You change the oil in your car more than you check the oil in your body.

Most people can tell you the last time they got an oil change. Ask about the last time they got blood work, and you get a shrug. Maybe a physical a couple years back. Maybe when a doctor made them.

That's backwards, and it's costing you more than you think.

Someone gave me a phrase years ago, and I don't even remember who. But it stuck. If you're changing the oil in your car more often than you're checking the oil in your body... something's wrong with your priorities.

Your car is a machine you can replace. Your body isn't.

The quick-fix trap

We're wired for the shortcut in this country. Something feels off; we want a pill, a powder, a hack we can buy that makes it go away without having to understand it.

Watch how differently we treat everything else we own. Your grass looks rough, you don't dump Miracle-Gro on it and hope. You figure out what's wrong first. Your car runs funny, you don't guess, you get a diagnostic before throwing money at parts.

But your own body? People take a supplement because a friend swears by it, or an ad hit at the right moment. No diagnostic, no idea what's actually going on inside them. Just vibes and a monthly Amazon subscription.

You'd never fix your car that way. Don't fix your body that way.

It starts with a number

Your health is 100% your responsibility. Not your doctor's, not your trainer's, not the supplement company's. Yours. And you can't take control of something you refuse to measure.

An annual physical is the floor. The minimum if you say you take your health seriously. Go get it, get the blood draw. That's a start. But one test a year is a snapshot, and a snapshot lies to you.

One test tells you almost nothing

Your body isn't a fixed number. It moves.

Take hormones. As you get older this becomes a bigger deal, and I'm feeling it myself at 40. Your testosterone, your estrogen, man or woman... those aren't a static reading you grab once and file away. They cycle. They shift with the time of day you got the draw, your sleep, how hard your last few weeks have been. Stress alone moves them.

So picture it. You get one test, it comes back low, and a doctor starts talking about hormone replacement therapy. Based on what? One reading, on one morning, after one bad week? You have no idea if that's your real baseline.

Now picture the version of you who's been testing twice a year for four years. You don't have a number, you have a trend. You know your average, your range, what a normal week looks like versus a rough one. That person doesn't get talked into a treatment they don't need.

Cholesterol works the same way. Some people run naturally higher their whole lives, and a level that's high but stable over years tells a different story than one that suddenly spikes. I'm not here to give you medical advice on your numbers. That's between you and your doctor. But a trend tells a story. A single dot on a graph tells you nothing.

The position of strength

You've been tracking for years. One quarter, a marker jumps. You catch it in ninety days instead of eighteen months, walk into the doctor's office, and show them exactly when it moved and what it's been every other time. You're not starting from zero.

Now the other guy. Never tests. Feels like garbage for six months, finally drags himself in, and the doctor's flying blind. No history, no baseline, no idea what's normal for the person in front of them.

Same symptom, two different levels of care. One had the data. The other waited to feel it.

That's the trap. Wait until something feels wrong before you check, and you're already behind—every time.

So here's the cadence I'd start with. Twice a year for a real trend line. If you're working a specific marker, go quarterly until it's dialed in. If you want an easy on-ramp, Function Health is worth a look. It runs a comprehensive panel through Quest with a six-month follow-up on the key markers, the app makes it simple, and you can add tests based on your family history or whatever you're watching. Easiest way I've seen to start building the history without piecing it together yourself.

What about supplements?

Once you know what's actually going on inside you, supplements start to make sense. Not before.

The word itself is the tell. Supplement. It fills a specific gap you've identified. It was never meant to be the whole strategy. Start with food, always. Reach for a supplement when you've got real evidence your body is short on something. Not because it's trending. Not because your buddy at the gym is stacking it. Not because the label promised you energy and better sleep and a flatter stomach.

Plenty of these are good companies making good products. That's not the argument. The argument is that not everyone needs every supplement on the shelf, and the only way to know which ones you need is to measure first. Otherwise you're back to dumping Miracle-Gro on the lawn and praying.

Why this is the one that matters

You can build the business, stack the money, pour everything into the family. None of it holds up if the machine running the whole operation breaks down.

Nothing else matters if you're not healthy. It's the foundation the rest of it stands on, and it's the one most driven people quietly ignore while they optimize everything else.

So treat your body like the asset it is. Get the baseline, build the history, make the trend line your early warning system instead of waiting to feel the pain.

One more time, because I want it to stick. If you're changing the oil in your car more often than you're checking the oil in your body... you already know what you need to do.

Go get the blood work.