are grains complex carbs
Like grains, nuts, seeds and legumes are very high in complex carbohydrates. These foods also contain protein, healthy fats like omega-3 fatty acids, and a range of vitamins and minerals.Theyâre high in fiber to aid digestion and help maintain a healthy weight.hole grains are an excellent source of complex carbohydrates and dietary fiber. While all grains contain high levels of complex carbs, whole grains also provide large amounts of fiber. Some grains that contain high levels of complex carbohydrates include: 1  Rice. 2  Corn. 3  Wheat. 4  Barley. 5  Spelt. 6  Oats.