We don't have such a rule, but luckily, I don't work with any of the fat people here.  I've had to attempt eating at my desk and goddamn it! I take a bite, someone walks up to my desk needing something.  They can damned well see that I have a container of homemade goodness that is still steaming. Does that stop them from pestering me for so long that my lunch gets friggin cold? No. No it does not. Off topic, but it just happened again this week. I usually go home at lunch and hang out with my doggies.  And eat my leftovers in peace.