Longevity Optimization with Kayla Barnes-Lentz Dr. Will Bulsiewicz, MD - The #1 Nutrient for Longevity That Everybody Still Ignores
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Jan 1, 2026 
Dr. Will Bulsiewicz, MD, is a prominent gastroenterologist and bestselling author specializing in gut health. He discusses his inspiring journey from a struggling doctor to a gut health advocate, highlighting the critical role fiber plays in longevity. With 95% of Americans fiber deficient, he shares the shocking impacts of hyperpalatable foods on overeating. Will provides practical strategies for boosting fiber intake, the benefits of resistant starch, and how quickly dietary changes can improve gut microbiome health.
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Bake Seeds Carefully To Preserve Nutrients
- Baking seed crackers still provides fiber but watch omega‑3 oxidation from heat; chewing helps but fresh-ground is best.
- Use ground seeds in smoothies or meals when possible to protect fats and maximize fiber access.
Increase Fiber Low And Slow
- Increase fiber slowly to avoid bloating: start with what your gut tolerates and progress 'low and slow'.
- Consider adding ~3–5 g extra per week, and address constipation first with magnesium or other measures if needed.
Resolve Constipation Before Fiber Loading
- If you have chronic constipation, get stool moving before adding lots of fiber; magnesium citrate/oxide can help.
- Recognize pelvic-floor dysfunction as a common cause of straining even with soft stools and seek specialized care.