Blog Post

February 10, 2024

The Importance of Fiber for Gut Health: Feeding Your Microbes

In recent years, gut health has surged in popularity, and for good reason. The microorganisms that reside in your gastrointestinal tract are essential for preserving our general state of health and wellness. From training your immune system to keeping your gut in balance, gut bacteria impact a range of health outcomes. The maintenance of gut health depends not only on the microbes present in your gastrointestinal tract but also on the nutritional value of your diet.

Studies show that consuming diverse whole foods can promote a healthy gut, while a diet high in processed foods and sugar can lead to dysbiosis, an imbalance of gut bacteria. One of the keys to maintaining healthy gut microbes is fiber.

While probiotic foods can be helpful, the microbes in these foods don't take up permanent residence in your gut. Instead, native microbes need fiber to flourish. Fiber is difficult to digest, so it ends up in the lower intestine, where microbes can feast. Prebiotic compounds also encourage the growth and health of beneficial microbes. Metabolites, which are microbial byproducts, can help quell inflammation and defend against infections, including intestinal infections.

The Western Diet Is Low in Fiber

Did you know that most modern diets lack fiber? Studies show that the average American consumes only about 15 grams of fiber daily, only half of what the U.S. government recommends. This is a big problem because fiber is essential for maintaining a healthy digestive system and keeping gut microbes happy.

Your ancestors likely had much more fiber in their diets than you do today, which means your gut microbes may be feeling the deficiency. To make matters worse, many processed foods people eat today are low in fiber and high in sugar and other unhealthy ingredients.

Rest assured, numerous palatable and nourishing food options contain high amounts of fiber, such as fruits, vegetables, whole grains, and legumes. So, let's try to add more fiber to your diet and keep your gut microbes happy and healthy.

Studies suggest humans historically ate more fibrous meals, and archaeological evidence shows ancient desert dwellers ate 135 grams of a specific type of microbe-feeding fiber each day. Paleolithic diets were diverse and likely contained many forms of fiber.

Science Supports the Benefits of Fiber for Gut Health

A study in the journal Microbiome found that transitioning to a refined diet with soluble fiber is the primary driver of gut microbiota alterations. So, one smart thing you can do for your gut microbiome is feed it fiber.

Fiber is the best way to feed your microbes, and adding prebiotic food can also promote the growth of helpful microbes. Studies show that feeding microbes the foods they need can even protect against food allergies by preventing leaky gut.

Support Your Gut Microbiome with Fiber

If you want to boost your gut microbiota, try adding more fiber and prebiotic foods to your diet. For every 10 grams of prebiotic carbohydrates that reach the gut microbiota, about 3 grams of additional bacteria can grow. This can lead to the growth of 3 trillion new organisms by just adding those 10 grams of prebiotic food each day.

Fiber is beneficial for gut bacteria, as it passes through your digestive system mostly undigested, providing a food source for the bacteria to break down and thrive on. And don't worry; getting enough fiber doesn't have to mean eating a bland and boring diet.

There are plenty of delicious, fiber-rich foods to choose from, including whole grains, fruits, vegetables, nuts, and seeds. Plus, adding prebiotic foods like garlic, onions, and bananas can further support the growth of beneficial microbes. Next time you plan your meals, don't forget to include some tasty fiber and prebiotic-rich options for your gut microbes.


Taking care of our gut microbes should be a priority for maintaining overall health. Numerous health advantages have been associated with a balanced gut microbiome, such as enhanced immune function, better digestion, and improved mental well-being.

By including more fiber and prebiotic-rich foods in your diet, you can support the growth of beneficial gut bacteria and improve your overall well-being. Therefore, it is essential to consider your gut microbiota while designing your meals and incorporate minor adjustments in your diet to promote a robust gut microbiome.


Makki K, Deehan EC, Walter J, Bäckhed F. The Impact of Dietary Fiber on Gut Microbiota in Host Health and Disease. Cell Host Microbe. 2018 Jun 13;23(6):705-715. doi: 10.1016/j.chom.2018.05.012. PMID: 29902436.

"Building a Healthy Gut Microbiome | Mayo Clinic Connect." 01 Sept. 2021,

"Gut microbiota link dietary fiber intake and short-chain fatty acid ...." 01 Oct. 2021,

"It's the fiber, not the fat: significant effects of ... - Microbiome." 11 Feb. 2020,

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