The Gas Your Body Makes to Keep Your Heart Young

Drew, your body makes a gas. On purpose. That's the opening.

Correct. Not a byproduct, not an accident — your arteries literally manufacture nitric oxide to keep themselves healthy. It's a Nobel Prize molecule hiding in your blood vessel walls.

Nobel Prize! So what's it actually doing in there?

Okay — eNOS, endothelial nitric oxide synthase — that's the enzyme that makes it. Think of it as the crew inside your artery walls that keeps releasing a 'relax, everybody' signal to the muscles wrapped around those vessels.

And when those muscles relax, the vessel widens?

Exactly. Blood flows freely, pressure drops, your heart doesn't have to work as hard. The problem is eNOS activity drops as we age, so the signal gets quieter and arteries stiffen.

So we just need to turn the volume back up. How?

Exercise is the loudest knob. Aerobic exercise — brisk walking, cycling, swimming — physically shears blood along the vessel wall and tells eNOS to crank it out. This is not a maybe, the evidence here is solid.

What about food? Because I'd like vegetables to be useful for once.

They are! Leafy greens and beets are high in dietary nitrates — your mouth bacteria convert those into nitrite, and your body converts that into nitric oxide. So chewing arugula is literally making a gas. You're welcome.

Amazing. What about mouthwash, because I feel like there's a catch coming.

There it is. Antibacterial mouthwash kills the mouth bacteria you need for that conversion. Research suggests heavy daily mouthwash use might blunt some of the nitric oxide boost from vegetables. So maybe don't gargle like you're fighting a war.

Supplements? I know people take L-arginine for this.

L-arginine is what eNOS uses as raw material to make nitric oxide. Supplementing it sounds logical but the evidence is mixed — some people see benefits, many don't. L-citrulline actually converts to arginine more efficiently and looks a bit more promising, but we're not in slam-dunk territory yet.

What about sauna? I feel like you're about to say sauna.

I'm always about to say sauna. Heat stress does appear to stimulate nitric oxide production. Regular sauna use is associated with meaningful cardiovascular benefits in the research, though it's hard to isolate exactly why.

Okay, one thing someone can do Monday morning.

Go for a brisk twenty-minute walk before breakfast. Eat a big handful of leafy greens at lunch. Skip the mouthwash that day. That's three levers, zero pills, and your eNOS will notice.