Your gut microbiome controls your brain chemistry, your stress response, your sleep, your metabolism, and your ability to lose weight, and most people have no idea how broken theirs actually is. In this episode, Host Dave Asprey and microbiome expert Hannah Kleinfeld break down the hidden gut science behind GLP-1 drugs, ADHD, HRV, histamine intolerance, SIBO, and why most probiotics you’re taking are probably dead before they even reach your intestines.
– Get 20% off your next purchase of OMNi-BiOTiC with code ‘Dave20’ at: https://omnibioticlife.com/
Hannah Kleinfeld is the co-founder and COO of Omni-Biotic US, a Yale and Harvard graduate, and a certified health coach whose personal battle with Lyme disease drove her deep into functional medicine and microbiome science. Omni-Biotic is the number one probiotic brand in Europe, used in hospital systems alongside antibiotic treatment, and is now bringing that clinical-grade research to the US market.
Dave and Hannah go deep on the gut-brain axis, the vagus nerve, and how dysbiosis drives everything from brain fog and poor sleep optimization to inflammation, metabolic dysfunction, and compromised mitochondria. They cover how GLP-1 drugs slow gut transit time and trigger secondary dysbiosis, why most capsule probiotics rehydrate in stomach acid and fail, how short-chain fatty acids like butyrate cross the blood-brain barrier to regulate neuroinflammation, and how your gut bacteria directly control your heart rate variability, hormones, libido, and skin. This is biohacking your biology from the inside out, and it goes far deeper than supplements and fasting.
You’ll Learn:
-Why GLP-1 drugs like Ozempic create secondary dysbiosis and what to do about it
-How gut inflammation suppresses HRV, disrupts sleep, and accelerates aging
-Why most probiotics rehydrate in stomach acid and never make it to your intestines
-The gut-brain connection behind ADHD, brain fog, anxiety, and mood disorders
-How dysbiosis sabotages weight loss by skewing Firmicutes to Bacteroidetes ratios
-What the vagus nerve has to do with stress resilience and mitochondria health
-How to support your microbiome through antibiotics, travel, and SIBO recovery
-The histamine problem hiding inside popular probiotic strains
-Why the first 1,000 days of a baby’s life shape lifelong immunity and HPA axis function
-How targeted probiotic formulations are changing functional medicine
Resources:
• Get 20% off your next purchase of OMNi-BiOTiC with code ‘Dave20’ at: https://omnibioticlife.com/
• Get My 2026 Clean Nicotine Roadmap | Enroll for free at https://daveasprey.com/2026-clean-nicotine-roadmap/
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Thank you to our sponsors!
-Suppgrade Labs | Grab your DAKE and Minerals 101 duo at shopsuppgradelabs.com and use code DAVEPOD for 15% off today
-Pre-order Arthur Brook’s new book today at themeaningofyourlife.com. You can also see Arthur speak live at the 2026 Beyond Biohacking Conference
-Fatty15 | Go to https://fatty15.com/dave and save an extra $15 when you subscribe with code DAVE
-BrainTap | Go to http://braintap.com/dave to get $100 off the BrainTap Power Bundle
Timestamps:
00:00 – Trailer
01:10 – Intro & Guest Welcome
03:12 – Kids & Gas: Gut Imbalance in Children
06:42 – Pills vs. Powder Probiotics
07:28 – Omnibiotic Overview & Dave’s Story
10:44 – Probiotics & Heart Rate Variability
14:14 – GLP-1 Drugs & the Microbiome
17:24 – Gut & Sleep Quality
19:13 – Probiotics & SIBO
27:47 – Gut Bacteria & ADHD
29:55 – Gut, Libido & Fertility
36:04 – Gut & Unusual Microbiome Facts
43:22 – Histamine Intolerance & Probiotics
51:58 – Kids’ Microbiome vs. Adults’
56:10 – Outro Connect with Dave Asprey!
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