Common Fungus Beats the Flu at Its Own Game

By Dr. Scott Olson, ND Posted March 23, 2025

Big Pharma pushes annual flu shots like your life depends on it. What’s more, they insist expensive antivirals are your only defense against influenza.

But Mother Nature is hiding a more effective solution right under our noses—or rather, under forest floors and in grocery store produce sections.
There’s growing evidence that the humble mushroom is packed with flu-fighting potential.

These fantastic fungi are turning out to be medicinal superstars. Research shows they can reduce depression risk, improve brain cell growth, and guard against cancer.

Now, a new mouse study reveals they also provide powerful protection against influenza.

Published in Nature Immunology, the research found that beta-glucan—a soluble fiber found in mushrooms and other foods—acts as a flu barrier by limiting inflammation in lungs exposed to the infection.

The results were impressive: mice showed improved lung function and a lower risk of serious illness and death when infected with the flu.

While human trials are still needed, these findings offer real hope.

Beta-glucan is already known for boosting immunity, but the researchers wanted to test something different—it’s ability to minimize the harmful effects of influenza (called disease tolerance).

Unlike conventional treatments that try to kill the virus, beta glucan essentially reduces the impact of a viral attack on the body.

What makes beta-glucan truly unique is its ability to reprogram immune cells to better handle the flu. Treated mice had more neutrophils (immune cells), but these cells behaved in a more controlled manner than usual.

Instead of triggering the harmful inflammatory storm that typically causes severe flu symptoms, the body mounts a more measured, effective response—preventing the most serious complications.

The best part? You don’t need to wait for Big Pharma to turn this research into yet another overpriced pill. You can increase your beta-glucan intake today through common, affordable foods:

• Mushrooms: All varieties of mushrooms contain beta-glucans, with shiitake, maitake, and reishi being among the richest sources.
• Oats, barley, and rye: These whole grains are excellent sources.
• Seaweed: Brown algae like kelp, kombu, wakame contain significant amounts.
• Baker’s yeast: This single-celled fungus can be taken as a supplement.
• Wheat: The bran portion is particularly rich in beta-glucans.
• Algae: Species like Euglena gracilis, Chlorella, and Spirulina—offer these immune-supporting compounds.

We’re still waiting for human trials to confirm that beta-glucan has the same protective effects against flu in people as seen in mice.

But this soluble fiber has other health benefits, including reducing cholesterol and improving blood sugar control—so there’s every reason to add more of these safe, tasty, and affordable foods to your diet today.

P.S. Gut hack helps you avoid the flu.

Source:

Khan, N., Tran, K.A., Chevre, R. et al. β-Glucan reprograms neutrophils to promote disease tolerance against influenza A virus. Nat Immunol 26, 174–187 (2025).

Written By Dr. Scott Olson, ND

Nearly 25 years ago, failed mainstream medical treatments left Dr. Olson in constant pain – and his health in ruins. And that’s when he did something REVOLUTIONARY. He began his career in medicine – and dedicated his life to uncovering the true, underlying causes of disease.
Through his innovative medical practices in Tennessee and Colorado, Dr. Olson has helped cure countless seniors from across America of arthritis… heart disease… diabetes… and even cancer. All without risky prescription drugs or painful surgeries.

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