The Metabolic Shift Most Women Don't Know Is Happening & £60 Metabolic MOT Offer

Many people reach a point where their energy becomes unreliable. The afternoon slump that didn’t used to happen. The sleep that no longer restores. The gradual gain in body weight. The brain fog! It feels like the body isn’t quite responding the way it once did, despite reasonable effort.

These changes are often put down to getting older, being busy, or not trying hard enough. In many cases, there is a physiological explanation.

May MOT offer below!

What Is Metabolic Flexibility — and Why Does It Matter?

In a state of optimum health our body is able to find its natural balance and operate efficiently to ensure survival by adapting to periods of stress and changes in our environment. This is known as homeostasis.

The body runs on two main fuel sources: glucose, derived from carbohydrates, and fat from its own stores. In good metabolic health, it moves between them naturally — using glucose in the hours after a meal, and drawing on fat reserves between meals and overnight.

This capacity to shift between fuels is called metabolic flexibility, and it is a reliable marker of how well the metabolism is functioning overall.

When this flexibility is diminished, the body struggles to make the transition. It remains dependent on glucose even when food hasn’t been eaten for several hours, which is why energy becomes erratic, concentration wavers, and cravings — particularly for carbohydrates — can feel difficult to manage.

Our mitochondria, in every cell of our body

The Two Mechanisms at the Heart of This

Metabolic flexibility depends on two things working well together.

The mitochondria are the structures within each cell responsible for producing energy. Their efficiency determines how consistently and reliably the body generates fuel. Mitochondrial function declines gradually with age, but it is also sensitive to a range of everyday factors — sleep, toxins, nutrients, stress all impact how well they produce energy for us.

Insulin sensitivity is the body’s ability to respond effectively to insulin and move glucose into the cells where it is needed. When sensitivity is good, the system runs cleanly. When it becomes blunted — either due to age, years of frequent or high carbohydrate intake or  — glucose is less well managed, our insulin response is desensitised and the metabolic switch from glucose to fat burning is delayed or suppressed.

The result is energy deficit throughout the body and this can affect our day to day energy and have consequences for longer term health.

Oestrogen

Oestrogen supports both mitochondrial efficiency and insulin sensitivity. During the reproductive years, this offers a degree of metabolic protection that is often not appreciated until it begins to change. As oestrogen declines through perimenopause and beyond, both systems can be affected simultaneously — and the impact is not confined to energy and weight.

Emerging research points to a meaningful connection between this loss of metabolic flexibility and the higher rates of cognitive decline and cardiovascular disease seen in women after menopause.

Impaired glucose metabolism in the brain, in particular, is increasingly understood as a factor in dementia risk. According to the Alzheimer's Society, women account for around two-thirds of people living with Alzheimer's disease in the UK. 

Key take-away: The tiredness, mental fog and body composition changes that many women experience in midlife reflect changes in energy metabolism that can increase chronic disease risk. Luckily this shift can be addressed with nutrition and lifestyle adjustments.

May MOT offer below!

Small changes make the difference

Restoring metabolic flexibility is not about dramatic change, but consistent, personalised adjustments.

Support the mitochondria:

•       Eat a nutrient-dense diet 

•       Protect your sleep 

•       Reduce toxic burdens 

•       Don’t starve your body, but don’t over-indulge it either 

Boost insulin sensitivity

•       Reduce your reliance on carbohydrates

•       Align your meals to your circadian rhythm

•       Exercise

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May MOT Offer

Ready to take a closer look at your own metabolic health?

During May, I'm offering a personalised diet review and 30-minute online consultation for only £60 - a focused starting point for understanding what might be affecting your energy, weight or mental clarity, and what to do about it.

Get in touch at eleanorreidnutrition.com, call 07775 725341 or click here.

Warm wishes, Eleanor

References

Ang et al., (2025) ‘Perspectives on Whole Body and Tissue-Specific Metabolic Flexibility and Implications in Cardiometabolic Diseases’.

Renke, G., Kemen, E., Scalabrin, P., Braz, C., Baesso, T., & Pereira, M. B. (2023). Cardio-Metabolic Health and HRT in Menopause: Novel Insights in Mitochondrial Biogenesis and RAAS.