How many people have high blood pressure?
How many people have overactive bladder disorder?
That isn't even a comprehensive list of conditions and medications that can cause you to have to pee frequently. It also doesn't address the possibility that if you are wearing PPE, it might take a substantial part of your break time just getting to the bathroom facility, and 30 minutes may not be enough time to do all of that and eat.
Although, given the other posters up above, I'm sure they would just tell people to eat while they're taking a shit or a piss. Might as well, they have a free hand.