May I practice a preferred diet, such as vegetarian, vegan, etc.?

We have over ninety persons (seminarians, priests, staff) to prepare meals for. Unless it is due to a medically diagnosed condition, we are unable to accommodate special dietary preferences. Accordingly, we expect all seminarians to eat all of the meals prepared for them, even those that do contain meat. This is one of the many rules seminarians need to abide by when living and studying in community.