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Oliver Buchannon
Dr. David Heitmann DC, MS

Doctor. Explorer. Builder of Humans. Frontier biology and the science of doing hard things. 🌍

"My stomach is eating itself."

Jul 8, 2026

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2 min read

"My stomach is eating itself."

The most measured man alive just found out his body doesn't care about his spreadsheet.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
GLP-1s, Retatrutide, and the Thing Nobody Warns You About

Jun 15, 2026

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4 min read

GLP-1s, Retatrutide, and the Thing Nobody Warns You About

Retatrutide will change everything about weight loss. The people who get that wrong will pay for it for decades.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Credit Cards Worth of Microplastics Debunked — Researchers Contaminated Samples With Gloves

Jun 8, 2026

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7 min read

Credit Cards Worth of Microplastics Debunked — Researchers Contaminated Samples With Gloves

The Microplastics Panic Is Built on Bad Science. That Doesn't Mean Plastic Is Fine. The influencers filling bags of plasma on camera, the credit card headlines, the brain tissue studies... here's what's actually happening and what I actually think you should do about it.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
You're Solving the Wrong Problem with weight-loss

May 26, 2026

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7 min read

You're Solving the Wrong Problem with weight-loss

Metabolic software, triple-receptor sledgehammers, flow states at COTA, and why Japan's wellness spend is flat

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Culture Is Metabolic Software

May 25, 2026

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11 min read

Culture Is Metabolic Software

Japan's ultra-low obesity flat line isn't about discipline or genetics. It's about what happens when a culture survives industrialization with its biological architecture intact.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Movement still cheats death.

May 18, 2026

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6 min read

Movement still cheats death.

Longevity drugs, wearable AI, a racing driver chasing Le Mans, and why movement still beats everything.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Longevity Drug Rapamycin Didn't Beat Exercise in First Human Trial

May 18, 2026

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3 min read

Longevity Drug Rapamycin Didn't Beat Exercise in First Human Trial

Rapamycin, mTOR, and human longevity: what the first crowdfunded clinical trial actually found, why the results surprised everyone, and what it means for the future of anti-aging science.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Healthcare's iPhone Moment...The System Just Broke Open

May 17, 2026

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7 min read

Healthcare's iPhone Moment...The System Just Broke Open

Google Fitbit Air, WHOOP telehealth, and why this changes everything. The gap between what the wealthy knew about their bodies and what everyone else had just closed.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Why NASA Can't Predict Who Survives the Mission... And What That Means for Every High Performer on Earth

May 11, 2026

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12 min read

Why NASA Can't Predict Who Survives the Mission... And What That Means for Every High Performer on Earth

A Guild of the Wild Field Intelligence Report. The research that will define the next decade of human performance isn't being talked about. This is the translation.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
What Happens to Astronauts Is Happening to You

May 6, 2026

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12 min read

What Happens to Astronauts Is Happening to You

A field report from inside NASA's human performance summit — the hidden risks, the countermeasures that don't exist yet, and the biology that will define the next decade of human performance.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
Why the FDA's Real-Time Clinical Trial Announcement Is Really About Your Bathroom

Apr 28, 2026

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4 min read

Why the FDA's Real-Time Clinical Trial Announcement Is Really About Your Bathroom

The snapshot model of medicine just got a formal challenge from inside the agency that built it. Here's what actually changed on April 28, 2026.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
You're Not as Resilient as You Think. Here's the Test.

Apr 28, 2026

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3 min read

You're Not as Resilient as You Think. Here's the Test.

Why most high performers have optimized themselves into a fragile corner and break down when something unexpected happens.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS
The desert broke me at mile 44. I took notes the whole way down.

Apr 21, 2026

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3 min read

The desert broke me at mile 44. I took notes the whole way down.

Why Guild of the Wild exists, what's coming, and what you just joined.

Dr. David Heitmann DC, MS
Dr. David Heitmann DC, MS

Guild of the Wild

The Frontier of Human Possibility

Field Notes from the Edge of Performance.

 Medical Disclaimer:
The information shared by Guild of the Wild is for educational and informational purposes only and is not medical advice, diagnosis, or treatment. Always consult your physician or qualified healthcare provider before making changes to your health, medications, training, nutrition, supplements, or recovery practices.

© 2026 Guild of the Wild is part of Dr. Dave Heitmann Productions LLC.
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