The humble lentil has long had a reputation as a healthy food. It contains 26% protein (higher than any other vegetable except for soybeans), and, when combined with rice, forms a complete protein, or one containing all essential amino acids. Lentils are also high in vitamin B1 (thiamine) and iron, which is particularly important for pregnant or menstruating woman and adolescents.
Lentils are available in cans, and - while not nutritionally deficient - err on the side of caution when it comes to ALL canned goods, owing to the controversial chemical BPA (Bisphenol A) used in the canning process. So, stick with the bulk bins at your local organic food store for all varieties of lentils.