Beans of all varieties serve as a great source of fiber, low in fat, heart healthy, and make great additions to soups, salads, and dips. (3-chairs.com)
There won't be much liquid remaining when you drain the lentils, but you can reserve it and freeze it for later use — it's a great addition to a soup base. (pizzarossa.me)
Whole wheat orzo or spaghetti pieces would be a great addition to this soup. (aggieskitchen.com)