Let's talk about dietary fiber in plain terms: the difference between soluble (fermentable) and insoluble fibers, how soluble fiber feeds gut microbes to produce beneficial short-chain fatty acids, and why insoluble fiber adds bulk to ease transit. We'll also briefly discuss how FOS/GOS and inulin fit into the picture.  Practical takeaways include aiming for about 25–30+ g/day from whole plant foods, using psyllium as a balanced supplement option, increasing fiber slowly to avoid discomfort, and seeking specialized care for those with GI conditions, since more fiber isn't appropriate for everyone. Resources The Gut/Brain/Immune System and Non-Nutritive Sweeteners class mentioned in this episode The 2026 Supplement Deep Dive Wait List