Flax seeds are small, golden-brown or reddish-brown seeds that come from the flax plant. They are an excellent source of fiber and omega-3 fatty acids, and are also high in antioxidants. Flax seeds have a nutty, earthy flavor and a crunchy texture. They can be added to smoothies, yogurt, oatmeal, and baked goods or sprinkled on salads or other dishes. Flax seeds can also be ground and used as a flour or meal.