Explore the lifestyle, nutrition, and sleep factors that can affect daily energy.
8 Common Reasons Women Experience Fatigue After 35
"I slept eight hours last night... so why do I still feel exhausted?" Eliza 35, New York.
If you've ever looked at your third cup of coffee before 10 a.m. and wondered why your energy has disappeared, you're definitely not alone.
Fatigue is one of the most common reasons women seek medical advice after 35. And while it's tempting to blame "getting older," the truth is usually more complex.
Energy isn't controlled by one thing.
It's influenced by sleep, nutrition, stress, hormones, movement, recovery, mental health, and even your daily routines.
The encouraging news?
Many of these factors are modifiable.
Let's explore eight of the most common reasons your energy may not feel like it used to—and what you can do to support it.
1. You're Sleeping... But You're Not Recovering
Sleep and recovery are not exactly the same thing.
You might spend eight hours in bed but still wake up feeling like you barely slept.
Why?
Quality matters just as much as quantity.
Interrupted sleep, stress, alcohol, screen time before bed, or inconsistent sleep schedules can all affect how restorative your sleep is.
Ask yourself:
- Do I wake up during the night?
- Do I feel refreshed when I wake up?
- Am I relying on caffeine immediately after getting out of bed?
If the answer is "not really," your sleep quality may deserve more attention than your sleep duration.
Try this
- Keep a consistent bedtime—even on weekends.
- Dim lights an hour before bed.
- Keep your bedroom cool and dark.
- Put your phone down before your head hits the pillow (yes, we know it's hard).
2. Your Hormones Are Beginning to Shift
Hormonal changes don't suddenly appear on your 50th birthday.
For many women, subtle changes begin years earlier during perimenopause.
Fluctuations in estrogen and progesterone can influence:
- Sleep
- Mood
- Energy
- Recovery
- Body temperature
- Mental clarity
Some women notice only small changes.
Others feel like someone quietly swapped out their batteries overnight.
If you've noticed new fatigue alongside changes in your menstrual cycle, sleep, or mood, it's worth discussing with your healthcare provider.
3. You're Constantly Stressed (Even If You Don't Feel "Stressed")
Stress isn't always obvious.
Sometimes it looks like:
- Busy calendars
- Caring for children
- Aging parents
- Work deadlines
- Decision fatigue
- Mental load
Your body doesn't distinguish between emotional stress and physical stress.
Both require energy.
When life stays in "go mode" for weeks or months, feeling drained isn't a personal failure—it's a signal that recovery may need more space in your routine.
Small habit, big difference
Even a 20-minute walk, five minutes of deep breathing, or stepping outside for fresh air can help create moments of recovery during a busy day.
4. You're Not Eating Enough Protein
Many women are surprised to learn that they're simply not eating enough protein.
Protein supports:
- Muscle maintenance
- Recovery
- Satiety
- Healthy aging
It also helps you feel more satisfied after meals.
If breakfast is just coffee and toast, you might be setting yourself up for an afternoon energy crash.
Instead, aim to include a source of protein with each meal.
Examples:
- Greek yogurt
- Eggs
- Cottage cheese
- Tofu
- Chicken
- Fish
- Beans
- Lentils
You don't need perfection.
Just consistency.
5. You're Running on Coffee Instead of Fuel
Coffee isn't the villain.
Many of us genuinely enjoy it.
The problem starts when coffee becomes breakfast.
Caffeine can temporarily increase alertness, but it doesn't replace nutrients, hydration, or adequate sleep.
If your morning routine is:
Coffee → Coffee → Coffee
...your body might simply be asking for actual fuel.
Try pairing your coffee with a protein-rich breakfast and a glass of water.
Your future self will thank you around 3 p.m.
6. You're Moving Less Than You Think
This one feels backwards.
When you're tired, exercise sounds like the last thing you want to do.
Ironically, regular physical activity is associated with better energy over time.
That doesn't mean you need bootcamp workouts.
Walking.
Pilates.
Strength training.
Cycling.
Yoga.
The goal isn't exhaustion.
It's movement.
Even 20–30 minutes of moderate activity most days can make a meaningful difference.
7. You Could Be Missing Key Nutrients
Sometimes fatigue has a nutritional component.
Low iron stores, inadequate vitamin B12, vitamin D deficiency, or insufficient overall calorie intake are just a few examples.
It's important not to self-diagnose.
Persistent fatigue deserves a conversation with your healthcare provider, who can determine whether blood tests or other evaluations are appropriate.
Supplements can be helpful when a deficiency has been identified or dietary intake is insufficient, but they're not a substitute for understanding the underlying cause.
8. You're Expecting Yourself to Function Like You Did at 25
This one might be the most important.
Your life at 38 probably looks very different than it did at 25.
More responsibilities.
More decisions.
More people depending on you.
Your energy isn't only physical.
It's emotional.
Mental.
Social.
Instead of asking:
"Why can't I keep up?"
Try asking:
"What support does my body need today?"
That's a much kinder—and often more productive—question.
When Fatigue Is Worth Discussing With a Doctor
Feeling tired after a busy week is common.
Feeling exhausted all the time isn't something you should simply ignore.
Consider speaking with your healthcare provider if your fatigue:
- Persists for several weeks despite adequate rest
- Interferes with work or daily activities
- Is accompanied by unexplained weight changes, shortness of breath, chest pain, dizziness, or fainting
- Occurs alongside heavy menstrual bleeding, significant mood changes, or other new symptoms
There are many possible causes of fatigue, and getting the right evaluation is an important first step.
Small Changes That Can Support Your Energy
You don't need to redesign your life overnight.
Start with one habit.
Maybe it's:
✓ Eating a protein-rich breakfast.
✓ Going to bed 30 minutes earlier.
✓ Walking after dinner.
✓ Drinking more water.
✓ Strength training twice a week.
✓ Taking short breaks throughout your workday.
Tiny improvements have a way of adding up.
The Aurelia Perspective
We don't believe energy comes from pushing harder.
We believe it comes from supporting your body consistently.
Feeling energized isn't about chasing endless productivity.
It's about waking up with enough vitality to enjoy your day, care for the people you love, and feel like yourself again.
Because after 35, wellness isn't about doing more.
It's about doing what matters most—and giving your body the support it deserves.
Scientific References
- American Academy of Sleep Medicine. Recommendations on healthy sleep duration and sleep quality in adults.
- North American Menopause Society. Guidance on perimenopause, menopause, and symptoms including fatigue and sleep changes.
- American College of Obstetricians and Gynecologists. Resources on women's health, perimenopause, abnormal uterine bleeding, and healthy aging.
- World Health Organization. Physical activity guidelines for adults and recommendations supporting overall health and energy.
- Academy of Nutrition and Dietetics. Position papers on balanced nutrition, protein intake, and healthy eating patterns.
- Puetz TW, Flowers SS, O'Connor PJ. A randomized controlled trial of the effect of aerobic exercise training on feelings of energy and fatigue in sedentary young adults with persistent fatigue. Psychotherapy and Psychosomatics. 2008;77(3):167–174. This study found that regular moderate aerobic exercise improved perceived energy and reduced fatigue in participants.
- Pontzer H, et al. Daily energy expenditure through the human life course. Science. 2021;373(6556):808–812. This research showed that total energy expenditure remains relatively stable across much of adulthood after accounting for body size and composition, suggesting that lifestyle and physiological factors—not simply age—often explain changes in how energetic we feel.
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press. A foundational reference on protein and nutrient requirements across the lifespan.
Medical note: This article is intended for educational purposes only and should not replace individualized medical advice. If you're experiencing persistent or unexplained fatigue, consult a qualified healthcare professional for a comprehensive evaluation. Fatigue can have many causes, including medical conditions that require diagnosis and treatment.