I'm thinking of what I used to hear about Beethoven, being so involved in his composing that he couldn't be disturbed by eating, people bringing him food.
Was there anything else he didn't do? Like normal stuff. I'm figuring the bathroom situation wasn't the greatest back in those days, maybe a chamber pot or a chair you flipped out from the window. Or maybe they had Murphy bathrooms that you flipped down out of the wall. That'd be great till it was time to flip it up again.
I've never been a composer so I don't know how distracting it'd be to eat or go to the bathroom.