Proof & Practice is a health newsletter that bends with your life instead of breaking. Every Saturday, I share what the science says, the principle behind it, and the tools and skills to apply it your way — so your health habits finally stick. No perfection required. From a board-certified lifestyle medicine clinician.
Hello, my friends!
You can eat healthy, exercise, sleep well, take care of yourself... and still get sick.
Still get cancer. Still develop heart disease. Still end up with some chronic condition you never saw coming.
And I think this is where people look at healthy living and go, "Well... then what's the point?"
The Story That Sticks
I’ve had conversations like this far too many times than I can count.
Someone tells me about a friend who was incredibly fit, exercised every day, ate really well, and still got sick. Or they bring up the opposite: the person who smoked their whole life, never exercised, and somehow lived into their 90s.
Hear enough of those stories and you start wondering:
Does any of this actually matter?
The Real Problem
Here's the issue. We're expecting healthy habits to give us something they can never give us.
A guarantee.
That's not how health works. The goal isn't to eliminate the possibility that something bad will happen. It's to improve the odds of what happens next.
But sometimes we treat health like a transaction:
I exercise, therefore I shouldn't have a heart attack.
I eat healthy, therefore I shouldn't get cancer.
I do everything I'm supposed to do, therefore I should stay healthy.
Then someone does all of it and still gets diagnosed, and the whole system feels like it failed.
You see this with Bryan Johnson, who has put extreme attention into his health and still developed an autoimmune condition. Or Chef AJ, who ate plant-based for years and still developed cancer.
Those aren't proof that healthy habits don't work. They're just examples of the stories people notice.
But that "see, what's the point?" conclusion only makes sense if the original promise was that healthy habits make you immune to disease.
They don't. They never did.
The Seatbelt Analogy
The way I think about this is simple.
It's like wearing a seatbelt.
You can wear one every single time you get in the car and still die in an accident. That can happen. But we don't look at someone who died while wearing a seatbelt and say, "I guess seatbelts don't work."
Because that was never the promise.
A seatbelt doesn't make you crash-proof. It changes your odds. It gives you a better chance.
That's much closer to how health habits actually work:
Eating well doesn't mean you'll never get sick.
Exercising doesn't mean you'll never develop disease.
Good sleep doesn't give you a force field.
You're influencing risk. You're putting yourself in a better position. That's different from controlling the outcome.
Our brains get pulled toward the exceptions. The healthy person who suddenly gets sick is memorable because it's surprising. The lifelong smoker who lives to 100 is memorable for the same reason. Those are the stories we tell.
After a while, those unusual examples start to feel like evidence that our choices don't matter.
There's something comforting in that idea, too. If nothing matters, there's nothing to change. No responsibility. Just, "Whatever happens, happens."
But we're missing something. Preventing disease isn't the only reason to take care of yourself.
What I've Seen
As a physical therapist, I've seen the other side of this.
I've worked with people who absolutely have chronic disease. They're not disease-free. They didn't escape everything. But they're still moving, still independent, still working, still doing the things they care about.
And sometimes I look at them and think... imagine where they'd be if they hadn't spent years moving their body, building strength, staying active.
The disease still happened. But that doesn't mean all those years of healthy habits did nothing.
Maybe we've been asking the wrong question.
Instead of only asking, "Can these habits stop me from ever getting sick?" there's another question:
"What kind of condition will I be in if I do get sick?"
That's a very different way of thinking. Now we're not just talking about prevention. We're talking about capacity:
Strength to work with
Mobility
Cardiovascular fitness
The ability to tolerate what life throws at you and recover from it
None of that makes you invincible. It just means you're building a better foundation.
Why It's Personal
This is personal for me.
I've had cancer. I'm in remission, but I know remission isn't a guarantee it won't come back. I'm at risk of recurrence. I could develop another type of cancer. Other health problems could happen.
There are things here completely outside my control, and I've had to accept that.
But accepting it doesn't make me think, "Screw it, none of it matters." It makes the reason I take care of myself clearer.
I try to eat healthy, exercise, get enough sleep, take care of my body. Not perfectly. There are days I don't eat the way I wanted to. Weeks where exercise doesn't go to plan. Sometimes life gets busy.
I'm not trying to win a health competition. I'm trying to stack the odds in my favor. That's it.
This matters especially if you're a busy professional who's started to feel like taking care of your health means doing everything perfectly.
It doesn't.
You don't need a flawless morning routine, a perfect diet, or an optimized life. You need habits you can keep coming back to.
Because we're not trying to control every possible outcome. We're building a foundation that puts us in a better position for whatever comes.
The Point
So yes. You can live a healthy lifestyle and still get sick. You can do a lot right and still have something happen you didn't choose and couldn't prevent.
That's real.
But the conclusion from that isn't that taking care of yourself is pointless. For me, it's almost the opposite.
I take care of myself because I know I can't control everything. I can only influence what I can influence:
I can move my body
I can build strength
I can make reasonable choices about what I eat
I can try to sleep
I can keep showing up without expecting perfection
And whatever happens from there... happens.
Healthy living isn't a guarantee. It's one way of stacking the odds in your favor. For me, that's enough reason to keep doing it.
Hit reply and tell me which one thing from that list you're actually going to come back to this week.
Or tell me your own version of this story: the person who did everything right and still got sick, or the one who didn't and still got lucky.
I read every reply.
Stacking the odds with you,
Grazelle 🌱
PERSONAL UPDATES
BEFORE YOU GO
When you're ready, here are 2 ways I can help you:
1. The Dial Method — Get a consistency system that works on your worst weeks, not just your best ones. Five levels across five health pillars. Adjust instead of restart.
2. The Plant-Based Fast-Start for Busy Professionals — Get the no-perfection playbook for eating more plants without overhauling your life. Built for full schedules, not ideal weeks.

