I have trusted that our school systems have educated all formally educated wizards and witches on the importance of a healthy diet. This "tyranny" merely makes it so that employees must save their fat cakes for when they get home, as an indulgence, as opposed to a permanent fixture of their desks.
A vegetarian, are you? No wonder you've been looking a little sickly. I suggest more chickpeas and tofu in your diet. I'm sure you'll be interested in the greater variety of vegetarian choices at the canteen. I'll be sure your special needs are met, Nott, and will personally speak with the new caterers.