Ok, so sometimes it's easy to be so busy that you don't get one of those main meals in to your system. If you know you're going to have a busy day (or, if your world is pretty much made up of busy days!), consider setting yourself up for nutrition success.
If you're willing, invest in a dozen different "energy/nutrition" bars. Get 12 different ones and bring them home. While there, cut them in half, and put each half in a seal-able plastic bag. You might consider adding a *small* handful of nuts (I prefer almonds and cashews) and another handful of dried fruit. Bring them to work, and put them in a drawer.
Then, for the next three weeks, eat one of these "snacks" after about 2 hours of eating lunch. You may find that the balance of calories, fat and carbs is just what you need to make it through to the afternoon. (Oh, and in cutting that bar in half, you just cut another 100 calories out of your day!)