Dietary Fiber, Leaky Gut, and Autoimmune Disease: What You Need to Know


June 14, 2018 by Deborah Penner


If your gut health is struggling, everything else follows. From digestion to immune function and hormone balance, the health of your microbiome is the foundation of overall well-being. When the gut lining becomes compromised—a condition often referred to as leaky gut syndrome—it can trigger widespread inflammation and autoimmune responses, leading to issues like joint pain, skin conditions, thyroid disorders, and digestive distress.


A key factor in healing and maintaining gut integrity is ensuring you get the right dietary fiber and beneficial probiotics to support your microbiome.

The Gut-Brain Connection: Why It Matters

Your gut isn’t just a digestive system—it’s your “second brain.” With nearly as many neurons as your actual brain, the gut plays a significant role in neurotransmitter production, immune function, and hormone regulation (including the conversion of T4 to T3 for thyroid health). When gut health declines, it affects mood, energy levels, metabolism, and even cognitive function.



New research also highlights the importance of the oral microbiome in overall health, showing potential links between oral bacteria and cognitive decline. This further emphasizes how digestion, inflammation, and even brain health all trace back to what’s happening in the microbiome.


Gut Health, Soil, and Your Microbiome

The microbes in your gut are strikingly similar to those found in healthy, living soil. Eating organically grown produce from rich soil (and even leaving a little dirt on your veggies!) can help restore the balance of good bacteria in your gut.


Another way to boost microbial diversity is by incorporating lacto-fermented foods like sauerkraut, kimchi, and fermented vegetables into your diet. Just be sure to buy them raw and refrigerated—canned, shelf-stable options lack live probiotic cultures.

The Fiber-Microbiome

Connection: Why It’s Essential

Without enough dietary fiber, your beneficial gut bacteria starve, making your microbiome vulnerable to imbalance. Researcher Kerry Bone even suggests that maintaining adequate prebiotics (fiber) is more important than taking probiotics alone.

Soluble vs. Insoluble Fiber: The Key Players in Gut Health

There are two main types of dietary fiber:

  • Soluble Fiber: Found in foods like chia seeds, cucumbers, okra, berries, and nuts, this gel-like fiber seals and repairs the gut lining, stabilizes blood sugar, and feeds beneficial gut bacteria by fermenting into short-chain fatty acids. This makes it a powerful tool for managing leaky gut and inflammation.
  • Insoluble Fiber: Think of this as the “scrub brush” of your intestines. Found in leafy greens like kale, spinach, and arugula, as well as celery, insoluble fiber helps move waste through the gut, supporting regular bowel movements and detoxification.

Both soluble and insoluble fiber work together to provide structure for the microbiome, nourish the gut lining, and regulate immune function—all of which are essential in preventing and managing autoimmune disease.

How Much Fiber Do You Need?

If you’re eating a variety of berries, leafy greens, nuts, seeds, and fresh vegetables at least twice a day, you’re likely getting a good mix of soluble and insoluble fiber. However, you can always fine-tune based on your body’s signals:


  • For loose stool: Increase soluble fiber (chia seeds, flaxseeds, psyllium).
  • For constipation: Add more insoluble fiber (leafy greens, cruciferous veggies).
  • For blood sugar balance: Extra soluble fiber helps slow glucose absorption and stabilize insulin levels.

A simple way to boost fiber intake is by soaking 1-6 tablespoons of chia, flax, or psyllium seeds in water overnight and drinking them throughout the next day.

A Word of Caution: Go Slow!

Some high-fiber foods can cause bloating and gas, especially when first introduced. Jerusalem artichokes, for example, are notorious for this! (Even Lewis and Clark’s expedition journals mention their team experiencing digestive distress after eating them.) To avoid discomfort, start small and increase fiber intake gradually.

The Microbiome, Nutritional Ketosis & Brain Health

The Bottom Line

Your microbiome is the foundation of your health. By fueling it with fiber, probiotics, and nutrient-dense whole foods, you support immune balance, digestion, and hormone function—and help prevent or heal leaky gut and autoimmune disease.


Looking for practical ways to support gut health? Reach out today to learn more about how Metabolic Rescue can help optimize your digestion, energy, and well-being!

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Key Takeaways from the Interview