Without seeing the layout you're using, I'll just have to pick a method and be a little more abstract about it. One very easy way to do this is to simply check the "Chip up" box on the Rounds tab during the food break. This has the effect of changing the layout token breaktext to something like "Chip up!". The default layout shows breaktext in the space where the blinds are usually displayed. So by just checking that one box, you'll see "Chip up!" where the blinds are usually displayed during your food break.
Of course, you can use conditions in the layout to display a different screen during the food break, or just some alteration to the screen usually displayed during breaks. All depends on your layout and how you want to do it. Happy to help if you want to do something different than described above.