Hi Zippy
It depends to some degree on where you are going - countries such as the US will be a lot more aware of food allergy issues, whereas poorer countries might not be.
But if you can let our Holiday Advisors know by calling us on 0844 567 8838 (if you haven't already), we will do our best to plan ahead for you.
It's a good idea to pack a few gluten-free snacks in case there are any instances where no suitable food is available.
Kind regards,
Olly, your editor