Final answer:
For tuna and avocado toast, gluten-free bread is an option for those with celiac disease, as gluten can damage their digestive system.
Step-by-step explanation:
The type of bread used to prepare tuna and avocado toast can vary greatly depending on preference and dietary restrictions, and to accommodate people with celiac disease, a gluten-free option is typically provided.
Since wheat-based breads contain gluten, which can cause health issues for individuals with celiac disease, alternative bread made from gluten-free grains or substitutes must be used. Rania, for instance, would choose a restaurant that offers gluten-free options for her toast to avoid the digestive damage caused by gluten.