Hot takes: Dr. Sarah Rahal on ‘fibermaxxing’

Everyone’s ‘fibermaxxing’. Let’s talk about it.

Fiber is suddenly everywhere. More grams. Powders stirred into everything. “Gut health” bars promising better digestion, better metabolism, better everything.

But biology rarely works in blanket advice.

Fiber has become one of the most repeated prescriptions in modern wellness. If digestion feels off, the answer is usually simple: eat more fiber. Yet for a surprising number of people, increasing fiber is exactly when their symptoms start.

We asked ARMRA® Founder & CEO Dr. Sarah Rahal for her unfiltered take on what fiber actually does in the body, and why context matters more than the number printed on the nutrition label.

Why is fiber suddenly everywhere?

“Because it’s easy advice.

Fiber has been turned into a blanket rule: eat more of it and your gut will thank you. The reality is more nuanced.

Fiber is a category of carbohydrates that the human body cannot digest. Our enzymes do not break it down, and we do not absorb it for energy. Instead, fiber becomes fuel for the microbes living in the digestive tract.

So the real question isn’t simply how much fiber someone eats. The real question is what happens to that fiber once it enters the gut, and whether the system receiving it is functioning the way it should.”

What is fiber actually supposed to do?

“In a well-functioning digestive system, fiber follows a very specific path.

It passes through the stomach and small intestine largely unchanged, because human digestive enzymes cannot break the chemical bonds that hold fiber together. Eventually it reaches the colon, where the largest populations of gut microbes live.

There, microbes ferment the fiber. Through that fermentation process they produce compounds called short-chain fatty acids, including butyrate.

Those compounds matter. They nourish the cells that line the gut barrier, reinforce the tight junctions between those cells, and send beneficial signals through the immune, metabolic, and nervous systems.

That is the version of fiber most people hear about: fermentation in the colon producing metabolites that support gut health and broader physiology.”

So what’s the catch?

“Location.

Fermentation only works when it happens in the colon, which is built to handle microbial fermentation, acids, and gas.

If fermentation starts earlier in the digestive tract, particularly in the small intestine, the outcome flips.

Same fiber. Completely different result.

Instead of producing beneficial metabolites in a large fermentation chamber, microbes begin breaking it down in a narrow section of intestine that is not designed to host fermentation.

The byproducts of fermentation include gas, hydrogen, methane, and other compounds. In the small intestine, that gas has nowhere to go.

This is when people experience the symptoms most often associated with digestive distress: bloating, abdominal discomfort, visible distension, constipation, or diarrhea.”

Why does that happen more today?

“Because several biological systems normally prevent early fermentation, and modern life disrupts many of them.

Stomach acid is one of the first defenses. It helps sterilize incoming food and limits how many microbes survive into the small intestine.

Digestive enzymes and bile salts are another layer. They break down food efficiently so bacteria are not left with excess fuel sitting in the wrong place.

Then there is the migrating motor complex, the gut’s housekeeping system. Between meals, waves of muscular activity sweep through the digestive tract, clearing leftover debris and microbes so nothing stagnates long enough to ferment.

Today many of these mechanisms are weakened.

Stress. Poor sleep. Constant grazing. Processed foods. Medications that alter stomach acid or slow motility. Circadian disruption from artificial light. All of these factors influence how the digestive tract functions.

When those systems are compromised, microbes can begin fermenting material higher up in the digestive tract. Add large amounts of fermentable fiber into that environment and the result can amplify the problem.”

Is that why fiber can make some people feel worse?

“Exactly.

The blanket advice to 'just eat more fiber' ignores biological context.

When digestion is functioning well, fiber can absolutely support a healthy microbiome and contribute to beneficial metabolite production.

But if someone has bacterial overgrowth in the small intestine, impaired motility, or a compromised gut barrier, adding more fermentable material can simply feed more fermentation in the wrong place.

That is why many people who increase fiber suddenly experience more bloating, gas, or discomfort rather than relief.”

Where does ARMRA® fit into this conversation?

“ARMRA approaches gut health from the foundation up.

Colostrum evolved to build the gut itself.

At birth, the digestive tract is immature and vulnerable. Colostrum contains a complex network of bioactive compounds designed to strengthen the gut barrier, support mucosal integrity, and help establish a balanced microbial ecosystem from the very beginning.

That architecture still matters later in life.

ARMRA Colostrum delivers bioactive compounds that support the gut lining, reinforce the mucosal barrier, and help restore the biological terrain that determines whether digestion functions well in the first place.

It also naturally contains milk oligosaccharides, specialized prebiotic compounds found in mammalian milk. Unlike most plant fibers, which feed a wide range of microbes, milk oligosaccharides preferentially nourish beneficial bacterial species.

Fiber can absolutely play a role when the system is functioning well.

ARMRA focuses on something even more foundational: strengthening the terrain that determines how the entire system operates.”*

ARMRA Colostrum supplement container on a black background

ARMRA Colostrum Unflavored Jar - XL - ARMRA Colostrum

4.7/5

Rated 4.7 out of 5

Based on 15706 reviews

$119.99

[ $0.94/per serving ]

Disclaimers
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.