“I slept eight hours…so why am I still so tired?”
I hear this all the time.
If you’re a woman over 40 and feel exhausted despite getting enough sleep, you’re not alone. As a nutritionist, I’ve worked with hundreds of women who come to me because they’re exhausted. They assume they need more sleep, more coffee, or maybe they’re just “getting older.”
As a 48-year-old solo momma, business owner, and someone juggling all the same responsibilities many of my clients are, I understand that feeling too. There are certainly seasons where life is busy. But what I’ve learned—both personally and professionally—is that energy isn’t just something you wake up with. It’s something you build.
Sleep absolutely matters. But it’s only one piece of the puzzle.
Your energy is influenced by the food you eat, how your digestive system functions, how much mental energy you’re spending every day, your hydration, your stress response, and the daily habits that either support your body or slowly drain it.
The good news?
Many of these things are within your control, and you don’t have to overhaul your life to start feeling better. Feeling over 40 doesn’t need to mean feeling exhausted all the time.
Let’s look at eight hidden reasons your body may be asking for more.
1. You’re Riding a Blood Sugar Rollercoaster
One of the first things I look at with a client who feels exhausted isn’t their sleep—it’s their eating pattern.
Did breakfast consist of coffee and a piece of toast?
Was lunch skipped because work got busy?
Did you go six hours without eating and then find yourself reaching for whatever was easiest?
Your body is incredibly smart. It can’t create steady energy if it isn’t receiving a steady supply of fuel.
When blood sugar continually spikes and crashes throughout the day, your energy often follows the same pattern. You might feel alert for an hour, then suddenly find yourself needing another coffee or craving something sweet by mid-afternoon.
Rather than relying on quick fixes, focus on building meals that include protein, fibre and healthy fats. They digest more slowly, helping provide steadier energy that lasts longer.
2. You’re Not Eating as Much Protein as You Think
This is one of the biggest surprises I see when reviewing food journals.
Many women believe they’re eating plenty of protein, but when we actually add it up, breakfast might provide only 8-10 grams, lunch another 10-15 grams, and dinner becomes the only meal with a meaningful amount.
Your body doesn’t benefit from saving all your protein until dinner.
Protein helps support muscle health, keeps you feeling satisfied, supports blood sugar balance and provides a steady source of energy throughout the day.
Instead of worrying about counting every gram, think practically.
Can you include a quality source of protein at every meal?
A palm-sized portion is often a simple visual that works well for many women. Greek yogurt, eggs, tofu, beans, lentils, edamame, fish, chicken, cottage cheese or nuts and seeds can all help increase your intake. For more on protein, you should really read this — The Secret to Aging Well: How Protein Supports Healthy Aging.
Small improvements throughout the day often make a much bigger difference than trying to “catch up” at dinner.
3. You’re Missing Out on Fibre (Without Realizing It)
If you’ve worked with me before, you probably knew fibre was going to make this list.
I talk about it all the time because it impacts almost everything.
Your gut health.
Your blood sugar.
Your cholesterol.
Your fullness after meals.
Your microbiome.
And yes…your energy.
Current recommendations are moving toward about 50 grams of fibre each day, yet most Canadians aren’t even reaching the previous recommendation of 30 grams.
But here’s the good news.
I don’t want you walking around with a calculator trying to hit a number.
Instead, reduce the friction.
Aim to fill half your plate with fruits and vegetables at lunch and dinner. Include beans or lentils most days. Enjoy one or two palmfuls of nuts and seeds throughout the day.
Those simple habits naturally increase fibre without making healthy eating feel complicated.
Healthy living should feel doable—not like another math assignment.
4. Your Gut May Be Working Harder Than You Think
Many women don’t realize that fatigue and gut health can be connected.
Your digestive system isn’t just responsible for digesting food. It’s where nutrients are absorbed, where trillions of beneficial bacteria support your health, and where much of your serotonin—the neurotransmitter involved in mood, sleep, and overall well-being—is produced.
When your gut isn’t functioning well, your body may struggle to absorb the nutrients it needs to create energy efficiently.
Sometimes the signs are obvious, like bloating, constipation, reflux or irregular digestion.
Sometimes they’re much quieter.
Low energy.
Brain fog.
Poor concentration.
And once women hit 40, this can feel like exhaustion, regardless of how much quality sleep you are getting.
Feeling like you’re doing everything “right” but still not feeling your best.
It’s one of the reasons I so often begin with gut health. When we improve the foundation, many other pieces begin to improve alongside it.
5. Your Brain Is Working Overtime
This may be the most overlooked reason of them all.
By the time many women finish their workday, they’ve already made hundreds—if not thousands—of decisions.
Work decisions.
Family decisions.
Appointments.
Groceries.
School schedules.
Sports.
Aging parents.
Finances.
Remembering birthdays.
Coordinating everyone’s lives while somehow trying to take care of themselves too.
This invisible mental load is exhausting.
There is actually a name for part of this: decision fatigue.
The more decisions we make throughout the day, the harder it becomes to make thoughtful ones later.
That’s why staring into the fridge at 6:00 p.m. wondering what’s for dinner can feel completely overwhelming.
It’s also why I teach concepts like Meal Think, Thinking in Pairs, and Anchor Habits.
They’re not about becoming more productive. They’re about reducing friction. When healthy choices become easier to make, they require less mental energy. And when life inevitably gets busy, those simple systems continue doing the heavy lifting.
If you’re curious about brain health, check out the Brain Health Quiz for Women 45+…it’s a great place to start.
6. You’re Constantly Powering Through
This one hits close to home.
As a solo momma running a business, there have been many moments where I’ve caught myself thinking,
“Once this project is finished…”
“Once things slow down…”
“Next month I’ll get back on track.”
But if there’s one thing life has taught me, it’s that there’s almost always another project, deadline, commitment, or season that feels busy. The problem is, our health doesn’t wait until our calendar clears.
Many women become incredibly good at looking after everyone else while putting themselves at the bottom of the list.
They power through.
Ignore the signs.
Keep going.
Until one day, exhaustion feels normal.
Taking care of your health isn’t something you earn after everything else is done. It is what gives you the energy to do everything else in the first place.
7. You’re More Dehydrated Than You Think
If I’m being completely honest, this is one I still have to work on myself.
Especially during the summer. I get caught up with clients, writing, media interviews or momma life and suddenly realize it’s mid-afternoon and I’ve barely touched my water bottle. The difference I feel when I consistently stay hydrated is remarkable.
It sounds almost too simple, but your body literally runs on water.
Every cell.
Every organ.
Every system.
Hydration supports digestion, circulation, nutrient transport, concentration, temperature regulation and energy production. Sometimes that afternoon slump isn’t your body asking for another coffee. Sometimes it’s asking for a glass of water.
8. Low-Grade Inflammation Could Be Quietly Draining Your Energy
Inflammation often gets a bad reputation, but it’s actually one of your body’s natural defence systems.
When you cut your finger or catch a virus, inflammation helps your body heal.
That’s a good thing.
The challenge comes when low-grade inflammation quietly lingers over months or years.
Poor nutrition.
Chronic stress.
Poor sleep.
Inactivity.
Blood sugar imbalances.
Gut health challenges.
These can all contribute to keeping your body’s alarm system switched on, and that constant repair work takes energy. It is one of the reasons an anti-inflammatory lifestyle is so important.
Not because it’s trending but because it’s really about disease prevention.
Eating plenty of colourful fruits and vegetables, choosing fibre-rich foods, moving your body regularly, managing stress, sleeping well and supporting your gut all help calm unnecessary inflammation while supporting your long-term health.
Energy Isn’t Something You Find—It’s Something You Build
If there’s one message I hope you take away from this article, it’s this:
Your body isn’t working against you, it is communicating with you.
Feeling exhausted isn’t always about needing another hour of sleep. Sometimes it’s your body asking for steadier fuel, more fibre, better hydration, less decision fatigue, healthier routines or a little more care.
The goal isn’t perfection.
It’s creating simple systems that make healthy living feel easier.
That’s why I talk so often about reducing friction, Meal Think, Thinking in Pairs and Anchor Habits. They aren’t just healthy habits—they’re ways to make the healthy choice the easy choice, even when life feels full.
Because energy isn’t something you chase. It’s something you create. One meal, one habit, one glass of water.
One small decision at a time.