Show 1483: Plant Power: Feed Your Gut and Fight Inflammation

When you decide to grab a bite to eat, do you think about how to feed your gut microbes? Most of us don’t. Even if we did, their only means of stating their preferences is somewhat after the fact. Do you end up feeling less than well? Perhaps the denizens of your gut aren’t happy. In this episode, we consider how to support your microbiota and whether that can reduce the inflammation that seems to accompany modern life.

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Feed Your Gut Right to Fight Inflammation

Dr. Will Bulsiewicz is a gastroenterologist who urges all of us to focus on a healthful fiber-rich plant-strong diet to maintain our microbiome in good shape. He has described his own evolution from a busy medical student relying heavily on processed food products to a whole-food plant-based enthusiast. Eating a wide variety of plants is one of the easiest ways to make sure we are getting the nutrients our gut microbes need.

Why are the trillions of microbes in our large intestine so important? Dr. Bulsiewicz (aka Dr. B.) shares the story of a patient who was overwhelmed by a serious C. diff infection. A course of clindamycin for a skin infection had decimated her normal microbiome and left an open field for C. diff to flourish. Instead of treating her with surgery and even more potent antibiotics, Dr. B. and his colleagues utilized a fecal transplant. She got poop from a healthy person into her colon and left the hospital a few days later in good health herself.

What Is the Link Between the Microbiome and the Immune System?

Inflammation is one of the primary signs that the immune system has gone into action to fight off a perceived foe. There is a close relationship between the gut microbes, the gut barrier and the cells of the immune system. Between 70 and 80 percent of immune system cells are present in the gut (Nutrients, March 9, 2021).  There is just one layer of cells in the gut barrier, firmly attached to each other through tight junctions. If those tight junctions break down, pathogens and toxins can get from the gut into the bloodstream and activate the immune system into creating inflammation

Medicines That Harm the Intestinal Barrier

Diets that are high in salt have a negative impact on the integrity of the intestinal barrier (Nutrients, Nov. 25, 2025). In fact, a diet high in salt can reduce the number of Lactobacilli in the gut by 90%. This also affects the permeability of the gut barrier, which can contribute to auto-immune conditions.

When we asked about inflammatory bowel disorders such as Crohn disease or ulcerative colitis, Dr. B. told us he thinks it’s a mistake to classify them as auto-immune conditions. Instead, he suggests we should consider these conditions as due to the immune system rejecting the microbiome. Some of them might be initiated and perpetuated by failures in the gut barrier that allow certain organisms or their toxins into systemic circulation.

A number of medications can also harm it, most notably the nonsteroidal anti-inflammatory drugs (NSAIDs). Agents like ibuprofen, naproxen, celecoxib and meloxicam may disrupt the tight junctions that keep the intestinal barrier intact (Gastroenterology, Feb. 2018).  In some cases, they may also upset the balance of microbes.

Four Keys to an Anti-Inflammatory Diet

There are several different dietary patterns that allow you to feed your gut and fight inflammation. Good evidence supports a DASH diet, a Mediterranean diet, pescatarian, flexitarian, vegetarian and some vegan diets. We asked Dr. B. to summarize the four features healthful eating patterns share. They include adequate fiber, plenty of polyphenols, healthy fat and fermented foods (think of sauerkraut or kimchi).

Fiber and Flatulence

One drawback of a high-fiber diet is that when microbes in the colon ferment the fiber we can’t digest, they produce gases. It has to go somewhere, or it will cause sensations of cramping and bloating. Consequently, fiber is often associated with flatulence. Dr. B. suggests that there may be more gas, and it may be loud, but it shouldn’t be stinky. Smelly farts are born of sulfur, which is more common in a diet containing garlic, onions, crucifers like broccoli or cabbage, fish, eggs or meat.

Plant-Powered Plus

We wondered what might be included in the “plus” category when you feed your gut and fight inflammation. Dr. B. offers a few things that you might not expect in a book about diet, but they are related to reducing inflammation. One is to go outside early in the day, every day, to get your circadian rhythm in sync. Another is to maintain your emotional connections with family and friends. Still another, just as important, is to nurture your spiritual core.

This Week’s Guest

Dr. Will Bulsiewicz describes how a plant-powered diet can fight inflammation

Will Bulsiewicz, MD, is a New York Times bestselling author, award-winning gastroenterologist and internationally recognized health expert. Dr. Bulsiewicz directs the Gut & Microbiome Center for Excellence, a physician-led executive medicine and telemedicine practice based in Mount Pleasant, SC. Dr. Bulsiewicz is the author of several books, including his latest book, Plant Powered Plus: Activate the Power of Your Gut to Tame Inflammation and Reclaim Your Health. His website is https://theguthealthmd.com/books/

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In this week’s podcast, you get to peek into Dr. B’s shopping cart. Are you buying the same vegetables he does? We also get insights on his favorite recipes for grains like farro. And we discuss the effect of coffee on the gut microbes. If you want to feed your gut to encourage certain microbes, remember that consistency is crucial. You can’t eat a specific food once and expect it to make a difference. But consuming it several times a week will ultimately add up. We also discuss antidotes for flatulence, if you are interested in that.

Citations

• Wiertsema SP et al, "The interplay between the gut microbiome and the immune system in the context of infectious diseases throughout life and the role of nutrition in optimizing treatment strategies." Nutrients, March 9, 2021. DOI: 10.3390/nu13030886
• Si W et al, "High-salt diets, intestinal barrier, and hypertension: A mechanistic review and the promise of dietary therapy." Nutrients, Nov. 25, 2025. DOI: 10.3390/nu17233688
• Bjarnason I et al. "Mechanisms of damage to the gastrointestinal tract from nonsteroidal anti-inflammatory drugs." Gastroenterology, Feb. 2018. DOI: 10.1053/j.gastro.2017.10.049