By virtue of having the loudest voice, they are able to command greater attention and to further assert their dominance even when what they are saying doesn't really make much sense.
You probably already know that you're not supposed to talk with your mouth full of food and of course you want to avoid making loud smacking noises or chewing with your mouth open, so you bother other diners.
You can have a protein shake if that works for you, you can have a protein bar, you can take that with you, have it just before the test, but again, make sure your stomach is not louder than your thoughts.
It's very powerful. And I have to admit, it feels a bit spooky to walk down to the ice in the nights, changing batteries in my sound recorder while being surrounded by these loud, strange sounds.