My name is Elizabeth. I’m 35, I love health, writing, and understanding how the body works when it tries to send us messages.
One question I hear all the time from friends and readers is: why do I feel tired all the time? You sleep, you try to eat decently, maybe you even stay active. But the energy just isn’t there. It feels like a fog is always hanging over your head. If that sounds familiar, you’re in the right place.
Your body changes after 25
We don’t always notice it, but after your mid-twenties, your body starts to shift in subtle ways. One of the changes that matters most for energy is a drop in NAD+ levels. This is a molecule your cells need to produce energy. Less NAD+, less fuel. It’s natural, but it doesn’t have to slow you down
Lots of people hit their 30s and suddenly feel less sharp, more tired, and even emotionally flat. Instead of brushing it off, it’s worth digging into the deeper causes.
Poor sleep habits
Let’s start with the obvious one. Bad sleep drains you faster than anything else. It’s not just about getting 7or 8 hours. If your sleep is shallow, inconsistent, or interrupted by blue light, caffeine, or stress, it won’t restore you
Sleep is where your body repairs itself. It’s when your brain resets. And if you sleep cycle is off, your energy and focus are going to pay the price. Even one hour less than you need can mess with your memory and mood the next day.
Food that fuels nothing
The food we eat is supposed to energize us, but modern diets often do the opposite. Processed snacks, too much sugar, empty carbs—they spike your blood sugar, then drop it. That crash leaves you mentally slow, physically drained, and craving more junk.
Your brain needs healthy fats, B vitamins, magnesium, iron. A lack of those especially B12 and iron can lead to long-term fatigue, even if you’re technically “eating enough.
And here’s the twist: even if you eat the right things, stress or gut issues might keep your body from absorbing the nutrients you need.
The slow burn of chronic stress
Stress doesn’t always feel like panic. Sometimes it’s just a constant hum in the background. But over time, it adds up. When your brain feels under pressure 24/7, your body produces more cortisol. That hormone throws everything out of balance your sleep, your digestion, your ability to focus.
Most of us live in stress without even realizing it. But your body knows. The signs show up as fatigue, brain fog, tension, and that general sense of dragging through the day.
Breaking that cycle doesn’t have to mean quitting your job ormoving to the mountains. Sometimes, it’s as simple as taking a 15-minute walk, breathing more deeply, or setting better boundaries.
Not moving… or moving too much
When you sit for hours every day, your body slows down. Your circulation, metabolism, and mental clarity drop. But too much exercise without proper rest does the same. Your body needs movement, but also recovery.
The sweet spot is moderate, consistent movement. A brisk walk, a few short stretches, or light strength training can wake up your body without wearing it out.
When there’s something deeper going on
If you’ve improved your habits and you still feel exhausted, it might be something more. Hormonal imbalances, early thyroid issues, blood sugar swings, or even subtle nutrient deficiencies can all cause long-term tiredness.
That’s where targeted support can help. Supplements that naturally boost NAD+ production, for example, support the body’s ability to generate energy from within. You’ll find more on that in this science-backed approach to boosting energy and focus naturally.
Conclusion
You’re not imagining it. If you’ve been feeling tired all the time, there’s a reason. And when you understand what’s happening, you can start making real changes that actually work.
Want to know how NAD+ fits into this? Read What is NAD+ and why it matters for your energy. And if you’re looking for fast results, check out Natural brain booster that works in just one day.
