Oatmeal is always a great way to fill you up so you won't be starving at lunch time. Cinnamon is a great zer0-calorie way to make it taste incredible.
I love fruit. Since I'm a salt girl anyway, fruit is my way to get the sweetness in for the day. Breakfast, lunch, snacks or whatever fruit is my friend.
Beef or chicken tacos/wraps are good for lunch too. They can be prepared ahead of time and don't taste awful after sitting like some foods. Just remember to get wheat tortillas. I'm not a big wheat fan, but I can't tell the difference with tortillas.
I'm still a Southern girl and love my fried chicken, but I'm also realistic and know that I can't have this all the time. However, oven-fried chicken comes pretty darn close to the real thing, and you don't feel so heavy when you get done eating it.