What food places are close to your work? I have learned how to eat moderately healthy at most fast food places since I'm in the same type of situation. I don't want to eat junk but I don't want to spend $15 on lunch or take too long. Sit down restaurants are much easier to find healthy options though.

You can get a good grilled chicken sandwich at almost all fast food places. The key is no cheese, of course, and hold the sauce. At Wendy's for example, the sauce is something like 4 times the fat of the rest of the sandwich. Skip the sauce. At McDonald's, no mayo. Learn to eat it with mustard or just veggies on top.

Chik-fil-a has fruit cups that are really tasty. McDonlads has the fruit and yogurt parfait.

The cafe in my building sells small bags of Baked Lays. You can always get a few of those bags and have them as a side with a reasonable sandwich from a fast food place. The grilled salad at Chik-Fil-A is really yummy but choose the dressing wisely. I get fat free honey mustard.