My favorite healthy lunch is veggie stuffed pitas.
Pita bread from Baba's foods at the Farmer's Market (Wed & Sat) in my city (or online) and their spinach and feta hummus spread (get any pita bread or hummus though). I find the pita bread from this vendor lasts longer than what I've purchased at Henry's or Trader Joe's.
Grab some heirloom tomatoes, english cucumbers, red onion (or any kind of onion), fresh lemon juice from 1/2 of a lemon, some rosemary/thyme or your favorite fresh herbs, and feta cheese (I like feta!).
Cut up all veggies into small bite sized pieces. While prepping veggies, heat your oven or if you have a toaster oven to 350 degrees. Put some EVOO on the pitas and pop into oven for about 5 minutes. Spread the hummus over the pitas once slightly cooled then stuff the pitas with your veggie mix and top with additional feta (optional), fold and eat. Bon Appetito!
You can make the tomato mixture large enough to have this for lunch or a healthy snack 3 or 4 times. The pitas come in a 5 pack at Baba's and you can get any 1 item for $4 or any 3 items for $10. Their pitas and hummus spreads do not have any artificial colors, preservatives, etc.
Veggie Pita(In my pita, I also sliced seedless red grapes in with the veggies to give it a little sweetness.)
Hummus is also good (some brands are far better than others) when you serve it with fresh cut veggies. Try hummus with carrots. YUM!
Chipotle is good - I always get their veggie bowls. Always enough of a "serving" to eat for 2 meals.
I carry a BPA free water pitcher around to keep either fresh water in or fruit infused water. Drink at least half your weight in ounces daily. Best for hydration but also when you're not getting enough water, your body will seem hungry when it really is thirsty.