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On this week’s BeingBrigid Show, Brigid welcomes Dr. Will Bulsiewicz, a board-certified gastroenterologist, New York Times bestselling author, and one of the leading voices on the gut microbiome and digestive health. Together, they explore the powerful connection between nutrition, the gut, chronic inflammation, and overall health—covering everything from elimination diets and autoimmune disease to blood sugar balance and the future of gut-focused medicine.

What You’ll Learn In This Episode:

  • What the gut microbiome is and why it’s central to human health
  • How nutrition is the most powerful driver of gut health and inflammation
  • The role of chronic inflammation in fatigue, brain fog, and disease
  • Why elimination diets must be temporary—not forever
  • How the gut microbiome impacts blood sugar and metabolic health

Timestamps:

00:00 – Intro + background on Dr. B

00:40 – What the gut microbiome really is

04:02 – Nutrition and digestive health in IBD, Crohn’s & colitis

18:34 – The role of chronic inflammation in fatigue, brain fog & disease

06:01 – Why doctors often dismiss nutrition (and what needs to change)

49:48 – Elimination diets: when they help and when they harm

56:11 – Gut microbiome + blood sugar research from Zoe

1:03:56 – Plant Powered Plus & practical takeaways

The Gut Microbiome: Epicenter of Human Health

Dr. B explains why the gut is home to over 38 trillion microorganisms and how these microbes influence not just digestion, but also metabolism, hormone balance, mood, immune health, and even genetic expression. With more microbial cells than human cells, supporting the microbiome is central to longevity and resilience.

Nutrition as the #1 Determinant of Gut Health

Despite outdated medical training, the science is clear: nutrition is the most important factor in shaping the microbiome. Dr. B shares his frustration with gastroenterology’s resistance to nutrition while pointing to powerful patient outcomes—where dietary changes reversed symptoms of Crohn’s, colitis, anxiety, and more.

Chronic Inflammation, Fatigue & Brain Fog

From autoimmune disease to hormone imbalances, chronic low-grade inflammation is at the root of most modern illnesses. Dr. B highlights how breakdown of the gut barrier (“leaky gut”) activates the immune system, often leading to systemic inflammation that manifests as fatigue, poor sleep, joint pain, migraines, or brain fog.

Elimination Diets: Helpful or Harmful?

Elimination diets can be a temporary tool to reduce symptoms—but Dr. B emphasizes they must not become lifelong restrictions. Without reintroducing foods and rebuilding gut fitness, restrictive diets harm the microbiome and lead to worse long-term health outcomes.

The Gut Microbiome and Blood Sugar

Drawing from his work with Zoe, Dr. B explains the gut’s role in blood sugar regulation and metabolic health. A diverse, fiber-rich diet produces short-chain fatty acids that improve insulin sensitivity and reduce inflammation—key to preventing type 2 diabetes and chronic disease.

Final Thoughts

From fatigue to fertility, digestive health to chronic disease prevention, healing the gut is the foundation of thriving at every age. Nutrition, not prescriptions, is the most powerful tool for reducing inflammation, balancing blood sugar, and reclaiming your energy.

Resources & Links:

Gut Health

Brain Fog, Bloating, & Microbiome Health: Evidence-Based Fixes with Dr. Will Bulsiewicz

Brigid Titgemeier
September 23, 2025
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