I know it's hard working on a building site, but I've done it & I used to get a lunch break & a quick couple of breaks throughout the day too.
Make some sandwiches up, or some pasta & get them down you on your lunch/breaks. Meanwhile, when your on your next trip up the ladder, quickly down a shake.
It can be done. Even the 'toilet' breaks works a treat. There's loads on here that sneak to the bog for a munch!
