What Is Insulin Resistance? Signs, Causes and How to Reverse It

If you've ever felt utterly exhausted after a sandwich, gained weight around your middle for no obvious reason, found yourself ravenous two hours after eating, or watched your GP frown at your fasting glucose results there's a fair chance insulin resistance is part of the picture. It's becoming so common in Australia that it's now estimated to affect around one in three adults to some degree, though most don't know they have it.

Here's what it actually is, why it matters, and what you can do about it. Without scaremongering, but without sugar-coating either, because this one matters.

What insulin is supposed to do

Every time you eat carbohydrate, your blood sugar rises. Your pancreas releases insulin, a hormone whose job is to escort that sugar out of your bloodstream and into your cells, where it's used for energy or stored for later.

In a healthy person, this works beautifully. A small amount of insulin opens the door, the sugar moves into the cell, blood sugar comes back down, insulin levels drop. The whole thing happens quietly in the background, dozens of times a day.

What goes wrong

Insulin resistance is what happens when your cells stop responding properly to insulin's signal. The doors that used to open easily now require more knocking. So your pancreas releases more insulin. That works for a while until the cells get even more resistant, requiring even more insulin, and so on.

You end up in a state where your blood sugar might look "normal" on a basic test, but your insulin levels are chronically elevated. Your body is working much harder behind the scenes to keep things stable, and that hidden effort has consequences.

Eventually, even the extra insulin can't keep up. Blood sugar starts to rise. That's when you cross from "insulin resistant" into pre-diabetes, and then type 2 diabetes. But the years, sometimes decades before you get there are when most of the damage to your energy, weight and metabolism is being done.

The signs most people miss with Insulin Resistance

This is the bit that frustrates me. Insulin resistance gets diagnosed late because the early signs look like normal life. Most people put them down to stress, age, or a busy schedule. They are:

Stubborn belly fat that won't shift no matter what you do. Insulin is a storage hormone. When it's chronically high, your body is in storage mode — and the storage of choice is visceral fat around the middle. If you've lost weight everywhere except your waist, this is the most likely reason.

Energy crashes after meals. Particularly after carb-heavy meals. The 3pm slump is often a symptom of an overshooting blood-sugar response.

Cravings, especially for sugar or refined carbs. Your cells aren't getting fuel efficiently, so your brain keeps demanding more.

Hunger soon after eating. A proper meal should hold you for four to five hours. If you're ravenous after two, your blood sugar is yo-yoing.

Skin tags or dark patches on the neck, armpits or groin. These are clinical signs of insulin resistance that GPs are trained to spot, but many don't know to look.

Brain fog and difficulty concentrating. Your brain is the most glucose-hungry organ in the body, and it's very sensitive to insulin signalling.

Irregular periods or hormonal symptoms. Insulin resistance is the underlying driver of polycystic ovary syndrome and contributes to menopause symptoms.

Rising blood pressure or cholesterol without obvious cause.

If three or more of these sound familiar, it's worth a proper conversation with your GP — including asking for fasting insulin, not just fasting glucose. Fasting glucose can look fine for years while fasting insulin is climbing.

What causes Insulin Resistance

Insulin resistance doesn't appear overnight. It's the slow result of a few patterns that have become entirely normal in modern life.

Chronically high carbohydrate and sugar intake. Particularly refined carbs and added sugars. Every spike trains your pancreas to release more insulin. Over years, your cells get tired of listening.

Constant snacking. Insulin rises every time you eat, even a small amount. Modern eating patterns — breakfast, snack, lunch, snack, dinner, snack, drink — mean your insulin is rarely allowed to come back down. You're effectively running an all-day insulin marathon.

Sleep deprivation. Even a few nights of poor sleep makes cells more insulin resistant. This is well documented.

Chronic stress. Cortisol raises blood sugar. Chronic cortisol means chronic blood-sugar elevation means chronic insulin elevation.

Sedentary lifestyle. Muscle is your biggest sugar-disposal organ. Less movement means less sugar getting cleared, means more insulin needed.

Visceral fat itself. It's a vicious circle - insulin resistance causes belly fat, and belly fat (which is metabolically active) worsens insulin resistance.

Genetics. Some people are more prone than others. If type 2 diabetes runs in your family, you're working uphill which makes the lifestyle factors even more important.

The good news: it's reversible

This is the bit I want you to hear most clearly. Unlike many chronic conditions, insulin resistance is genuinely reversible often within months if you address the lifestyle factors causing it. Not managed. Not slowed. Reversed.

Here's what actually works:

Eat protein and fibre at every meal. This is the single most powerful change. Protein and fibre flatten the blood-sugar response so insulin doesn't have to spike. A breakfast of eggs and avocado on rye is metabolically a completely different event from a bowl of cereal with milk and a banana.

Reduce refined carbohydrates and added sugars. Not zero, just less. White bread, soft drink, juice, biscuits, sweet breakfast cereals, pasta as the main event, these are the most predictable triggers. You can still enjoy real food, real desserts, real bread; just shift the everyday baseline.

Stop snacking. Three real meals a day, with nothing between them, lets your insulin come back down. This one change alone has been shown in research to improve insulin sensitivity dramatically within weeks.

Move after meals. A ten-minute walk after dinner lowers post-meal blood sugar more than almost any other single intervention. It uses up the glucose your cells are about to be flooded with, so insulin has less work to do.

Build muscle. Resistance training a few times a week increases your body's sugar-clearing capacity directly. Muscle is metabolic insurance.

Sleep seven-plus hours. Not optional. Sleep deprivation alone can make you insulin resistant within a week.

Manage stress. Easier said than done, I know but breathwork, walking outdoors, time off your phone, social connection. These aren't fluff. They're metabolic interventions.

Why I care about this for workplaces

A workforce running on refined-carb breakfasts and afternoon biscuit tins is a workforce drifting into insulin resistance, en masse, in slow motion. The energy crashes you see in your team at 3pm, the brain fog in long afternoon meetings, the creeping weight gain people quietly mention, the rising rates of pre-diabetes in routine corporate health checks - these aren't unrelated. They're the same metabolic story playing out in dozens of people at once.

This is the work I do with organisations through corporate wellbeing programs — giving teams the science and the doable changes that get insulin signalling back on track, without anyone having to overhaul their entire life. The payoff isn't just better health markers six months later; it's how people feel by Wednesday afternoon, week after week.

If anything in this article sounded uncomfortably familiar - the belly fat, the cravings, the 3pm crashes, the fog, please don't ignore it. Insulin resistance is one of the most fixable conditions in modern medicine, and the earlier you act, the easier it is to reverse. Talk to your GP. Look at what's on your plate. And start somewhere - anywhere - today.

Yours in good health and some dark chocolate. 🍫 Michele