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The research behind the latest fiber headlines is real. Applying it to an already-sensitized gut is where it goes sideways.
Gut Health & The Terrain Protocol
You’ve probably seen the headlines by now: a Mediterranean diet trial in psoriasis patients showed real improvement in skin severity scores over 16 weeks. Fiber tends to get singled out as the hero in the coverage that follows — but that trial tested a whole dietary pattern, not fiber on its own. It can’t actually tell us whether fiber was doing the work, or whether it was the removed processed food, the added omega-3s, the lower alcohol intake, or some combination of all of it. “Higher fiber helped” is a much bigger claim than the data supports.
Here’s why the mismatch happens. That kind of research is done on a general population — people with a range of gut health, not specifically women with an already-sensitized, already-irritated gut lining, which describes most women starting this work. Fiber recommendations that test well in a general population don’t automatically transfer to a gut that’s inflamed and struggling with permeability. In fact, for that gut, added fiber usually makes things worse, not better.
Fiber isn’t actually a required nutrient. There’s no deficiency disease from not eating it, no true RDA the way there is for protein or specific vitamins. What fiber does do, especially the fermentable kind, is give gut bacteria something to ferment. In a healthy, calm gut, that fermentation process is manageable. In a gut that’s already irritated — which is the starting point for almost every woman I work with — that same fermentation adds load on top of a system that’s already struggling to keep up. More gas, more bloating, more histamine symptoms, not less.
A 2012 gastroenterology study looking at reducing dietary fiber intake found real symptom improvement in patients with digestive complaints — supporting the idea that removing fermentable load, not adding more of it, is what calms an irritated gut. That’s the opposite direction of the “more fiber” headline, and it’s the framework this protocol is actually built on.
Gut healing here doesn’t come from stacking more inputs on top of an already-taxed system. It comes from taking the irritant load down first — pulling the Three Drivers (grains, sugar, and seed oils), letting the gut lining calm down and repair — before asking it to process more fermentable material. Fermented foods and fiber-forward eating aren’t off the table forever. They’re just not where you start.
This is one of those places where the mainstream advice and the right advice for your specific gut point in different directions. Both can be true at once. The trick is knowing which one applies to where your body actually is right now — not where a general population study says it should be.
Source: Pérez-Bootello J, et al. Mediterranean Diet and Patients With Psoriasis: The MEDIPSO Randomized Clinical Trial. JAMA Dermatol. 2025;161(12):1215–1223. PMID 40991259.
Source: Ho KS, Tan CY, Mohd Daud MA, Seow-Choen F. Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms. World J Gastroenterol. 2012;18(33):4593–4596. PMID 22969234.
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