I take my lunch to work everyday and have lost 51 lbs since August! Since I work in a preschool classroom, I usually end up eating my lunch standing up. I need to take things that are portable and easy to eat.
I buy either sandwich thins or 80-calorie wheat buns. Each day, I make a sandwich with turkey or ham and low-fat cheese, or a Boca burger with low-fat cheese. I usually have a bag of pretzels or baked potato chips. It's cheaper to buy the large bags and portion them out into baggies. I buy the single-serve bags if I find a good deal. Later in the afternoon, I have a low-fat granola bar. Lately, I've been taking 90-calorie Fiber One bars. I save my fruit and veggie servings for when I get home since they're messy to eat and require a lot of chewing (except bananas - I sometimes take those). When our kids bring birthday or holiday treats, I stay away from them. A cupcake won't make me happier than seeing the number on the scale creep downward!