Sharon Palmer, RDN and author of Plant-Powered for Life, says steel-cut oats are the way to go. Even though you may think oats are totally boring (or meant for babies and old people), they're not. She notes that they're totally customizable -- think fruit, nuts, seeds, and spices -- and they're full of good stuff like a kick-ass type of fiber called beta-glucan, which has a nice cholesterol-lowering effect as a bonus.
Sure, they’re uber trendy, but according to Lara Felton, RDN and head of the dietary team at ShopWell, there's a good reason for that. She says, "Just two tablespoons of chia seeds are a great source of fiber, omega-3 fats (the heart-healthy fats), protein, and calcium." So dump some in your smoothie, on your cereal, or over a baked sweet potato and be the healthy hipster you know you are.