People walk through our doors for many different reasons, but the underlying story is often the same.
Most of them consider themselves healthy; former athletes, high performers, and people who care. But over time, life takes priority. Careers, families, responsibilities. Health slowly moves to the background. That shift usually starts sometime in their forties.
At a certain point, something changes.
Energy isn’t what it used to be. Body composition starts to shift. Hormones begin to decline. There’s a growing awareness of time, and a realization that being present for the next phase of life actually matters. Not just being alive, but being fully functional.
Some people come in after a loss. A friend. A family member. And they realize they don’t actually understand their own risk.
Others are doing everything right on paper. They work out, eat right, but have hit a ceiling. They know there’s more going on beneath the surface, and they want clarity.
And then there are those who are simply frustrated. They know there’s more to know about their health, more that could be done, and they’re not getting those answers from the traditional system.
That’s when they come to us at Preamble.
One of the most common things I see in men is the belief they’re fine as long as they’re functioning.
And on the surface, they might be.
They’re strong, they exercise and they push themselves. But a lot of that mindset is rooted in a younger version of themselves, where performance meant intensity.
What they don’t always recognize is that performance and longevity are not the same thing.
I see men who are physically strong but have very low VO₂ max. Men who are training hard but carrying levels of body fat that quietly increase long-term risk. Men who are focused on building muscle but overlooking cardiovascular fitness and metabolic health.
VO₂ max is a good example.
It’s often viewed as something for athletes, and at the high end, it is. Those massive numbers you see from Olympians and elite endurance athletes carry the best bragging rights in the game. But there’s far more to it than that.
When your VO₂ max falls below 25, you're not going to have the cardiovascular capability to have normal sexual health. Some people find that important. Below 20, you’re not going to be able to go on a simple hike with your family without stopping, resting, and falling behind.
That’s not performance. That’s basic function. And most people have no idea where they fall.
The bigger issue is that a lot of what people are told about their health comes from a system that isn’t built to optimize it.
When you get standard blood work through a primary care setting, you’re getting what insurance allows. Those panels were designed to detect disease, not prevent it.
If you don’t meet a disease threshold, you’re told you’re fine. But “fine” is not the same as optimal.
Take something like hemoglobin A1C, the standard lab test for diabetes. If it’s above 5.7, you’re labeled prediabetic. Above 6.5, you’re diabetic.
What that misses entirely is the progression leading up to it.
A1C can be rising for years before it crosses that threshold. Insulin levels can be elevated long before A1C reflects it. That’s where the real story is. That’s where intervention actually matters.
For a lab test that costs a few dollars, we can look at fasting insulin and get a much more nuanced understanding of blood sugar control and insulin resistance. But it wasn’t included in the medical canon decades ago, and it’s incredibly difficult to change those standards now.
So people get told they’re healthy, while the early signals are already there.
That’s the gap, and we see it across multiple systems.
Liver markers like AST and ALT are considered “normal” up to around 40, but values in the 30s can already indicate mild to moderate inflammation, often tied to fatty liver and metabolic dysfunction.
Hormones are another example. A postmenopausal woman can have estrogen, progesterone, and testosterone levels of zero and still fall within a “normal” range. But if she has low muscle mass, poor bone density, and declining function, that’s not something I would consider acceptable.
Normal ranges are based on the general population.
And the general population is not a great benchmark for optimal health.
What we’re really talking about is a shift in approach.
It's known as Medicine 3.0, but at its core, it’s simple. You are an active participant in your own health.
We use deeper biomarkers. ApoB instead of standard cholesterol panels to better understand plaque-causing particles. Inflammatory markers to identify long-term risk. Fasting insulin to catch metabolic dysfunction early.
We measure VO₂ max because it’s one of the strongest predictors of longevity we have.
We use DEXA scans because body composition tells the truth. You can look “normal” on a scale and still carry dangerous levels of visceral fat, which is one of the strongest indicators of poor metabolic health.
And we use continuous glucose monitoring because it shows how your body actually behaves in real time. Not averages. Reality.
That’s where people are often surprised.
A common example is alcohol. Many people assume wine is harmless because it doesn’t spike blood sugar immediately. And they’re right, in the moment.
But what they don’t see is what happens later.
In the middle of the night, blood sugar rises. Heart rate increases. Body temperature goes up. Sleep quality drops.
They wake up feeling off, and they don’t connect it back.
That’s the value of actually seeing what’s happening.
What I try to give people, especially those already putting in effort, is direction.
Most people know how to work out. Most people know what they should be eating. But they’re often inefficient, inconsistent, or unknowingly working against themselves.
When you align exercise, nutrition, and lifestyle with how the body actually responds, everything becomes more effective.
And when you re-measure those metrics three or four months later, you can see the change.
That’s what builds momentum.
To me, being healthy isn’t about not being sick. It’s about maximizing the amount of time you spend fully capable. Able to move, think, and function at a high level without limitation.
Because when those systems are aligned, life gets better.
And the people thriving in their fifties, sixties, and beyond didn’t get there by accident. They started paying attention earlier.
There’s a line from Walt Whitman that captures it well: “The periods of middle and old age are perhaps the finest… a well-trained person, through middle age and old age, towering in its ripeness and completeness… and indeed, transcends them.”
That’s the goal; not just living longer, but living better.
About Jesse Greer, MD
Founder, Preamble Health
A former Green Beret, Special Forces Flight Surgeon, and Internal Medicine physician, Dr. Jesse Greer brings a mission-first mindset to everything he does, grounded in performance, resilience, and precision. Based in Scottsdale, Preamble is Arizona’s leading Medicine 3.0 clinic, designed to prevent the preventable.
“What people don’t always recognize is that performance and longevity are not the same thing. ‘Fine’ is not the same as optimal. That’s not performance; that’s basic function. The goal is not just living longer, but living better.”