Why You're Tired All the Time (Your Cells Know)

Drew, I need you to explain something. I eat, I sleep, I do everything right, and I'm still tired by two in the afternoon. What is happening inside me?

Your cells are being dramatic. But also, your energy system is genuinely getting less efficient, and it starts earlier than you'd think.

Okay so walk me through it. How does a sandwich actually become the thing that makes my arm move?

So your digestive system breaks the sandwich into glucose — simple sugar. That glucose travels to your cells and gets hit by glycolysis — which is just cells cracking sugar in half to release a little burst of usable energy.

That's it? Just cracking sugar?

That's the starter pistol. The real production happens next, inside the mitochondria — ATP synthase, the enzyme that actually stamps out ATP, adenosine triphosphate, your body's universal energy coin. Every movement, every thought, every heartbeat spends ATP.

And with age that factory gets slower?

The machinery degrades. Fewer mitochondria, leakier ones, less ATP per glucose. Your cells are still doing the math, they're just working with a busted calculator.

That is a genuinely depressing image. So what do we actually do about it?

Exercise is still number one — specifically mixing cardio with resistance training. Cardio signals your cells to build more mitochondria. Resistance training makes each one run hotter. Together they're the strongest metabolic intervention we have.

What about supplements? Everyone's talking about NMN, NAD, all of that.

NAD is a molecule your mitochondria desperately need, and it does drop with age. NMN and NR are precursors — the raw ingredients. Early human data looks promising, but we don't have long-term outcome trials yet. Honest answer: interesting, not proven.

What about sauna? My gym has one and I've been avoiding it because it smells like someone's dad.

Do it anyway. Regular heat exposure improves mitochondrial function and metabolic flexibility — that's your body's ability to switch between burning sugar and fat. Four sessions a week, studies suggest meaningful benefit.

And food timing? I keep hearing eat breakfast like a king, skip dinner, eat only on Tuesdays —

The research actually does support front-loading calories earlier in the day. Your glucose handling is better in the morning. Eating a big meal at ten PM is just asking your metabolism to do calculus drunk.

Okay, give me the one thing. Monday morning, what do I actually do?

Take a twenty-minute walk after breakfast. It clears glucose from your blood, signals your cells to build more mitochondria, and costs you nothing. Everything else is optional. That one's not.