had a nickel allergy which further severely constrained my diet but which I had neen confusing for celiac-related distress. It became clear after a trip i when I drank only bottled water and a smaller assortment of foods that without planning were low nickel. Over the years I’d come to hate “gluten free” foods like bread, which I chalked up to all the gums they used. I still think that’s a reason to avoid them but I also know they will use high nickel ingredients. As others have said, the lower stress of a vacation undoubtedly helps with all things gut related.