Do you have any dietary restrictions?
I'd split dietary restrictions into several categories:
Ethical-based (e.g. animal rights or welfare, environmental concern)
Nutrition or Health-based (e.g. gluten free, low carb, no red meat)
Religious-based (e.g. kosher or halal)
Cultural-based (e.g. cultural taboos)
Other personal reasons
I'd say if I have any dietary restrictions they would be a mix of ethical, cultural, and personal (like not eating human meat for instance.)