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Dr. Berg’s Healthy Keto and Intermittent Fasting Podcast

The #1 Most Dangerous Fiber in the World

Dr. Berg’s Healthy Keto and Intermittent Fasting Podcast

Dr. Eric Berg

Health & Fitness

4.71.7K Ratings

🗓️ 8 April 2026

⏱️ 9 minutes

🧾️ Download transcript

Summary

The most dangerous fiber is often disguised as healthy, but could be silently damaging your health. In this video, we’ll cover the connection between fiber and gut health, the worst fiber foods to avoid, and the hidden problems with refined fiber they don’t want you to know about.



0:00 Introduction: What fiber is bad?

1:18 Fiber and gut health explained

4:24 Refined fiber is toxic fiber

6:06 The problem with processed fiber

6:42 SIBO and refined fiber

7:40 Processed fiber research

8:23 Supporting gut health and avoiding processed fiber


👉 Download Dr. Berg's Free Daily Health Routine: https://drbrg.co/45qtO07




The most dangerous fiber in the world is refined fiber. Certain fiber in its natural form feeds your microbes, helping them thrive. Refined fiber is junk food for your microbes. Fiber is often considered important, but it can cause problems for many people.


When you eat onions, berries, beans, and other natural sources of fiber, they provide the body with polyphenols. Polyphenols help determine which microbes are fed in the gut. This means polyphenols selectively support good bacteria while suppressing bad bacteria.


Refined fibers such as chicory root fiber, soluble corn fiber, and tapioca fiber are ultra-processed foods for your microbes. Similar to refined sugar and carbs, refined fiber is processed with chemicals, heat, and enzymes.


Huge amounts of processed fiber are being added to our food. This allows the wrong bacteria to take over the gut, contributing to conditions like small intestinal bacterial overgrowth (SIBO), leaky gut, inflammation, and autoimmune disease.


Dr. Eric Berg DC Bio:

Dr. Berg, age 60, is a chiropractor who specializes in Healthy Ketosis & Intermittent Fasting. He is the Director of Dr. Berg Nutritionals and author of the best-selling book The Healthy Keto Plan. He no longer practices, but focuses on health education through social media.


Disclaimer:

Dr. Eric Berg received his Doctor of Chiropractic degree from Palmer College of Chiropractic in 1988. His use of “doctor” or “Dr.” in relation to himself solely refers to that degree. Dr. Berg is a licensed chiropractor in Virginia, California, and Louisiana, but he no longer practices chiropractic in any state and does not see patients, so he can focus on educating people as a full-time activity, yet he maintains an active license. This video is for general informational purposes only. It should not be used to self-diagnose, and it is not a substitute for a medical exam, cure, treatment, diagnosis, prescription, or recommendation. It does not create a doctor-patient relationship between Dr. Berg and you. You should not make any change in your health regimen or diet before first consulting a physician and obtaining a medical exam, diagnosis, and recommendation. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition.

Transcript

Click on a timestamp to play from that location

0:00.0

The number one most dangerous fiber in the world is refined fiber. What the heck am I talking about refined fiber?

0:10.6

We spent many, many years studying refined sugars and refined carbohydrates, right? It starts off with sugar cane with all the different vitamins and minerals and then we strip it off and then we have this refined sugar and we find out it's bad for us. Well, when we talk about fiber, fiber is not for us as humans.

0:26.8

It's for our microbes. And we're doing the same exact thing we did to our bodies with refined

0:31.7

sugar as we're doing to our microbes with refined fiber. Certain fiber in its whole form can feed the microbes and make them

0:41.2

thrive. Other fiber that's refined is basically junk food for the microbes. The information I'm

0:48.0

to share with you, you probably've never heard. It's fascinating. You need to know about it. Because right now

0:52.8

there's such a fiber craze everyone's like

0:55.4

trying to get as much fiber as they can and for a lot of people it's creating a lot of problems

1:00.1

and there's some fascinating research on this topic too where they're feeding mice refined fiber

1:05.8

and some of them are developing liver cancer more on that in a little bit. But the study was published in Cell,

1:12.4

one of the most prestigious scientific journals in the world. And I'm going to walk you through

1:17.0

why that happens. When you eat a bean or an onion or a berry, you don't just have fiber sitting

1:25.4

in there. Okay. That fiber is physically bound to something called polyphenols.

1:32.6

So in other words, when you're eating plant fiber, it's not just coming as fiber.

1:36.1

It's bound to something else, very, very tightly.

1:39.8

Maybe you've heard about polyphenols.

1:41.5

They're in red wine, they're in berries, green tea, dark chocolate.

1:45.6

But that's the least interesting thing about them. Here's what you need to know. Every single

1:49.8

planet Earth has polyphenols. And they're literally woven together with fiber like this. Okay.

1:55.5

They're bonded in the cell wall. When you eat them, they're supposed to travel all the way through

2:00.1

your digestive system

2:01.2

down into your gut, where your body then breaks them apart. But they're meant to be consumed as one

...

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