Flaxseeds

Flaxseed oil is one of the only plant sources of omega-3 fats, but the flaxseeds themselves provide the added benefit of fiber along with omega-3. Flaxseeds can be thrown on salads, tossed into smoothies, or sprinkled on vegetables. They also contain lignans, a group of plant nutrients that have been studied by the National Cancer Institute for their cancer preventive properties.