Black beans are loaded with fiber--the soluble kind that helps to lower blood cholesterol. Start slowly so you have time to get used to more fiber.
Read labels to find low-fat tortillas. There are plenty of whole grain tortillas available, but not all of them are low in fat.
Feel free to take some liberties with this recipe. Use a grill pan to cook the chicken instead of a grill, and add other healthy toppings, such as lettuce and chopped tomatoes.