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Fatigue, weight, and low energy after 40: Your questions answered

Tania Lewis, Naturopath, Rutherglen VIC
Tania Lewis is a naturopath based in Rutherglen, Victoria, with 15 years of clinical experience as a Registered Nurse. She works with women in perimenopause and post-menopause experiencing fatigue, weight changes, sleep disruption, and metabolic concerns that standard care hasn’t fully explained. She works within a food-first framework addressing gut health, endocrine function, and metabolic health as connected systems. She sees clients in Rutherglen and Yarrawonga, and via telehealth Australia-wide.

Table Of Contents
  1. When your body changes, but nothing seems to work the way it used to
  2. Something’s not right…
  3. Why is this happening?
  4. Can this actually be helped?
  5. What would this look like for me?
  6. Is this worth it?
  7. Consultations and pricing
  8. Still not sure where to start?
  9. References

When your body changes, but nothing seems to work the way it used to

You might be eating well, exercising regularly, and doing all the things that used to work. But your energy is lower. Your weight is shifting. Your sleep isn’t as restorative. And something just feels off.

This is one of the most common patterns I see in women’s health after 40. Not because you’re doing anything wrong, but because your physiology has changed, and your body now needs a different kind of support.

Below are the questions I’m asked most often in clinic. If you’d rather talk it through first, a complimentary 10-minute Clarity Call is a good place to start.

Something’s not right…

These are usually the first signs something has shifted, even if everything looks normal on paper.

Why do I feel so tired all the time after 40, even when I sleep well?

Feeling tired after 40 despite adequate sleep is often about sleep quality, hormonal regulation, and blood sugar stability, not the number of hours slept. Fluctuating oestrogen and progesterone, ongoing stress, and overnight blood sugar dips all affect how deeply you sleep and how well you recover.

In clinic, I often see women sleeping enough hours but still waking unrefreshed. It’s usually not about sleep quantity. It’s about how well the body is regulating overnight.

Even in people without diabetes, greater blood sugar variability is associated with poorer sleep, including taking longer to fall asleep, which shows how closely glucose regulation ties to rest and recovery (Inaishi et al., 2023).

A helpful starting point is supporting stable blood sugar and a consistent wind-down routine before bed. For more on this pattern, see fatigue, weight gain, and low energy after menopause.

Could low energy and weight gain be a sign of perimenopause?

Yes. Low energy and weight gain are common early signs of perimenopause, driven by hormonal changes that affect metabolism and energy regulation. Fluctuations in oestrogen and progesterone influence blood sugar stability, fat storage, and how efficiently your body produces and uses energy.

Around 80% of women experience symptoms during the menopause transition (RANZCOG, 2023), and common symptoms include sleep disturbance, fatigue, and changes in body composition (Australasian Menopause Society, 2023).

Many women come in thinking they’ve suddenly lost control of their body. In reality, your physiology has shifted, and it needs a different strategy. If this feels familiar, it’s worth stepping back and looking at the broader pattern, not just calories or exercise.

Why do I get an afternoon energy crash, even when I eat regularly?

An afternoon energy crash is usually caused by blood sugar fluctuations, not how often you eat. Meals higher in refined carbohydrates or lower in protein spike your energy, then drop it a few hours later. The 2 to 4pm crash is one of the most consistent patterns I see, and it’s often set up by how the day starts nutritionally.

When blood sugar rises and falls sharply, energy, concentration, and fatigue follow the same pattern through the day. Greater glucose variability is linked to poorer energy and sleep even in people without diabetes (Inaishi et al., 2023). Maintaining stable blood sugar is key to preventing those dips.

Starting your day with a protein-rich breakfast can make a noticeable difference.

Why is this happening?

These symptoms are rarely isolated. They tend to reflect how several body systems are working together, or not.

Why does stress make it harder to lose weight after 40?

Stress raises cortisol, which promotes fat storage, affects insulin sensitivity, and makes weight loss harder, especially in midlife. When stress is ongoing, the body shifts into a protective, energy-conserving state.
I often explain this as a safety response. When the body perceives stress, it becomes much less willing to let go of energy stores.

Chronic stress activates the HPA axis and raises glucocorticoids like cortisol, which drive hyperglycaemia and insulin resistance over time. This is a recognised pathway linking ongoing stress to disrupted metabolic regulation (Sunena & Mishra, 2022).

Addressing the HPA axis, the system that governs your stress response, is often a turning point in weight resistance.

How does blood sugar affect energy, sleep, and weight in midlife women?

Blood sugar stability directly affects your energy, sleep quality, and weight regulation. When levels rise and fall quickly, the result is fatigue, cravings, disrupted sleep, and weight gain over time. In midlife, blood sugar becomes less forgiving. Small imbalances that didn’t matter before start showing up as real symptoms.

Insulin resistance often develops well before blood glucose or HbA1c move outside the normal range, because the body raises insulin to keep glucose in check. That’s why standard glucose testing can look reassuring while early metabolic changes are already under way, and why fasting insulin is worth looking at alongside glucose.

Balancing meals with protein, healthy fats, and fibre is one of the most effective starting points.

Can digestive issues cause weight gain or make it harder to lose weight?

Yes, particularly when gut function is affecting inflammation, nutrient absorption, or metabolism. When digestion isn’t working well, your body’s ability to regulate energy and weight is affected.

The gut microbiota helps regulate body weight by influencing how food is digested and absorbed, along with metabolism, appetite, and hormonal signalling. This is why gut function is closely tied to energy balance (Van Hul & Cani, 2023).

I often see weight resistance where gut function is still under strain, even when diet and exercise are consistent. Supporting digestion is frequently the missing piece.

What does it mean if my blood tests are normal but I still feel off?

Normal blood tests don’t always mean optimal health. Reference ranges reflect population averages, not your individual function, so early imbalances can sit inside the normal range and still produce symptoms.

In clinic, I often see results that are technically normal but don’t match how the person feels. That’s where pattern-based interpretation matters.

Reference ranges are population-based, so clinically significant changes can occur while your results still sit inside the normal range, which is why results are best read alongside symptoms rather than in isolation (Australian Prescriber, 2009). If you still feel off, it’s worth looking beyond individual markers to the broader pattern. This is what functional blood test interpretation is designed to do.

Can this actually be helped?

Once the pattern is clearer, the next question is whether it can be shifted.

Can a naturopath help with fatigue, weight gain, and gut issues?

Yes, particularly when these symptoms are connected. Rather than treating each issue separately, naturopathic care looks at how your body systems are interacting and what’s driving the pattern.

Symptoms rarely exist in isolation. When we support the underlying drivers, improvements often show up across several areas at once. The key is understanding the pattern before applying solutions.

Naturopathic care uses a whole-person, systems-based approach, which supports more personalised, targeted treatment (National Institute of Complementary Medicine, 2023). You can read more about my approach here.

How is a naturopathic approach different from what my GP has already checked?

Your GP plays an essential role in ruling out and managing disease. A naturopathic approach looks at how your body systems are functioning together, especially when symptoms persist without a clear diagnosis. The two roles are complementary.

Most clients I see have already had tests. My role is to connect those results with your symptoms to understand the underlying pattern.

Integrative approaches that consider whole-person health and system interactions are supported by the World Health Organization (2023), and this kind of care complements conventional medicine rather than replacing it.

What would this look like for me?

If you’re considering support, it helps to know what the process actually involves.

What happens in an initial naturopathic consultation at Simply Naturopathics?

Your initial consultation is a structured, in-depth assessment of your symptoms, history, and underlying patterns. I look at your energy, sleep, digestion, weight changes, and lifestyle, alongside any available blood tests, to build a clear picture of what’s driving your symptoms.

My goal in that first session is to help you feel understood and to start mapping out why things have changed, not just what to do next. You’ll leave with clarity and a clear next step.

Care that’s tailored to you, rather than to an average, is what makes the difference here. When your history and symptoms are understood as a whole, the plan that follows fits your body, not a template.

Do I need functional testing, or can you work with my existing blood tests?

In many cases, we can start with your existing blood tests. Functional testing is used when we need deeper insight, but your current results often already contain valuable information when they’re interpreted in context.

I regularly work with existing results. It’s often about how we interpret them, not how many tests we run.

Pathology results are best interpreted within the context of the individual, not in isolation (Australian Prescriber, 2009), which aligns with a functional approach where patterns and trends matter more than single markers. If further testing is needed, I recommend it thoughtfully and with a clear purpose.

Is this worth it?

This is usually where the final hesitation sits.

How long does it take to see results with a structured naturopathic plan?

Most people notice early shifts within the first few weeks, but meaningful, lasting change builds gradually and depends on how long the underlying pattern has been present. Early improvements often show up in energy, digestion, or sleep. These are signs the body is starting to respond.

I describe the first phase as recalibration. The deeper, more sustainable changes build from there, especially if symptoms have been developing for years.

Structured lifestyle interventions combining exercise and dietary change can produce measurable improvements in insulin sensitivity, glycaemic control, and lipid profiles, with clear gains seen over a supervised programme (Hafeez et al., 2025). Longer-standing concerns involving metabolism, hormones, or chronic stress often take longer to stabilise and need ongoing support.

Focus on consistency rather than perfection. That’s what drives lasting change.

Consultations and pricing

Initial Clinical Assessment — $220 (60-75 minutes)

A structured, in-depth assessment of your symptoms, history, and pathology. You leave with clarity and a written plan.

Follow-up Consultation — $150 (30-45 minutes)

A structured review of your progress, with your plan refined as your body responds.

Clarity Call — complimentary (10 minutes)

A short phone call to see whether this is the right fit. No clinical advice is given.

Still not sure where to start?

If you’re recognising yourself in these patterns, the next step isn’t doing more of the same. It’s understanding what’s actually driving the change in your body and having a clear plan to support it.

Book an Initial Clinical Assessment

Have more questions about how naturopathic care works? Read more on the Work with Tania page or explore the conditions I work with.

References

Inaishi, J., Kashiwagi, K., Kinoshita, S., Wada, Y., Hanashiro, S., Shiga, K., Kitazawa, M., Tsutsumi, S., Yamakawa, H., & Kishimoto, T. (2023). Associations between glycemic variability, sleep quality, and daily steps in subjects without diabetes using wearable devices. Metabolism Open, 20, 100263.  https://doi.org/10.1016/j.metop.2023.100263

Sunena, & Mishra, D. N. (2022). Stress etiology of type 2 diabetes. Current Diabetes Reviews, 18(9), e240222201413. https://doi.org/10.2174/1573399818666220224140934

Van Hul, M., & Cani, P. D. (2023). The gut microbiota in obesity and weight management: microbes as friends or foe? Nature Reviews Endocrinology, 19(5), 258-271. https://doi.org/10.1038/s41574-022-00794-0

Hafeez, S., Rehman, S. S. U., Riaz, S., Hafeez, I., Hafeez, Z., & Mumtaz, H. (2025). Impact of exercise manual program on biochemical markers in sedentary prediabetic patients: a randomized controlled trial. Medicina, 61(2), 190. https://doi.org/10.3390/medicina61020190

Royal Australian and New Zealand College of Obstetricians and Gynaecologists. (2023). Managing menopausal symptoms (C-Gyn 9). RANZCOG. https://ranzcog.edu.au/wp-content/uploads/Managing-Menopausal-Symptoms.pdf

Australasian Menopause Society. (2023). What is menopause? [Information sheet]. AMS. https://www.menopause.org.au/hp/information-sheets/what-is-menopause

Australian Prescriber. (2009). Pitfalls in interpreting laboratory results. Australian Prescriber, 32(1), 16-19. https://australianprescriber.tg.org.au/articles/pitfalls-in-interpreting-laboratory-results.html

National Institute of Complementary Medicine (NICM Health Research Institute), Western Sydney University. Position on whole-person, systems-based complementary and integrative healthcare. https://www.westernsydney.edu.au/nicm

World Health Organization. (2023). Traditional, complementary and integrative medicine. WHO. https://www.who.int/health-topics/traditional-complementary-and-integrative-medicine

This page is for educational purposes and does not constitute personalised health advice. Speak with a qualified practitioner before making changes to your health routine.