As much as I can, I try not to eat at my desk.

The main problem is that people see you online and don't kow you are working... or even the ones in the same office don't respect that it's your lunch hour.

So I long ago decided to avoid eating at my desk, unless I'm actually working (sadly, it happens quite often)

I think I have a healthy mix of eating with coworkers, so I can forge alliances. Eating with ex-coworkers, so I can keep up with what they are doing and see that the grass isn't always greener across the fence. And eating alone, either because I brought my lunch or because I just went to the sub shop.

When I eat alone I use it as a quiet time. Time to relax, clear my mind, read something relaxing...

On my old job I used to go for power walks when the weather wasn't so hot... it really helped with the relaxation.