Insulin Resistance Isn’t What You Think It Is

You’ve cut the carbs. You’re intermittent fasting. Maybe you’re taking berberine or niacin because you read they help with insulin sensitivity. Your doctor says your blood sugar is “normal,” but you feel worse every year—exhausted, stuck, gaining weight around your middle despite doing everything that should work.

This is one of the most common conversations I have in clinic. Someone sits down, opens their pathology results, and says, “My doctor says everything looks fine… but I feel anything but fine.”

Here’s what almost no one tells you: insulin resistance isn’t a blood sugar problem. It’s a signalling problem. And more importantly, it’s often a protective response your body is using because the current metabolic environment isn’t working.

When you understand this, the whole picture shifts—not because there’s a magic supplement or perfect diet waiting for you, but because you stop fighting your physiology and start supporting it.

Why “Normal” Labs Don’t Tell the Full Story

What surprised me early on was how often insulin resistance showed up years before glucose moved at all.

I’ll see someone whose fasting glucose sits at 4.8 mmol/L, whose HbA1c is “in range,” but whose fasting insulin is already elevated—sometimes in the high teens or low twenties (which would be 125-150 pmol/L in Australian lab units) when it should be under 10 mIU/L (or under 70 pmol/L).

Their GP has told them everything is fine. But they’re experiencing:

• Energy crashes in the afternoon
• Difficulty losing weight, especially around the abdomen
• Brain fog or irritability between meals
• A family history of type 2 diabetes creeping closer every year

This is insulin resistance hiding in plain sight. The body is producing more and more insulin to keep glucose normal, but the cells aren’t responding the way they should. Eventually, glucose rises too—but often years after insulin has been screaming for attention.

In Australia, standard pathology often doesn’t include fasting insulin unless specifically requested—which means this pattern goes undetected until glucose finally rises and a prediabetes or type 2 diabetes diagnosis appears seemingly “out of nowhere.”

By then, the terrain has been deteriorating for a long time.

Insulin Resistance as Signal, Not Sabotage

Here’s the reframing that changes everything:

Insulin resistance is not your body betraying you. It’s your body trying to protect you from excess fuel it doesn’t know how to handle right now.

When the body is under chronic stress—whether from overnutrition, inflammation, cortisol dysregulation, or metabolic overload—it reduces insulin sensitivity to protect tissues from excess glucose uptake. It’s a brake, not a failure.

I’ve seen this shift change how people approach their health entirely. When you stop seeing insulin resistance as something to override and start seeing it as a message about your metabolic environment, the question shifts from “What supplement can fix this?” to “What is my body responding to?”

And that’s usually when real progress starts.

Why Two People Get Different Results

This is where the concept of “metabolic terrain” becomes unavoidable in practice.

Two people can follow the same low-carb diet, take the same supplements, and get completely different results. One person’s fasting insulin drops into single digits within weeks. The other feels worse—more tired, more anxious, more stuck.

In my experience, terrain is not a metaphor. It’s a measurable biochemical state defined by:

• Insulin signalling pressure (chronic hyperinsulinemia vs stable insulin)
• Cortisol rhythm (are you running on adrenaline?)
• Nutrient sufficiency (especially magnesium, vitamin C, vitamin D)
• Mitochondrial capacity (can your cells actually use the fuel they’re getting?)
• Muscle mass (the primary sink for glucose)

Niacin, berberine, fasting, or carbohydrate restriction don’t work in a vacuum. Their effects depend entirely on the underlying terrain they’re being applied to.

When terrain is stable, interventions like niacin can support NAD+ metabolism, improve lipid handling, and enhance insulin sensitivity. When terrain is fragile, the same interventions often expose weakness instead of fixing it.

How to Assess Your Own Terrain (Without Expensive Testing)

You don’t need advanced labs to get a sense of whether your terrain is ready for metabolic interventions. Pattern recognition is often enough.

If you’re reading this and quietly thinking, “That sounds like me,” pause there. That recognition matters more than any supplement decision.

Ask yourself:

• Do you feel worse, not better, when you skip meals?
• Do you get shaky, anxious, or irritable if meals are delayed?
• Did low-carb initially help, then stall or backfire?
• Do you rely on caffeine to function?
• Is weight loss hardest around the abdomen?
• Do you wake feeling wired but exhausted?
• Does intense exercise leave you drained for days?

If you’re answering yes to several of these, your body is likely signalling that restriction is not the solution right now. Adding more fasting, cutting more carbs, or layering in stimulating supplements often makes things worse.

This is the pattern most people miss: if restriction worsens symptoms, terrain is not ready for aggressive interventions.

The Cortisol Connection Most People Overlook

One of the most under-recognised drivers of insulin resistance is cortisol dysregulation—and it’s something I look for in almost every case.

Cortisol and insulin work together to manage energy. When cortisol rhythm is disrupted—often from chronic stress, poor sleep, under-eating, or over-exercising—insulin must work harder to stabilise blood sugar. Over time, this drives insulin resistance even if diet is “perfect.”

Patients often say things like:

• “I’m tired but can’t switch off.”
• “I crash mid-afternoon.”
• “I’m exhausted at night but wired in bed.”
• “I gain weight even when eating less.”

These aren’t motivation problems. They’re signalling problems.

This is where the concept of the Insulin-Cortisol-Vitamin C (ICV) axis becomes relevant. Under chronic stress, demand for all three rises together. Vitamin C is burned through rapidly during cortisol production, magnesium is depleted, and insulin remains elevated to manage the glucose released by stress hormones.

Treating insulin resistance without addressing cortisol is like trying to bail out a boat while the tap is still running.

A Framework That Emerged From Practice

Over time, this became the framework that shaped how I work with insulin resistance. Not because I wanted a named method, but because the same patterns kept repeating—and the same sequence kept working.

I call it The ROOT Method™, and it stands for:

• Reveal the underlying causes
• Optimise what’s imbalanced
• Organise deficiencies and rebuild
• Transform and sustain long-term wellness

It’s not a rigid protocol. It’s a map for working with your body’s signals rather than against them.

Phase 1: REVEAL – Understanding What’s Actually Driving This

Before treating insulin resistance, we need to understand why it developed in the first place.

In practice, this tends to show up through functional testing that reveals:

• Elevated fasting insulin alongside “normal” glucose
• Cortisol dysregulation (flat rhythm, reversed timing)
• Nutrient deficiencies (magnesium, zinc, vitamin D)
• Gut dysfunction affecting nutrient absorption
• Inflammatory markers indicating tissue stress

But you don’t always need expensive testing to begin. Sometimes the story your body is telling through symptoms is enough to start making better decisions.

Phase 2: OPTIMISE – Correcting Core Imbalances

Once we understand your terrain, we address the specific imbalances driving insulin resistance.

This often includes:

Gut health restoration
Insulin resistance often coexists with intestinal permeability (“leaky gut”), bacterial imbalance, malabsorption, or SIBO. When the gut is compromised, even the best diet and supplements can’t work properly.

Addressing inflammation
Chronic inflammation interferes with insulin signalling at the cellular level. This phase focuses on identifying and removing inflammatory triggers while supporting the body’s natural anti-inflammatory systems.

Supporting detoxification
When the liver and detox pathways are overwhelmed, metabolic signalling suffers. This isn’t about juice cleanses—it’s about ensuring your body can process and eliminate what it needs to.

Phase 3: ORGANISE & REBUILD – What Actually Works in Practice

This is where the practical work happens—stabilising your metabolic terrain through structured nutrition and targeted supplementation.

When I see fasting insulin drop from the high teens to single digits in 8-12 weeks, it’s rarely about one supplement or one diet tweak. It’s about stabilising the terrain.

The Pattern That Works Most Consistently

Meal structure over restriction

What I usually see is that people improve when they:

• Eat three structured meals most days
• Anchor protein at every meal (not token amounts—real portions)
• Reduce snacking rather than adding more fasting
• Eat breakfast within 60-90 minutes of waking if cortisol is high
• Don’t rely on coffee to get through lunch
• Finish dinner early enough to allow a clear overnight fast

This alone often reduces reactive hypoglycaemia and cortisol-driven insulin output.

Protein targets that actually matter

More often than not, people improve when protein reaches roughly:

• ~25–35g per meal for women
• ~30–45g per meal for men

Not as a rule, but as a correction. Many people eating low-carb or fasting are eating far less protein than they realise. Low protein is one of the biggest hidden drivers of persistently high insulin.

Resistance training over more cardio

• 2–3 sessions per week
• Muscle acts as the primary sink for glucose
• Excessive cardio often worsens cortisol-driven insulin issues

Micronutrient correction

• Magnesium, vitamin C, vitamin D, zinc
• These aren’t optional—they’re structural to insulin signalling
• Many Australians are deficient in vitamin D (despite the sunshine myth) and magnesium, particularly those under chronic stress

Nervous system regulation

• Sleep consistency
• Stress reduction (not perfection, but stopping the adrenaline burn)
• Circadian alignment

This isn’t glamorous. It’s not a biohack. But it works because it addresses the reasons insulin resistance developed in the first place, rather than forcing glucose down through restriction.

The Niacin Question: Why It Helps Some People and Harms Others

This is where people often get confused—and sometimes scared.

Niacin is one of the most powerful metabolic vitamins available. It’s a precursor to NAD+, essential for energy production, DNA repair, and cellular signalling. Historically, it was one of the few interventions shown to reduce cardiovascular events.

But niacin also has a complicated relationship with insulin.

In certain metabolic contexts—particularly when someone is eating a high-carbohydrate diet, chronically hyperinsulinemic, or magnesium-deficient—niacin can worsen insulin resistance. It does this by suppressing lipolysis (fat breakdown) and triggering rebound free-fatty-acid release, which interferes with insulin signalling.

But this doesn’t mean niacin is bad. It means niacin amplifies the existing metabolic state.

If you’ve taken niacin and felt worse, that doesn’t mean you damaged anything or did something wrong. It usually means your system wasn’t ready for that signal yet.

When niacin is used within a stable terrain—a low-carbohydrate baseline, adequate protein, sufficient magnesium and vitamin C, and mitochondrial support—the insulin resistance risk is largely mitigated. In that context, niacin’s benefits (NAD+ repletion, improved lipids, better endothelial function) dominate.

When to Consider Niacin

Niacin tends to work well when:

• Meals are stable and structured
• Protein intake is adequate
• Sleep is improving
• Blood sugar symptoms are calmer
• You’re not running on caffeine and adrenaline

When to Wait

Hold off on niacin if:

• You’re under-eating or skipping meals
• Cortisol symptoms dominate (wired and tired, reactive blood sugar)
• Fatigue is severe
• Fasting or low-carb is making you feel worse

The most important question isn’t “Is niacin good or bad for insulin resistance?” It’s “Does my body feel more stable since starting this, or more stressed?”

If niacin increases fatigue, worsens sleep, or makes blood sugar feel more erratic, terrain isn’t ready. Supplements should reduce the load, not expose fragility.

Phase 4: TRANSFORM – Building Long-Term Resilience

The final phase is about building lasting metabolic flexibility and resilience—not just fixing insulin resistance temporarily, but creating a metabolic environment where it doesn’t develop in the first place.

This includes:

• Metabolic flexibility: Teaching your body to efficiently use different fuel sources
• Stress resilience: Strengthening your HPA axis and nervous system regulation
• Ongoing monitoring: Regular check-ins to track fasting insulin, not just glucose
• Education: Understanding your body’s signals so you can maintain wellness independently

The Real Takeaway

Insulin resistance is not a character flaw, a lack of willpower, or a single lab value.

It’s a message from your body that the current metabolic environment isn’t working. And when you change the environment—when you stabilise meals, correct deficiencies, build muscle, manage stress, and stop forcing interventions onto fragile terrain—the signal often changes too.

Some people need niacin. Some need niacinamide or NMN for gentler NAD+ support. Some need neither—they need to eat more, sleep better, and stop pushing metabolic interventions their body isn’t ready for.

The question isn’t “What should I take?” It’s “What does my body need to feel safe enough to respond?”

Most people don’t need more discipline. They need better information and less pressure. And once they stop forcing the wrong lever, the body often does far more than they expect.

---

What to Do Next

If you recognize these patterns in yourself:

Start here:

• Use the terrain questions above to assess whether restriction is helping or stressing your system
• Notice whether your current approach is making you feel more stable or more fragile
• If things are getting worse despite “doing everything right,” pause escalation

If you’re stuck:

• Consider testing that looks beyond glucose alone (fasting insulin, HOMA-IR, comprehensive metabolic and micronutrient panels)
• Many Australian GPs can order fasting insulin through standard pathology, though you may need to request it specifically
• Seek guidance from a practitioner who understands terrain, not just protocols—whether that’s an integrative GP, naturopath, or nutritionist with metabolic expertise

Ready for a comprehensive approach?

The ROOT Method™ at Vital Health and Natural Medicine offers a complete pathway from revealing the underlying causes of your insulin resistance through to long-term transformation.

Book a free discovery call to discuss your health concerns and learn how The ROOT Method™ can help you address insulin resistance at its source.

The win isn’t perfection. The win is discernment.

When you stop forcing the wrong lever and start building capacity instead, insulin resistance often becomes less of a life sentence and more of a signal you finally know how to read.