March 25, 2026

Gut Health, Fiber, and the Microbiome, Explained

16 minutes

What does your gut really do—and how can you keep it healthy? In this episode of Health Matters, host Courtney Allison sits down with Dr. Haley Zylberberg, a gastroenterologist at NewYork‑Presbyterian and Weill Cornell Medicine, to find out the basics of gut health, from digestion and the microbiome to fiber, fermented foods, and the gut‑brain connection.

Dr. Zylberberg explains how fiber supports digestion, why everyone’s “normal” gut function looks different, and how stress and mental health can directly affect the digestive system. She also shares signs of a healthy gut, red flags that shouldn’t be ignored, and why colorectal cancer screening is so important—especially as younger adults are being diagnosed more often.

Whether you’re curious about probiotics, wondering how much fiber you really need, or looking to better understand your body, this episode offers practical, science‑backed guidance to help support lifelong gut health.

Chapters:

00:00 – The Basics of Gut Health and the Microbiome

What the gut is, how digestion works, and why the microbiome plays a critical role in overall health.

06:30 – Fiber, Food, and Supporting Your Gut

How fiber supports digestion, how much you need each day, common misconceptions, and tips for increasing fiber safely.

11:30 – The Gut‑Brain Connection

How stress affects digestion, why the gut and brain communicate so closely, and what that means for digestive symptoms.

15:10 – Red Flags and Colorectal Cancer Screening

Warning signs of an unhealthy gut, when to see a doctor, and why colorectal cancer screening is essential and preventive.

Key Topics Covered

· Gut anatomy and digestion

· The gut microbiome and “good” bacteria

· Fiber benefits and daily fiber intake

· Fermented foods and probiotics

· Gas, bloating, constipation, and diarrhea

· The gut‑brain connection and stress

· Red flag digestive symptoms

· Colorectal cancer prevention and screening guidelines

Takeaway Message

Your gut plays a central role in your overall health, and small, consistent habits—like eating enough fiber, managing stress, and knowing what’s normal for your body—can make a big difference. Paying attention to changes and staying up to date with recommended screenings can help catch problems early and even prevent serious disease.

Expert Guest

Dr. Haley Zylberberg’s clinical focus is general gastroenterology, with a specialization in celiac disease. She has a sustained interest in patient-outcomes research using large databases and has authored numerous peer-reviewed articles on celiac disease diagnosis and its clinical manifestations.

Dr. Zylberberg earned her B.A. in neuroscience and behavior from Columbia University and her medical degree at Hofstra-Northwell School of Medicine, where she graduated with a distinction in research. She completed internal medicine residency at The Mount Sinai Hospital, followed by a gastroenterology fellowship at NewYork-Presbyterian/Columbia University Irving Medical Center, where she served as chief fellow. During her fellowship, Dr. Zylberberg undertook advanced training in research methods, culminating in a master's degree in patient-oriented research from Columbia's Mailman School of Public Health.

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