A few years into practice, a man in his mid-fifties came to see me. He was successful, family-oriented, and active: biking, hiking, camping, always traveling.
He was not sold on functional medicine. He wanted an opinion from outside standard care, someone who would read his labs differently and tell him what she saw.
What I saw concerned me. His lab work was deeply unhealthy, and it carried major risk factors for heart disease. Certain markers in his results told me to dig deeper, so I ordered further testing his primary doctors had never run.
That testing sent him to a cardiologist, who found blockages serious enough to place five stents in his heart on an emergency basis. He could have died of a heart attack or a stroke at any point.
He came in curious about a second opinion. What was on the line, it turned out, were the decades he had planned to spend biking and camping with his family. There is a name for those decades, and most people have never heard it.
What health span means
Health span is how long you live well, strong and clear and able to do the things that make your life yours, while lifespan only counts the years.
When I explain health span to a new patient, I picture a long trek. You have this journey, and at the end of it, unfortunately, is the end of your life. How well you prepare for the journey, and how well you maintain yourself through it, is your health span.
Think of trekking across the Alps, or walking the Pacific Northwest Trail. How well have you prepared? How do you pace yourself? What do you do along the way to make sure you can complete the journey?
Lifespan only counts the miles. Health span asks how you traveled them.
Some of my patients tell me they have no wish to live to a hundred if the last stretch is spent managing decline. They want to live well with the years they have. Health span is the name for that, and I build my whole practice around it.
The gap most people never hear about
Living longer and living well have quietly drifted apart.
Around the world, people now live several years longer than a generation ago, and the years spent in good health have not kept pace. In the United States the average person now spends more than a decade near the end of life in poor health, the widest gap of any country studied.
That decade does not spread evenly across a life. Poor health piles up at the end with pain, lost mobility, a lengthening list of medications, and the slow loss of independence.
Medicine has become good at postponing death, and far less practiced at protecting the years before it. So the years get added, and too many of them land at the wrong end.
Everything I do aims at closing that gap, adding life to your years rather than only years to your life.
The three markers that tell me the most
Fasting insulin, fasting blood sugar, and HbA1c: Those three tell me more about your health span than anything else we measure at your first appointment.
Together they show me your metabolic health: how your body responds to the food you eat, what it is doing underneath, and your long-term risk for inflammation and disease. Metabolic trouble arrives years before a diagnosis does, and these three markers are where it shows first.
Fitness and muscle matter just as much
Your metabolism is the fuel system. Your fitness is the engine.
In a study of more than 120,000 adults, the fittest lived the longest, and the benefit kept climbing with no ceiling in sight. The survival difference between the least fit and the most fit was larger than the difference tied to smoking or diabetes.
So your first appointment includes a breath analysis that measures how well your body turns oxygen into energy. It reads your engine, and your engine predicts a great deal about the decades ahead.
Muscle is the next piece. Strength and lean mass protect your metabolism, your bones, and your balance, and they carry you through the years when a single fall can end independence.
Peter Attia, whose work I follow closely, calls this shift Medicine 3.0: care that aims to prevent the diseases that shorten health span, long before they arrive.
What changed for the man with the stents
His course changed with ordinary tools. He was not ready for peptides, so we started with supplements and the changes underneath. Out went processed foods, alcohol, and desserts. In came a clean diet, strength training, and steady low-intensity endurance work.
It took about a year of blood work, appointments, and deeper testing for him to understand what his habits had done to his body. That is the pattern I see again and again: The habits run quietly for decades, and then one day you are fifty and wondering how you got here.
The stents saved his life, and the year that followed gave him back his health span.
When protecting your health span means doing less
For a handful of my patients, the biggest threat to their health span is too much training and too little food. The trek cuts the other way for them: They are pushing for a result while their body sits in a high-stress state.
The scene is usually the same: The patient sits down frustrated. They are training constantly and barely eating, so they are hungry, tired, and aching. They are chasing a result without seeing that they have become their own block.
What I tell them is this: Food is your body's safety signal. Exercise is good for you, but too much of it puts heavy stress on the body, and long-term stress causes damage and inflammation. You keep pushing, so your body never gets the time it needs to heal and repair.
For someone in that training mindset, resting and being still is as hard as starting a training program is for anyone else. Pacing is part of preparing, because a trek you sprint is a trek you may not finish.
How I work toward your health span
Protecting your health span starts with seeing clearly. Remember the man with the stents? His course changed the day we saw what was happening, and yours starts in the same place.
Your first appointment reads more than forty markers across metabolic, cardiovascular, inflammatory, and hormonal health, alongside a body composition scan and the breath analysis. Together they show how your body is performing, not only whether disease is present.
From there we build a plan around where you are. It protects the systems health span rests on: your hormones, your muscle, your metabolism, and your recovery.
Sometimes the plan includes peptides, which are signaling molecules your body already uses. Where they are medically appropriate, and sourced from pharmacies the FDA watches, they can support repair, recovery, and tissue health.
The last ingredient is time, and time is the heart of longevity medicine as I practice it. I keep my practice small on purpose, so I can know each patient over years, recheck the labs, and adjust the plan as the body changes. Health span is not a result you buy once, it is a capability you protect, season after season.
A better question than "how long"
The question I would like you to carry is not how long you will live. It is how well, and for how long.
Confirming you are free of disease answers a smaller question, and it answers it at the floor. Whether your body will still do what you ask of it in twenty years is the larger question, and it is the one worth building around now, while the answer is still yours to shape.
That is what health span means — not the length of your life, but the length of your good life.
You are on the trek already. Your role is to make sure you complete it well.