Nutrition science argues about nearly everything. Fat, carbs, meal timing, coffee. Fiber is the exception: roughly 19 out of 20 Americans fall short of the daily target, and research keeps connecting that gap to digestion, blood sugar stability, cholesterol, and even mood. The part most people never hear is that fiber is not one thing. Soluble fiber slows you down, insoluble fiber keeps things moving, and fermentable fiber feeds the trillions of gut microbes that help run the rest of you. Part 9 of the Food Literacy Path is live today: The Fiber Gap. Start at dietdiscipline.com/start-here.