I usually bring my lunch and it's either a sandwich with a side of veggies and possibly some wheat thins, or some leftover dinner. I get wheat or whitewheat bread (whole grain white) and some lean deli meat like turkey or ham. I stay away from cheese at lunch time and only use a little bit of mayo. I was bringing baby carrots to munch on but I got sick of those so I now bring some leftover veggies.
I also have a stash of granola bars in my desk for an afternoon sweet attack!
When I don't bring my lunch, I eat at Jason's deli. If you have a Subway or Jason's near you they have a healthier selection than other fast food places. Also most places have salads with grilled chicken. Or grilled chicken sandwiches (the key is to leave off the mayo!!!)
I've been doing Weight Watchers since last February and I was able to lose 33 lbs in about 8 mos and then maintain that since. I'm now starting on my 2nd goal to lose another 25! So eating healthy is a must for me!
Sometimes it's a pain to make my lunch, but with a little advance planning I can put things together at the beginning of the week and then just grab and go!
I'm sure you will find what works for you!