We brush our teeth every day. Not because today’s brushing matters much. One skipped night won’t cost you a tooth. We do it because of what happens after 10,000 missed nights. Cavities. Gum disease. Teeth we’d like to still have at 80.

Preventive medicine works the same way. And I don’t think most people realize that.

Ask someone why they want to be healthy, and the answer is usually “so I don’t get sick. “True, but it stops one layer too shallow. Push one layer deeper and the real answer shows up: we want to be healthy so we can move. So we can breathe without effort. So we can walk to the store, or so that we can get down on the floor with a grandkid, and get back up again without thinking about it.

That’s the actual goal. Not the absence of disease. It’s the presence of function, for as long as possible.

The Invisible Middle

Here’s what makes prevention hard to take seriously: none of the daily choices feel like they matter much in the moment.

Smoking a cigarette today doesn’t give you COPD today. Skipping vegetables this week doesn’t cause insulin resistance this week. The damage is invisible, until it isn’t. Fifty years of smoking becomes irreversible lung disease. Years of unmanaged blood sugar can lead to type 2 diabetes. The choice was small every single day, yet the consequences weren’t small at all.

I notice this in my own life, on a smaller scale. Wheat gives me joint pains. Dairy gives me skin breakouts and digestive issues. Neither shows up as a crisis today. It’s just a little ache, a little inflammation, so easy to brush off. But play either one forward for years of daily use, and you’re looking at arthritis on one end with probable joint replacements, chronic skin and gut problems on the other, which could lead to colitis or even worse (cancer). That’s the invisible middle: the space between “this feels fine” and “this became permanent,” where almost nobody is paying attention.

This is why prevention is a hard sell. The reward is decades away, and the cost is due today. But it’s also exactly why it matters. You’re not choosing between “healthy” and “unhealthy” today.

You’re choosing which version of yourself shows up 20 years from now.

And here’s the part that should change how we think about it: some of that damage can be reversed if you catch it early enough. Early insulin resistance can be turned around. Mild inflammation can be calmed down. But full-blown COPD, advanced heart disease, and joint destruction can’t be reversed. They’re just managed.

The scary part isn’t crossing that line. It’s that there’s no alarm bell when you do. You don’t feel the day you go from “fine” to “on the other side.” You just wake up there.

Which is exactly why it’s worth checking in on yourself now, before you have a reason to.

The Test You Can Run on Yourself, Right Now

Forget lab values for a second. Before any bloodwork, your body is already telling you something. You just have to know what to listen for. Try a few of these:

• Stand up from the floor without using your hands.
• Carry both grocery bags in from the car in one trip.
• Stand on one leg while you put on your socks.
• Climb two flights of stairs without stopping to catch your breath.
• Reach behind your back and scratch between your shoulder blades.

None of these requires an appointment. You can test yourself in your living room right now. And the reaction that matters is the honest one. Is it, “yeah, no problem,” or “that was harder than it used to be.”

That second reaction isn’t just aging. It’s a signal. And it’s the most useful piece of information you have, because it’s the first one your body gives you — long before a diagnosis has a name.

What’s Underneath the Signal

A functional test tells you that something has shifted. Labs tell you why.

Struggling to get up off the floor or losing your grip strength? That can trace back to low vitamin D, low ferritin, declining testosterone or DHEA-S, or early insulin resistance — all things that quietly erode muscle before anyone notices.

Feeling unsteady on one leg? Often connected to vitamin D, B12, or magnesium — nutrients your nerves and muscles depend on to coordinate with each other.

Winded going up the stairs? One of the most common causes is low iron or low-grade anemia, something a basic panel picks up easily, and something people live with for years without knowing.

This is the part I love about combining function with labs: two people can fail the same test for two completely different reasons. One person’s stair-climbing struggle might be thyroid.

Another might be blood sugar. Same symptom, different biology — which is exactly why genomics and personalized lab work matter. It’s not about running more tests for the sake of it. It’s about finally understanding your mechanism, not guessing.

The Real Stakes

Picture two people, both turning 80 next year.

One is still hiking on weekends, driving herself to appointments, living independently, getting down on the floor to play with her grandkids, and getting back up without a second thought.

The other is managing five medications, dependent on family for basic tasks, in and out of the hospital, watching life get smaller.

Nothing separated them on any single day. It was the thousands of small choices, repeated for decades. What they ate, whether they moved, and whether they caught small problems while they were still reversible.

That’s the whole point of preventive medicine. It was never really about avoiding a diagnosis. It’s about which version of 80 you’re building, one ordinary day at a time.

Curious what your own biology is telling you? A genomic panel and a few key labs can often explain — years in advance — exactly which functional decline you’re at risk for, and what to do about it while there’s still time to change course. Book a consult to find out where you stand.