I want to start with something I believed for way too long.
I thought I was just tired because life was hard. Divorce. Kids growing up and leaving. Starting over. I told myself — okay, this is just what getting older feels like. You slow down. You accept it.
I was wrong. And I wish someone had told me sooner.
The thing nobody explained to me
There is a molecule in your body called NAD+.
Never heard of it? Neither had I. But once I learned what it does, and what happens to it after 50, everything started to make sense.
NAD+ is basically the fuel that runs every single cell you have. Your energy, your skin repair, your brain, your metabolism — all of it depends on NAD+ to function. It is like the electricity in your house. When it is flowing, everything works. When it drops, things start going dark.
Here is the part that stopped me cold when I read it.
Between your 40s and your 60s, your NAD+ levels drop by almost half.
Not a little. Half.
So if you feel like someone quietly turned down the power in your body without telling you — that is literally what happened. Your cells are running on half the energy they used to have. And nobody told you that was coming.
The phone battery analogy (because this finally made it click for me)
Think of your body like a phone.
When you are 25, your battery is fully charged. You wake up at 100%. You burn through the day, you recharge overnight, you wake up at 100% again. Easy.
After 50, your battery does not charge all the way anymore. You go to sleep at 60%, you wake up at 40%. You make it through the morning okay. By 2pm you are running on 15% and wondering why you feel like you need a nap just to exist.
That is not weakness. That is not laziness. That is your NAD+ talking.
And here is the thing about a phone battery — it is not just about charging. Some things drain it faster than others. Leave the GPS on all day, run ten apps in the background, and even a good battery dies by noon.
Your body works the same way.
What drains your NAD+ faster
This is where it gets real, because some of these I was doing every single day without knowing.
Alcohol is a big one. Even one or two glasses a few nights a week burns through NAD+ faster than your body can replace it.
Poor sleep too. Not just feeling groggy. Actual cellular depletion happens when you cut sleep short, because most of your NAD+-dependent repair work happens at night.
Stress. Chronic stress, the kind that sits in your chest for months at a time, eats through NAD+ like nothing else.
Ultra-processed food, too much sugar, not enough movement. All of it pulls from the same depleted account.
I looked at that list after my divorce and thought — I am doing almost all of these. No wonder I felt like I was running on empty.
What actually helps
The good news is that NAD+ responds to what you do. It is not fixed. You have more control than you think.
Morning sunlight is one of the simplest things. Ten minutes outside without sunglasses in the morning resets your circadian rhythm and supports NAD+ production. Free. Takes no time. I started doing this and noticed a difference within two weeks.
Exercise is another one, specifically anything that gets your heart rate up or challenges your muscles. Not punishing yourself. Just moving consistently. Even 20 minutes a day matters.
Protein. Your body needs amino acids to produce NAD+, and most women over 50 are not eating enough protein. Aim for 25 to 30 grams per meal. That is two eggs plus some Greek yogurt for breakfast. Not complicated.
Sleep. Actually protect it. Lights down by 9pm, no screens, cool room. Your cells are doing serious repair work between 10pm and 2am. Let them.
And then there is NMN.
NMN (nicotinamide mononucleotide) is a compound your body uses as a direct building block for NAD+. It is not a stimulant, it is not caffeine, it does not give you a fake buzz. It just gives your cells the raw material they need to produce more of what they have been running low on.
I started taking it every morning about a year ago. I was skeptical, honestly. But about three weeks in I noticed I was waking up before my alarm. My afternoon energy crash, which I had accepted as just my life, stopped being a daily thing.
I am not saying it works the same for everyone. I can only tell you what changed for me. If you want to look at what I take, I have linked it here. Not pushing it on anyone. But if you are exhausted and nothing is making sense, it might be worth reading about.
The thing I want you to take away
The tiredness you feel is not a character flaw.
It is not because you are weak, or soft, or aging badly, or not trying hard enough.
It is biology. Specifically, it is a molecule called NAD+ declining in your body at a rate nobody told you to expect.
And biology, unlike a lot of things in life, responds when you give it what it needs.
Start with the sleep. Add the morning sunlight. Eat more protein. Move your body even when you do not feel like it. And if you want to go a layer deeper, look into what I mentioned above.
You do not have to accept running on empty. That is not what 50 something looks like when you actually understand what is happening inside your body.
I am proof of that. And I am just getting started.