Gut Health Expert: Diet Is Only 20% Of The Puzzle

Gut health is about much more than what you eat. In this episode, Dr Karan Rajan speaks with Kaitlin Colucci about the gut-brain connection, IBS, bloating, stress, sleep, meal timing, yoga, and the nervous system.
They discuss why diet may only be one part of the gut health puzzle, how stress can affect digestion, why eating on the go may worsen symptoms, and how simple habits like breathwork, better sleep, mindful eating, fibre, and movement can support a healthier gut.
Kaitlin explains how the gut and brain communicate through the nervous system, why IBS is often misunderstood, and why gut symptoms are not always “just a food problem”.
This conversation also explores ultra-processed foods, caffeine, alcohol, artificial sweeteners, protein bars, fizzy drinks, meal timing, the migrating motor complex, yoga for IBS, and the role of social connection in digestion.
In this episode:
-Why gut health is not just about diet

- How stress affects digestion and gut motility

- What the gut-brain axis actually means

- Why IBS can involve nervous system sensitivity

- How sleep and circadian rhythm affect the gut

- Why grazing all day may worsen bloating

- How yoga, meditation, and breathwork may support IBS symptoms

- Practical ways to eat more mindfully

- The role of fibre, meal timing, and food diversity

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About Dr Karan:
Dr. Karan Rajan is a doctor, author, and educator dedicated to making health and medical science accessible to all. Through evidence-based analysis, he addresses topics such as gut health, brain health, and healthy lifestyle choices, while dispelling common medical myths with a touch of dark humor. His content provides reliable, research-driven insights designed to inform and empower viewers to better understand their health.
Connect with me:
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Website: www.drkaranrajan.com
00:00 Welcome Kaitlin Colucci
01:34 Gut Health Rapid-Fire
07:42 Why Eating on the Go Affects Digestion
08:23 What People Miss About Gut Health
09:04 The Gut-Brain Connection Explained
11:16 How Stress Impacts Digestion
12:21 IBS, Gut Sensitivity & Visceral Hypersensitivity
15:26 How to Regulate Your Nervous System
16:29 Mindful Eating, Food Diaries & Eating Without Distractions
19:04 Reconnecting With Food & Social Eating
22:13 Sleep, Circadian Rhythm & Gut Health
23:37 Meal Timing, Grazing & the Gut “Clean-Up Crew”
28:25 Yoga, IBS & Final Gut Health Advice
36:46 Modern Gut Health & Final Takeaways
#GutHealth #IBS #GutBrainAxis #DrKaranRajan #KaitlinColucci