For fifteen years, I read the labs and called it medicine. The numbers came back normal. I told patients they were fine. Most of them did not feel fine. I had learned to trust the panel more than the person in front of me. That was the mistake. Normal labs are a floor, not a verdict.
Functional medicine gets mocked, and often for good reason. Some of it is supplements sold on fear. Some of it is a forty-marker panel with no plan attached. I understand the eye-roll. I trained in internal medicine. I spent a decade as a hospitalist across San Antonio. I know what evidence looks like. I also know what selling looks like.
But the mockery misses something true. Millions of people are told their labs are normal while their lives quietly come apart. Good labs. Bad life. There’s a reason. That gap is real. Wellness culture found it first, and then sold into it.
So here is the honest map of the field. Mainstream medicine is very good at catching disease once it arrives. It is less interested in the long slope before the diagnosis. Wellness culture rushed into that empty space. It offered attention, language, and a story. Then it charged for powders and fear. Both sides are half right. The patient is left holding the other half.
I want to be fair to the medicine I was trained in. In the hospital, I watched it save lives that nothing else could save. A heart attack needs a catheter lab, not a breathing exercise. Acute medicine is a genuine miracle, and I will defend it. But the catheter does not answer why the artery closed. The system that rescues you rarely asks what wrote the disease into your years. That unanswered question is the whole territory of this work.
Functional medicine, done seriously, is not a rebellion against science. It is a discipline about the slope. It asks what is actually happening in this specific body, over time, before the trouble has a name. Here are the principles I actually practice.
Normal is a population. You are a person.
A reference range is built from a crowd. It tells you where most people land. It does not tell you where you function best. A testosterone at the bottom of normal is still a number on a lab. It is not a life you can live well inside. A fasting glucose of 99 is called normal. It is also years of quiet drift you were never warned about. The range is a starting question, not the answer.
Symptoms are information, not noise.
Fatigue, brain fog, weight that will not move, sleep that no longer restores. Medicine often files these under stress and sends the patient home. But the body does not invent complaints for sport. The body doesn’t malfunction. It escalates. A symptom is usually the loud end of something quiet that began years earlier. My job is to trace it back, not to silence it faster.
Work upstream, not just downstream.
Most of what we treat is a downstream effect. High blood pressure, high glucose, high hsCRP, rising ApoB. These are outputs. Upstream sit the real inputs: sleep, visceral fat, chronic stress, a gut that stopped working, an inflammation that never resolved. You can medicate the output for decades. Or you can ask what keeps producing it. Functional medicine is the habit of asking the second question first.
The timeline is the diagnosis.
When did this start. What changed that year. What came before the symptom by six months. A lab is a photograph. A life is a film. Your cortisol at 8 in the morning tells a different story than your cortisol at 8 at night. Your inflammatory markers in a hard winter read differently than in an easy summer. I want the sequence, not just the snapshot. The sequence is where the cause hides.
Test, then decide. Do not sell first.
This is where the field earns its bad name. A peptide, a hormone, a stack of supplements handed out before anyone has understood the person. I use those tools. I use them last, not first. A treatment is the final step in a longer practice, not the opening move. If a clinic reaches for the prescription pad before it reaches for your history, that is not functional medicine. That is a store.
The person is the unit of care.
Two patients can share one diagnosis and need opposite things. One is inflamed from a grief he never named. One is inflamed from a schedule she cannot survive. The label matches. The cause does not. Your symptoms are not random. They are your biography, written in your biology. Real medicine reads that sentence in each separate person. It refuses the shortcut of treating the average.
None of this is anti-science. hsCRP is science. ApoB is science. The HPA axis and circadian biology and psychoneuroimmunology are science. Functional medicine, at its best, simply turns that science on the person instead of the population chart. It listens long enough to find the input. Then it acts. That is the whole difference, and it is not small.
This takes time, and time is the one thing modern medicine has priced out. A seven-minute visit cannot find a ten-year cause. That is not the moral failure of any single doctor. It is the design of the system they work inside. Functional medicine buys back the minutes. Most of the answer lives in those minutes.
I think often about the patient who sits down and says no one has ever explained this to me. She is not describing a supplement. She is describing being seen as a whole story instead of a row of values. That is the work. Not powders. Not hype. Attention, applied with rigor, to the specific human in the room.
Her labs were fine. Her life was disappearing. There was a reason. Finding it is the entire job.
Dr. Shiv Kumar Goel, MD is an internal medicine and functional medicine physician in San Antonio, and the author of Healing the Split: When Your Biology Is Fighting Your Biography. He writes on medicine and the body at Medium.