Give Your Oatmeal A Fiber Boost With One Simple Ingredient Fiber is one of the hottest food friends right now, and we love to see it. It's great for your gut, supports digestion, and is an all-around nutritional powerhouse. There are countless sources of dietary fiber, and oatmeal is already one of the best — a half cup of rolled oats has 4 grams. But if you really want to kick your gut into actio...