I never eat at work, so I usually go outside alone on my breaks and smoke on the pallets next to the building. A coworker once said I looked like I was pretty sad over there, but I never really thought of it that way. I just like my thoughts.
Plus, I get to people-watch all of the people coming out of the other stores, so it’s pretty entertaining.
I have the option of working through lunch, which I used to do when I was at our big building with my own office and a ton of people around. That is to say, nobody noticed if Junior Flunky kept to herself at the computer.
However, I have been since transferred to a much smaller division office and my supervisor likes us to actually stop what we’re doing and take a half-hour lunch break. Dude, he’s the boss; who am I to argue? Some rules are not official but just as important to follow.
So I stop for lunch now. I actually don’t eat a whole lot (just me and my chicken breast and avocado half), so I usually spend the additional twenty minutes or so sweating it about the work I could be getting done.
I generally prefer to eat alone at a corner table in the break room. It probably makes me look antisocial and kind of suspect, but my coworkers and supe seem to be cool with it. Like FCM, we can’t have personal cells, laptops or the like onsite, so I just eat and worry. Hey, worry burns calories so it can’t be all bad! 
Usually alnone at my desk. I like to surf the net while I eat. And sometimes people return my calls then ( i usually take a late lunch).