I eat at my desk all the time, and I really need to stop. When I eat at my desk, I'm generally eating things that aren't that healthy to begin with, snacking unnecessarily, and/or eating too quickly, and doing it in some misguided notion that I'm able to work and eat at the same time. I'm not actually productive at times like that, it just lets me deal with some illogical guilt I feel when I get up to go eat at a table with other people, or out by myself in the park near the office.
When I get up and go to lunch instead of eating at my desk, I'm taking a real break, I'm socializing, or taking time to think.
I gotta stop eating at my desk.