A solution to this would be to keep the meals and other food items seperate, and have it so the bots are only allowed in an area with the meals. It's not the best solution, but it is the only one that currently exists to my knowledge.

You can set up zones for robots?
I only have the basic robots.

Yes. Once you click on your bot, in the infobox in the bottom left corner there will be an "Unrestricted" box. If you click on that, you can assign them to an animal zone.