Women over 40 often feel tired all the time because several energy systems can be under pressure at once: changing hormones, poorer sleep, blood sugar swings, stress, under-fuelling, nutrient gaps and possible medical issues such as thyroid problems or anaemia. It is common, but it is not something you have to simply accept as “getting older”.
If you are a tired all the time woman over 40, the key is to stop looking for one magic answer and start looking at the pattern. Your energy is influenced by hormones, sleep, food, digestion, stress, movement and health markers, and small improvements in the right places can make a very real difference.
Why does tiredness often increase after 40?
Many women reach their 40s already carrying a heavy load. Work, family, caring responsibilities, busy households, ageing parents, poor sleep and years of putting everyone else first can all catch up. Then, just as life feels fullest, hormones begin to shift.
Perimenopause can start years before periods stop. During this time, oestrogen and progesterone can fluctuate unpredictably. These hormones do not just affect periods and hot flushes, they also interact with mood, sleep, temperature regulation, blood sugar control and how resilient you feel under stress. The NHS lists tiredness, sleep problems, mood changes and brain fog among common menopause and perimenopause symptoms.
That said, hormones are not always the whole story. I often see women blaming everything on menopause when there are also nutritional gaps, long gaps between meals, too much caffeine, low protein, digestive issues or unrelenting stress sitting underneath the fatigue.
If perimenopause feels like the main driver for you, you may also find it helpful to read more about why tiredness can feel so intense during perimenopause.
Could poor sleep be draining your energy?
It sounds obvious, but many women underestimate just how much disrupted sleep affects daytime energy. You may be “in bed” for seven or eight hours, but if you are waking at 3am, overheating, worrying, needing the loo or struggling to get back to sleep, your body is not getting the deep restoration it needs.
Poor sleep can make you more prone to cravings, irritability, brain fog and blood sugar swings the next day. It can also make exercise feel harder and reduce motivation to cook nourishing meals, which can create a frustrating cycle.
A few signs sleep may be a central part of your fatigue include:
- You wake feeling unrefreshed, even after a full night in bed.
- You rely on caffeine to function in the morning or afternoon.
- You feel wired at night but exhausted during the day.
- You wake regularly between 2am and 4am.
- Your cravings are strongest after a poor night’s sleep.
Nutrition can support sleep by helping to stabilise blood sugar, reduce evening digestive discomfort and provide nutrients involved in relaxation, such as magnesium. However, persistent insomnia, snoring, breathing pauses or severe daytime sleepiness should always be discussed with your GP.
For a closer look at night waking in midlife, especially the classic 3am pattern, I have written separately about menopause insomnia and why you wake at 3am.
Are blood sugar swings making you feel exhausted?
One of the most common patterns I see in women over 40 is not eating enough earlier in the day, then feeling ravenous, foggy and exhausted by late afternoon. Breakfast might be just toast, coffee or nothing at all. Lunch may be rushed. By 4pm, the body is asking loudly for quick energy.
This is not a lack of willpower. It is physiology.
When meals are low in protein, low in fibre or heavily based on refined carbohydrates, blood glucose can rise and then dip. That dip can feel like sudden tiredness, shakiness, irritability, anxiety, cravings or needing something sweet “just to keep going”.
A steadier energy plate usually includes:
- A source of protein, such as eggs, fish, chicken, tofu, lentils, Greek yoghurt or beans.
- Fibre-rich carbohydrates, such as oats, potatoes with skins, brown rice, quinoa, beans, fruit or vegetables.
- Healthy fats, such as olive oil, avocado, nuts, seeds or oily fish.
- Colourful plant foods, which provide vitamins, minerals and protective compounds.
You do not need to be perfect. Even changing breakfast can be powerful. For example, swapping toast and jam for eggs with spinach and sourdough, or Greek yoghurt with berries, oats and seeds, may help you feel fuller and steadier through the morning.
Could you be under-fuelling without realising?
Many women in their 40s and 50s have spent decades dieting. It is easy to slip into “being good” during the day, eating light meals, avoiding carbohydrates and pushing through hunger. But if your body is under-fuelled, it may respond with low energy, cravings, poor sleep, low mood and difficulty recovering from exercise.
This is especially relevant if you are exercising more to manage weight but not eating enough to support that activity. Your body needs fuel to make energy. It also needs protein to maintain muscle, which becomes increasingly important as we age.
Muscle is not just about strength or appearance. It helps with blood sugar control, metabolic health and physical resilience. If your meals are too small, too low in protein or too restrictive, fatigue may be one of the first signs that your body is asking for more support.
A nourishing approach does not mean overeating. It means eating enough of the right foods, at the right times, for your body and your life.
What nutrient deficiencies can cause tiredness in women over 40?
Nutrient shortfalls are not the only cause of fatigue, but they are worth checking, particularly if tiredness is persistent, new or affecting daily life. Heavy periods during perimenopause can increase the risk of low iron, and women who eat little meat, follow a vegan diet or have digestive issues may be more vulnerable to low B12, iron or other nutrients.
The NHS notes that iron deficiency anaemia can cause tiredness, lack of energy, shortness of breath and noticeable heartbeats. An underactive thyroid can also cause fatigue, weight gain, low mood, dry skin and feeling cold, according to NHS information on hypothyroidism.
Here is a simple overview of common areas to consider:
| Possible factor | How it may show up | Sensible next step |
|---|---|---|
| Low iron or ferritin | Fatigue, breathlessness, heavy periods, dizziness, restless legs | Ask your GP about appropriate blood tests before supplementing |
| Low vitamin B12 | Tiredness, tingling, mouth ulcers, memory changes, low mood | Check levels, especially if vegan, vegetarian or using certain medications |
| Low vitamin D | Low mood, muscle aches, frequent infections, general fatigue | Consider testing and follow UK guidance on supplementation |
| Thyroid imbalance | Fatigue, weight changes, feeling cold, constipation, dry skin | Speak to your GP about thyroid function testing |
| Blood sugar imbalance | Afternoon crashes, cravings, shakiness, irritability | Build balanced meals and consider HbA1c testing if concerned |
Please do not start high-dose supplements without testing or professional guidance. More is not always better, and some nutrients can cause problems if taken unnecessarily or in the wrong form.
For a more nutrition-specific breakdown, you may find my guide to seven nutritional reasons for low energy useful.
Is stress making you tired even when you rest?
One of the most overlooked causes of tiredness is living in a constant state of pressure. You may not think of yourself as “stressed” because you are used to coping, but your body may still be receiving the message that it needs to stay on high alert.
When stress is ongoing, it can affect digestion, appetite, sleep, blood sugar regulation and food choices. Some women lose their appetite and run on coffee. Others crave sugar, bread, crisps or wine in the evening because their nervous system is looking for quick comfort and relief.
This does not mean stress is “all in your head”. It is a whole-body experience.
In nutrition practice, I often look at whether a woman’s food pattern is calming or amplifying the stress response. Skipping meals, drinking coffee on an empty stomach, eating very little during the day and then having wine at night can all make the body feel less safe and less steady.
Gentle changes can help. A protein-rich breakfast, regular meals, mineral-rich foods, hydration and reducing caffeine after lunch may all support a calmer energy pattern. So can non-food foundations such as daylight in the morning, walking, breathing space, boundaries and realistic rest.
Could gut health be part of the picture?
Your gut is closely linked with energy because it is where you digest food, absorb nutrients and interact with your immune system. If you regularly feel bloated, constipated, loose, uncomfortable after meals or restricted in what you can eat, it is worth exploring.
Poor digestion can make it harder to get the full benefit from your food. Gut symptoms can also disturb sleep, increase stress and lead to a narrower diet, which may reduce nutrient variety over time.
Supporting gut health does not always mean taking lots of supplements. Often, the basics matter most: chewing well, eating in a calmer state, gradually increasing fibre, including fermented foods if tolerated, drinking enough fluid and identifying foods that genuinely do or do not suit you.
If you have persistent digestive symptoms, unexplained weight loss, blood in your stool, ongoing diarrhoea, difficulty swallowing or a significant change in bowel habits, please speak to your GP promptly.
When should tiredness be checked by a doctor?
It is always sensible to seek medical advice if tiredness is severe, persistent, unexplained or getting worse. Nutrition can be incredibly supportive, but it should not replace appropriate medical assessment.
Consider booking a GP appointment if your fatigue is accompanied by symptoms such as chest pain, breathlessness, fainting, unexplained weight loss, heavy bleeding, persistent low mood, fever, night sweats, swollen glands or a major change in bowel habits. You should also seek help if you are struggling to function day to day.
Useful blood tests to discuss with your GP may include a full blood count, ferritin, B12, folate, thyroid function, vitamin D, HbA1c, liver and kidney function, inflammatory markers and any other tests appropriate to your symptoms and medical history.
A good nutrition plan works best when it sits alongside, not instead of, proper medical care.
What can you do this week to support better energy?
If you are feeling exhausted, the last thing you need is a complicated plan. Start small. Choose one or two changes and notice how your body responds.
You might begin with breakfast. Aim for 20 to 30 grams of protein if that suits you, plus fibre and colour. You might reduce caffeine after midday, add a proper lunch, drink more water, or stop leaving five or six hours between meals.
Here are a few gentle starting points:
- Eat breakfast within a couple of hours of waking if you currently run on coffee alone.
- Add protein to every meal, rather than saving it mainly for dinner.
- Build lunch around real food, not just a snack or a handful of crackers.
- Include iron-rich foods such as meat, fish, eggs, lentils, beans, tofu, pumpkin seeds and leafy greens.
- Pair carbohydrates with protein or healthy fat to reduce energy dips.
- Create a calming evening routine that does not rely on wine or scrolling to switch off.
You do not have to overhaul everything at once. In fact, most women do better when changes feel realistic, flexible and suited to their life.
Why personalised support can make such a difference
Fatigue can be frustrating because the cause is rarely obvious. Two women may both feel exhausted, but one may need help with blood sugar balance, another may need support through perimenopause, another may be under-eating, and another may need medical tests for iron or thyroid function.
That is why generic advice often falls short. A personalised nutrition approach looks at your symptoms, food habits, lifestyle, stress, sleep, digestion, preferences and health history together. It helps identify the most likely drivers of your tiredness and turns them into practical steps you can actually follow.
The goal is not to give you a perfect diet. It is to help your body feel better supported, steadier and more resilient.
Frequently Asked Questions
Is it normal for women over 40 to feel tired all the time? It is common, but it should not be dismissed as normal. Hormonal changes, stress, sleep disruption and nutritional gaps can all contribute, but persistent tiredness is worth investigating.
Can perimenopause make you exhausted? Yes, perimenopause can affect sleep, mood, temperature regulation and blood sugar balance, all of which can contribute to fatigue. However, it is still important to consider other causes such as low iron, thyroid issues or under-fuelling.
What should I eat if I feel tired all the time? Start with balanced meals that include protein, fibre-rich carbohydrates, healthy fats and colourful plant foods. Regular meals, enough calories and fewer blood sugar spikes can often support steadier energy.
Should I take supplements for tiredness? Supplements can help if you have a confirmed deficiency or a clear need, but guessing is not ideal. It is best to test key markers such as iron, B12, vitamin D and thyroid function where appropriate, then choose supplements with professional guidance.
When should I worry about fatigue? Speak to your GP if fatigue is severe, persistent, unexplained or comes with symptoms such as breathlessness, chest pain, fainting, unexplained weight loss, heavy bleeding, fever, night sweats or a major change in bowel habits.
Ready to understand what your tiredness is trying to tell you?
If you are tired of pushing through and would like to explore how nutrition could support your energy, hormones, digestion and overall wellbeing, I would love to help.
At Tracey Warren Nutrition, I offer personalised nutrition support from my practice in Nantwich, Cheshire, as well as online consultations across the UK. We can talk through your symptoms, your lifestyle and what may be getting in the way of feeling like yourself again.
You are very welcome to book a free 15-minute discovery call and let’s have a friendly chat about what support might look like for you.
