If you think fiber is boring, think again. In this episode of The AGEIST Podcast, Dr. Will Bulsiewicz, best-selling author and gut health expert, explains how gut health shapes everything from your mood and immune system to how you age. He shares why plant diversity, not calorie counting, is the key to better health, and how personalized nutrition is replacing outdated one-size-fits-all advice. Tune in to walk away with real, actionable ideas for feeling better—and it all starts with your next meal.
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Key Moments
“Stop counting grams of fiber and start counting plants.”
“Ninety-five percent of people are fiber deficient in the United States.”
“The measure of health within an ecosystem is biological diversity.”
Connect With Dr. Bulsiewicz
Book: Fibre Fuelled
Connect With AGEIST
Dr. Bulsiewicz on Plant Power
Dr. Will Bulsiewicz isn’t your typical gastroenterologist. A practicing MD and the author of Fibre Fuelled, Dr. Bulsiewicz—“Dr. B” to his followers—has emerged as a leading voice on the science of gut health and how it connects to every aspect of wellness. In a recent episode of The AGEIST Podcast, he breaks down why traditional medical education fails patients, and how eating a variety of plants can dramatically improve long-term health.
A New Framework for Health
For decades, medicine has focused on symptom management, not prevention. Dr. Bulsiewicz shares how his own health crisis led him to overhaul his diet and investigate the microbiome—an ecosystem of 38 trillion microbes living in our gut. The key takeaway? Health doesn’t start in the gym or the doctor’s office. It starts in your kitchen.
Why Fiber Isn’t What You Think
Dr. Bulsiewicz explains that fiber isn’t just about digestion. It’s the raw material that your gut microbes transform into short-chain fatty acids: compounds that impact your brain, blood pressure, metabolism, and more. Most Americans are fiber-deficient, and even fewer eat enough plant diversity to support a thriving microbiome.
What You Can Do Today
The most actionable advice from Dr. B is refreshingly simple: eat more types of plants. Instead of counting macros or obsessing over calories, aim for 30 different plant foods each week. This variety fuels microbial diversity, which is one of the strongest predictors of a resilient, disease-resistant body.
Dr. Bulsiewicz also introduces personalized nutrition as the next step in this journey, through his work with the health tech company ZOE. By understanding how your individual biology interacts with food, you can make smarter choices—and see better results.
For anyone interested in longevity, weight management, or simply feeling better, Dr. B’s insights are more than timely; they’re essential.
Tune in to hear more from Dr. Bulsiewicz this episode of The AGEIST Podcast or check out the full interview transcript.
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The ideas expressed here are solely the opinions of the author and are not researched or verified by AGEIST LLC, or anyone associated with AGEIST LLC. This material should not be construed as medical advice or recommendation, it is for informational use only. We encourage all readers to discuss with your qualified practitioners the relevance of the application of any of these ideas to your life. The recommendations contained herein are not intended to diagnose, treat, cure or prevent any disease. You should always consult your physician or other qualified health provider before starting any new treatment or stopping any treatment that has been prescribed for you by your physician or other qualified health provider. Please call your doctor or 911 immediately if you think you may have a medical or psychiatric emergency.
AUTHOR
This is not about gluten at all, it was a waste of time. The title should be changed.
I agree that the title is misleading,. But if you read the whole trasncript of the interview, they do talk about gluten and the issue with a gluten free diet for people that aren’t celiac. It’s interesting info, but definitley the title feels a little like click-bait. The bottom line is that if you aren’t celiac and you eat gluten-free, you might not be getting enough whole grains which provide fiber and the whole message is to eat more fiber in the form of differnt types of plants. including whole grains.