My name is Brian Karaan.
Functional medicine physician. Denver, Colorado. Mayo Clinic alumni. Father. Husband. American son of immigrants who believed this country rewards those who do the work.
I did the work.
I grew up in a suburb of Minneapolis watching my father run a convenience store for 14 hours a day. He never complained. Never explained. He just worked. And I learned that the answer to any problem was the same — study harder, work harder, and trust the system this country offered to those willing to do their part.
I did my part.
I entered the University of Minnesota School of Medicine in 1992. Residency at the Mayo Clinic in Rochester in 1998. When I received my diploma, my father was in the front row. He didn't understand half the ceremony. But he understood everything that mattered.
I opened my practice in Denver in 2001. Married Sarah. We had Daniel. Life was exactly what I had imagined as a child watching my father work — organized, built brick by brick, exactly as planned.
I was a good doctor. Thorough. Meticulous. My patients trusted me. My colleagues respected me. I had arrived at the place my father imagined when he landed in this country with $400 and an English dictionary.
In 2004 I went hiking at the Grand Canyon with my son Daniel, who was 8 years old at the time.
A small cut on a rock. An infection. A helicopter. An amputation below the right knee.
I woke up in a hospital in Arizona without part of my leg — and with a clarity that no medical school class had prepared me for.
Not "how do I control this." But "why does this exist."
The difference between those two questions is the difference between the medicine I learned and the medicine I spent the next 22 years practicing.
I spent the following months reading outside conventional literature. Finding researchers who had reached conclusions the mainstream system ignored. Understanding that the human body has regulatory systems that modern medicine treats as secondary — and that are actually primary. That most chronic conditions we treat as inevitable have specific, documented, treatable origins — as long as you ask the right question.
In that process I found Dr. Eva. A European microbiologist who had spent decades studying mechanisms that conventional medicine systematically underestimated. Who had been professionally silenced for reaching conclusions that contradicted established interests. Who was working quietly in a garden in Boulder, Colorado while the academic world pretended she didn't exist.
What I learned that morning was not in any book I had read at the Mayo Clinic. But it was rigorous. Documented. And it worked in ways that my conventional practice had never worked for the most complex conditions I was treating.
I rebuilt my entire practice on that expanded vision.
I didn't abandon what I had learned. I learned to use it alongside what I hadn't known I was leaving out. I learned to look at systems that conventional medicine treats as isolated — and that actually communicate in ways that determine whether a patient recovers or simply survives alongside their disease.
I treated more than 4,000 patients over the following 22 years. Saw results that my colleagues asked me to explain. Received calls from doctors asking what I was doing differently.
The answer was always the same. I had stopped treating what showed up on the test. And started treating what caused what showed up on the test.
My son Daniel is 30 now. Every time we get together he still calls me dad with the tone of someone who grew up watching his father walk with a crutch and learned that it doesn't mean stopping.
My wife Sarah has been teaching second grade at a public school for 24 years. She knows every one of my patients by name without ever having met them. Because I come home and tell her. Because the stories matter. Because behind every lab number is a person who wants the same thing my father wanted when he landed in this country.
A life that is built. Not managed.
In 2026 much of what I learned that morning in Boulder began appearing in federal health guidelines. Policies that for decades had ignored mechanisms that independent researchers had documented for years were finally revised.
It wasn't a surprise to me.
It was confirmation.
Everything I share on this site comes from 22 years of rebuilding — my body, my practice, and my understanding of what the human body is actually capable of when you treat the cause instead of the symptom.
If you made it this far, you're probably looking for answers the system hasn't given you yet.
So was I.
I'm glad you're here.