3. Beans. Beans are just about your best source of dietary fiber, which not only makes you feel full longer, it actually slows digestion and keeps blood sugar from spiking after a meal. This effect is so powerful that it can even lower your overall blood sugar levels.
Throw canned beans into every salad you make (rinse them first), and add them to pasta and chili. Black bean, split pea, or lentil soup is an excellent lunch, even if it comes from a can.