Metabolic health sits at the heart of almost every chronic condition I see in clinic — from persistent fatigue and weight that won't shift, to hormonal chaos and brain fog. Insulin resistance is frequently the thread running through all of them, yet it rarely shows up on a standard GP blood test until significant damage has already been done. Understanding what it is, how to spot it early, and how to reverse it naturally is one of the most important things you can do for your long-term health.
What Is Insulin and Why It Matters for Metabolic Health
Insulin is a key hormone responsible for regulating blood sugar levels by allowing glucose to enter cells for energy. When functioning properly, it supports stable energy, mood, and metabolic balance. Problems arise when this signalling system breaks down — and it can do so gradually, silently, and for years before it becomes visible on routine tests.
What Is Insulin Resistance?
Insulin resistance occurs when cells become less responsive to insulin signals, forcing the body to produce more and more insulin to get the same effect. Think of it as your cells becoming hard of hearing — insulin keeps shouting louder, but the message isn't getting through. Over time, this leads to chronically elevated insulin levels, which are themselves inflammatory and drive fat storage, hormonal disruption, and systemic damage.
- Increased visceral fat storage
- Hormonal imbalances such as oestrogen dominance
- Systemic and neural inflammation
Signs You Might Have Insulin Resistance
Because symptoms overlap with so many other conditions — thyroid dysfunction, perimenopause, anxiety — insulin resistance is routinely missed or managed symptomatically rather than addressed at source. Common signs to watch for include:
- Energy crashes after meals, especially carbohydrate-heavy ones
- Strong sugar or carbohydrate cravings, particularly in the afternoon
- Difficulty losing weight despite eating carefully
- Brain fog, poor concentration, and low mood
- Disrupted sleep and slow recovery
Why Insulin Resistance Often Goes Undetected
Insulin resistance can develop silently for up to 10–15 years before it appears on standard blood tests, all while quietly causing metabolic damage. A standard HbA1c alone is not enough — fasting insulin should be tested alongside it to give a true picture of how hard your body is working to manage blood sugar.
Key Blood Markers to Watch
- HbA1c Optimal: 29–33 mmol/mol
- Early Warning: 37–41 mmol/mol
- Pre-diabetic: 42–47 mmol/mol
- Diabetic: 48 mmol/mol and above
- C-Reactive Protein (CRP): optimal under 1
What Causes Insulin Resistance?
Multiple lifestyle and dietary factors contribute to insulin resistance, often working together to disrupt metabolic balance. Modern eating patterns — frequent snacking, ultra-processed foods, high stress and poor sleep — create the perfect storm for blood sugar dysregulation.
- High intake of refined carbohydrates and sugars
- Eating too frequently without metabolic rest
- Low fibre, protein, and healthy fat intake
- Poor food order during meals
- Chronic stress impacting cortisol and insulin
- Certain medications affecting metabolic pathways
How to Improve Insulin Sensitivity Naturally
The encouraging news is that insulin resistance is largely reversible with targeted nutrition and lifestyle changes. These evidence-based strategies work together to retrain your cells to respond properly to insulin — often within weeks.
- Practice strategic fasting to support fat metabolism and cellular repair
- Eat foods in order: fibre, protein, fats, then carbohydrates
- Pair carbohydrates with fibre, protein, or fats to reduce blood sugar spikes
- Incorporate movement before and after meals — even a 10-minute walk can reduce a post-meal glucose spike by up to 30%
Want help making sense of your blood results? Book a one-to-one consultation tailored to your health history.
Book Consultation →- Resistance training and cold exposure activate glucose transporters in muscle cells independently of insulin
Why Fibre Is Essential for Blood Sugar Balance
Fibre plays a critical role in slowing sugar absorption, improving gut health, and supporting immune and hormonal systems.
- Slows digestion and reduces glucose spikes
- Supports gut motility and prevents 'leaky gut'
- Feeds beneficial gut bacteria
- Supports 70% of the immune system
Understanding the Gut–Hormone Connection
The gut plays a central role in hormone production and regulation, influencing metabolism, mood, and cravings.
- Supports GLP-1 production for appetite and blood sugar control
- Regulates serotonin for sleep and recovery
- Supports dopamine for mood and cravings
- Aids detoxification pathways for hormones and liver health
The Power of Polyphenols for Metabolic Health
Polyphenols are plant compounds found in berries, green tea, olive oil, and dark chocolate that directly improve insulin sensitivity and support both gut and brain health.
- Increase GLP-1 production naturally
- Improve insulin sensitivity
- Feed beneficial gut bacteria
- Protect gut lining integrity
Creating the Ideal Internal Environment for Health
Optimal metabolic health depends on supporting three core systems within the body. Address all three together for lasting results rather than targeting blood sugar in isolation.
- Gut health and microbiome balance
- Liver detoxification and function
- Hormonal balance and regulation
If you suspect blood sugar dysregulation is contributing to how you feel day-to-day, a functional test that includes fasting insulin alongside HbA1c gives a far clearer picture than standard NHS panels alone. Insulin resistance responds remarkably well to the right support — and getting ahead of it now is one of the most powerful investments you can make in your future health.
