Food is always less of a concern than alcohol, but still something important to consider. If you’re a big spiller – try to avoid dark-colored foods and red wine, and remember to wear something dark (black is always appropriate when done well).
Try to choose foods that you can eat while engaged in a conversation – nobody wants to look at you with nachos falling out of your mouth.
Remember what your mother taught you – chew with your mouth closed, swallow, then talk. There’s no other order when you’re around your colleagues.