Longevity · Vitality

Right now, as you read this, your body is using energy. Not as a figure of speech. Really.

Your heart is beating. Your brain is thinking. Your cells are busy repairing themselves and clearing away damage. Every one of those jobs costs energy — and your body pays for it with a molecule called ATP.

ATP: The Currency Of Life

ATP is your body's energy currency. Whenever a cell needs to do something, it "spends" ATP. It's the only way it can pay.

Here's the surprising part: you barely hold any. At any moment, you only have a few seconds' worth. You stay alive not by storing energy — but by making it fresh, every single second.

Mitochondria: The Engine

So where does ATP come from? From tiny structures inside your cells called mitochondria — think of them as microscopic power plants.

You have hundreds or thousands in most cells, and tens of thousands in the parts of you that work hardest: your heart, muscles and brain. They take the food you eat and the oxygen you breathe and turn them into energy. That's the real reason you breathe — not just to take in air, but to turn fuel into energy, cleanly enough to run a human being.

Illustrative — the parts that work hardest hold the most power plants, so they feel it first when energy runs low.

NAD⁺: The Delivery Service

But your power plants can't do it alone. To turn fuel into energy, they need to move tiny electrical charges — called electrons — from one place to another. And those charges need something to carry them. That carrier is NAD⁺.

NAD⁺ picks up energy from the food you break down and drops it off at your power plants, where it becomes ATP. Think of NAD⁺ as the delivery van, and ATP as the parcel it delivers. No van, no delivery — and no energy.

This is why you may have heard so much about NAD⁺ lately. It isn't magic. It simply sits right at the heart of how your body makes energy.

Why this is the story of aging

Here's the part that changes everything. As you get older, this whole system slows down. Your power plants make less energy. There's less NAD⁺ to carry it. And your cells become less able to make and use the energy they need.

That matters because repair is expensive. Healing, clearing out damaged cells, calming inflammation, keeping your muscles and brain strong — all of it runs on the same energy. When your body makes less energy than it needs to repair itself, damage starts to build up faster than it can be fixed.

That, I believe, is where aging really begins. It's why I developed the Energy Theory of Aging: the idea that aging isn't about one failing molecule, but the moment your energy can no longer keep up with the work of staying healthy.

So what should we actually do?

This changes what good longevity care should aim for. It isn't about chasing one number on a blood test, or swallowing a single supplement. It's about looking after the whole system:

Energy isn't one molecule. It's a whole system. And looking after that system may be one of the most important things you can do for how well — and how long — you live.

Vitality isn't a vague idea. It can be measured. It's the energy your cells can make — and everything that energy lets you do. That's what we're here to protect.