If you're looking for lunch to take to work, let me give you a recommendation. Besides salads and sandwiches, soups are another excellent option. All you need to buy is a couple of thermoses and that's where you'll store your soup.
Lentils make a soup that is not only delicious, but will also leave you completely satisfied; it's so versatile that you can add practically anything. My Mexican family usually eats it with banana. If adding fruit isn't something you would like, try it with a bit of bacon.
Better yet, add some jalapeños like in this recipe. It only takes 20 minutes and you’ll have lunch for a couple of days!