THE MOST ANTICIPATED HEALTH BOOK OF 2026

The Two Causes of All Disease

Preorder now to truly understand healing.

A proven framework for healing that
will change your life.

The Two Causes of All Disease reveals what thousands of patients have already discovered:
Your body is not broken.
You can heal.
And the path back to health is far simpler than you’ve been led to believe.

What You’ll Learn

(Four Core Insights From Chapter One)

A NOTE FROM

Dr. Guillory

For as long as I can remember, I have been trying to understand my own body.

I was that teenager sitting in exam rooms with symptoms no one could explain. Digestive issues, neurological symptoms, and the constant shame of being “broken”— year after year, the message was the same: “your labs look fine,” “we’re not sure,” “maybe this is just how you are.”

But something in me knew there had to be more.

Those years of confusion and fear pushed me to ask the right questions — questions that changed not only my health, but the entire direction of my life. I became a doctor because I wanted answers no one could give me. And the deeper I searched, the more clearly I saw a pattern: every chronic disease, no matter how complicated it looks, can be traced back to two causes.

Deficiency. And toxicity.

These two forces explained my own illness. They explained why I struggled for decades. And once I learned how to address them, my body did what it was designed to do — it healed. Twice.

Maybe your turning point came after that doctor left you feeling dismissed. Or the moment you realized you were managing symptoms instead of solving them. Or when your intuition finally got louder than your fear.

If you’re tired of being told your symptoms don’t make sense… if you’ve been trying to connect the dots and can’t find anyone willing to help you see the whole picture… you’re exactly who I wrote this book for.

This free first chapter will show you the foundation of everything I’ve learned: your body is not the problem — the lens we use to understand it is.

I hope you find clarity, relief, and the beginning of something new as you read.

— Derek

Discover how to take back your ealth health

With two simple truths.

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