Birria may not be suitable for people with certain dietary restrictions. The dish contains meat, which is not suitable for vegetarians or vegans. Additionally, some variations of the dish may contain gluten, such as when served with flour tortillas. Those with gluten sensitivities or celiac disease should avoid the dish or opt for corn tortillas instead. It's best to check with the cook or restaurant about the specific ingredients used in the dish to ensure it meets your dietary needs.