Insulin Resistance in Women: Recognising and Reversing It

What is insulin resistance?

To understand insulin resistance, it helps to first know what insulin does. Insulin is a hormone produced by your pancreas every time you eat, particularly when you consume carbohydrates. It acts as a key that opens the doors of your cells, so that glucose (sugar) from your blood can enter the cells to be used as fuel. Without insulin, glucose would keep circulating in your blood and your cells would starve despite an abundance of fuel.

With insulin resistance, those keys and locks stop working properly. The locks on your cells become, as it were, rusted. The insulin key still fits, but the lock turns with increasing difficulty. Your pancreas responds by making more keys: more insulin. Initially this still works. Your blood sugar remains normal, but your insulin level is already elevated. This stage can last for years without you noticing, because your blood sugar looks perfectly fine on paper.

But those high insulin levels have a downside. Insulin is also a storage hormone. It signals your body to store fat, particularly around your belly. It inhibits fat burning. It makes you hungry and increases your desire for quick sugars. And it promotes inflammation in your body. The longer this process continues, the harder your pancreas has to work and the more serious the consequences become.

Eventually, if insulin resistance remains untreated for years, your pancreas can no longer keep up. Then your blood sugar does rise, and we speak of prediabetes or type 2 diabetes. But the important insight is that the problem begins much earlier — years before your blood sugar goes off track. And in that early stage, you can still fully reverse it.

Why women 40+ are particularly susceptible

Insulin resistance can affect anyone, but women from their 40s are at extra risk. This has everything to do with the profound hormonal shifts that occur during perimenopause and the menopause. Three factors play a leading role.

Declining oestrogen reduces your insulin sensitivity. Oestrogen normally protects your cells against insulin resistance. It helps your muscles take up glucose effectively and keeps your fat storage in balance. When your oestrogen level starts to fall and fluctuate during perimenopause, you lose that protection. Your cells become less sensitive to insulin, your body switches to storing fat around the belly and your blood sugar becomes less stable. This explains why many women in their 40s suddenly struggle with belly fat, even when nothing has changed about their eating habits.

Chronically elevated cortisol acts like fuel on the fire. Perimenopause makes you more susceptible to stress because the calming effect of progesterone decreases. At the same time, you're in a life stage with many balls in the air: work, family, caregiving, relationships. Chronically elevated cortisol has a direct effect on your blood sugar: it stimulates your liver to release extra glucose so that your muscles are ready to fight or flee. But because there is no actual acute threat, the glucose keeps circulating in your blood. Your pancreas responds with even more insulin and the wheel spins faster.

Loss of muscle mass reduces your metabolic capacity. From your 30s you gradually lose muscle mass — a process called sarcopenia. During perimenopause, this process accelerates due to declining hormone levels. And that is relevant, because your muscles are by far the largest consumers of glucose in your body. The less muscle mass you have, the less glucose you can process and the faster you slide towards insulin resistance. It's a vicious cycle: insulin resistance makes it harder to maintain muscle, and less muscle worsens insulin resistance.

Symptoms: recognise the signals

Insulin resistance develops insidiously. Your blood values may still look normal while your body has already been overworking for years. But your body does send signals. Below are the most common symptoms in women.

Persistent belly fat. This is one of the most characteristic signals. You gain weight around your waist, even when you watch what you eat. Specifically, it concerns visceral fat — the deep belly fat around your organs. A waist circumference above 80 centimetres in women is a risk factor. This fat is not just cosmetically bothersome; it is hormonally active and produces inflammatory substances that further worsen insulin resistance.

Energy dips after eating. Do you feel sleepy, sluggish or unfocused after lunch? Then your blood sugar has probably risen sharply and fallen again. With insulin resistance, your body cannot smoothly get glucose into your cells, causing your blood sugar to spike and then drop deeply. You feel those troughs as extreme fatigue, concentration problems and an irresistible craving for something sweet to perk yourself back up.

Sugar cravings and constant hunger. Insulin resistance disrupts your hunger and satiety hormones. Due to the high insulin levels, your cells don't receive enough glucose, so your brain thinks there's an energy shortage. The result: a persistent feeling of hunger, particularly a craving for fast carbohydrates and sugar. It's not a matter of willpower. Your body is literally sending the wrong hunger signals.

Brain fog and concentration problems. Your brain is the largest consumer of glucose in your body. When the glucose supply is irregular due to blood sugar fluctuations, you notice it directly in your cognition. Forgetfulness, difficulty concentrating, the feeling of looking through a fog — it can all be connected to insulin resistance.

Dark patches on the skin. A less well-known but telling sign is acanthosis nigricans: velvety, dark-coloured skin patches in the neck fold, armpits or groin. This is a direct result of chronically elevated insulin levels stimulating skin cells to grow faster. Not every woman with insulin resistance has this, but if you see it, it's a strong signal.

Other signals to watch for:

• Fatigue that doesn't improve with more sleep
• Mood swings and irritability
• Elevated blood pressure
• Difficulty losing weight despite calorie restriction
• More frequent urination
• More thirst than usual
• Irregular periods or worsened PMS symptoms

Do you recognise three or more of the above symptoms? Then it's wise to speak with your GP and have the right blood values tested.

Diagnosis: which blood values to test?

The frustrating thing about insulin resistance is that a standard blood sugar test at the GP often doesn't pick it up. Fasting glucose and even HbA1c can still be normal while your body has been overcompensating with high insulin levels for years. That's why it's important to specifically ask for the right tests.

Fasting glucose. This is the basic test that most GPs request. A value below 5.6 mmol/L is considered normal. Between 5.6 and 6.9 we speak of prediabetes, above 7.0 of diabetes. But note: this test only shows abnormalities once your pancreas can no longer keep up. It's like a smoke alarm that only goes off when the house is already on fire.

HbA1c (glycated haemoglobin). This test shows your average blood sugar over the past two to three months. A value below 37 mmol/mol is normal, between 38 and 47 is prediabetes, above 48 is diabetes. HbA1c gives a better overall picture than a single fasting measurement, but this test can also still be normal in the early stage of insulin resistance.

Fasting insulin. This is the test that makes the difference — and one that is requested far too rarely. Your fasting insulin shows how much insulin your pancreas needs to produce to keep your blood sugar normal. A value above 10-12 mU/L already points to insulin resistance, even if your glucose is still perfect. Ask specifically about this when seeing your GP.

HOMA-IR (Homeostatic Model Assessment). This is a calculation made based on your fasting glucose and fasting insulin. The formula is: (fasting insulin x fasting glucose) / 22.5. A value above 2.0 points to insulin resistance, above 2.5 it's virtually certain. HOMA-IR is currently the best available estimate of insulin resistance without invasive tests.

Nutritional approach: stabilising blood sugar

Nutrition is the most powerful tool you have to reverse insulin resistance. No strict diet, no calorie counting — but a smart way of eating that keeps your blood sugar stable and restores your insulin sensitivity. It revolves around three principles: what you eat, how much you eat and in which order you eat.

Protein at every meal: your foundation. Protein is your most important ally with insulin resistance. It has minimal impact on blood sugar, keeps you full for longer and prevents muscle mass loss. Aim for 25-35 grams of protein per meal. Start your day with a protein-rich breakfast: eggs, Greek yoghurt with nuts, or a protein-rich smoothie with cottage cheese. A breakfast of bread with jam or cornflakes is exactly what you don't need — it shoots your blood sugar up and two hours later you're hungry again.

Healthy fats: slow the blood sugar spike. Fat slows stomach emptying, allowing glucose to enter your blood more gradually. Moreover, fat has barely any effect on your insulin level. Choose avocado, extra virgin olive oil, nuts, seeds and oily fish. Don't cut fat from your diet. A low-fat diet is one of the most counterproductive things you can do with insulin resistance, because you almost inevitably replace fat with carbohydrates.

Fibre: the invisible hero. Fibre slows the absorption of glucose, feeds your good gut bacteria and helps with the removal of excess oestrogen. Aim for at least 30 grams of fibre per day from vegetables, legumes, nuts, seeds and wholegrain products. Soluble fibre in particular — from oats, legumes, flaxseed and chia seeds — is effective at stabilising blood sugar.

Carbohydrates: choose wisely, don't eliminate. You don't need to completely avoid carbohydrates, but you need to use them wisely. Choose complex carbohydrates with a low glycaemic index: sweet potato, quinoa, wholegrain products, legumes and vegetables. Avoid refined sugars, white flour, fizzy drinks and juices. And never eat carbohydrates on an empty stomach or as the main component of your meal.

The order of eating: a game changer. Recent research shows that the order in which you eat your meal has a surprisingly large effect on your blood sugar levels. The optimal order is:

1. Vegetables and fibre first — these create a kind of gel layer in your stomach and intestines
2. Then protein and fat — these slow stomach emptying
3. Carbohydrates last — these are now absorbed much more slowly

Simply by eating in this order, you can reduce your blood sugar spike by 30 to 75 percent — without changing what you eat. A 10-minute walk after your meal amplifies this effect even further.

Other nutrition tips:

• Eat at regular times and don't skip meals
• Limit snacking — give your insulin the chance to drop between meals
• Drink a glass of water with a splash of apple cider vinegar before your meal (this can blunt the blood sugar spike)
• Limit alcohol — it disrupts your blood sugar regulation and burdens your liver
• Choose cinnamon in your coffee or oats — this spice can improve insulin sensitivity

Movement: strength training and walking

Movement, alongside nutrition, is the most powerful intervention to reverse insulin resistance. But not all movement is equal. With insulin resistance, two forms of movement are by far the most effective: strength training and walking after meals.

Strength training: the insulin sensitivity booster. Your muscles are the largest consumers of glucose in your body. The more muscle mass you have, the more glucose you can process without your insulin going through the roof. Strength training is therefore the most effective form of movement for insulin resistance. It improves your insulin sensitivity for up to 48 hours after training, prevents age-related muscle mass loss and increases your resting metabolism.

You don't need to become a bodybuilder. Two to three strength training sessions per week of 30 to 45 minutes are sufficient. Focus on large muscle groups: squats, deadlifts, rowing movements, shoulder pressing. Start with light weight and build up gradually. The goal is that your muscles are regularly loaded and stimulated to grow.

Walking after meals: simple but powerful. A walk of 10 to 15 minutes after eating is one of the simplest and most effective things you can do for your blood sugar. Your muscles use glucose while walking, which flattens the spike after your meal. Research shows that even a short walk after eating can reduce the blood sugar spike by 30 percent. Make it a habit: after dinner, a stroll around the neighbourhood. It's good for your blood sugar, your digestion and your mental calm.

What to avoid: Prolonged intensive cardio and excessive HIIT sessions. Although movement in any form is better than sitting still, training too intensively can raise your cortisol, which actually worsens insulin resistance. That doesn't mean you can never run or do an intensive class — but make sure the foundation consists of strength training and walking, and that you recover sufficiently between intensive sessions.

Lifestyle: sleep and stress

Nutrition and movement are the visible pillars, but the invisible factors of sleep and stress are just as decisive for your insulin sensitivity. You can eat perfectly and train faithfully, but if you chronically sleep poorly or are under chronic stress, you're pressing the other foot on the brake.

Sleep: the nightly reset. Poor sleep is a direct trigger for insulin resistance. After just a single night of insufficient sleep (less than six hours), your insulin sensitivity measurably drops. After a week of sleep deprivation, your insulin sensitivity may have fallen by 25 to 30 percent. During deep sleep, your body regulates your blood sugar, repairs your muscles and brings your stress hormones back into balance.

Concrete steps for better sleep:

• Aim for 7 to 8 hours of sleep per night
• Go to bed and get up at the same time every day
• Keep your bedroom cool (16-18 degrees), dark and quiet
• Avoid caffeine after 2 pm — it has a half-life of 5 to 7 hours
• Stop using screens at least one hour before bed
• Consider magnesium bisglycinate before sleep — this mineral supports relaxation and insulin sensitivity

Stress: the cortisol-insulin connection. Chronic stress is one of the most underestimated causes of insulin resistance. Cortisol raises your blood sugar so that your body is ready for action. But when that action never comes — because the stress is mental rather than physical — the glucose keeps circulating in your blood and your pancreas has to overwork to clear it away. Chronic stress is like continuously pressing the accelerator while stuck in traffic.

Effective stress regulation:

• Breathing exercises: inhale for 4 counts through your nose, exhale for 6-8 counts through your mouth. This directly activates your parasympathetic nervous system
• 20 to 30 minutes of outdoor walking daily, preferably in the morning for natural daylight
• Consciously setting boundaries: saying no is not selfishness, it's self-care
• Building in pauses throughout the day, even if it's just five minutes doing nothing
• Activities that calm your nervous system: nature, music, creative pursuits, contact with friends

Your action plan: start today

Reversing insulin resistance is not a matter of a miracle pill or a crash diet. It is the result of daily, achievable choices that you implement step by step. Don't try to change everything at once, but start with two or three adjustments and build from there. Below is a concrete action plan.

Every step you take makes a difference. Your muscles become more sensitive to insulin after just one strength training session. Your blood sugar spike drops directly when you walk after eating. Your cortisol falls when you sleep better. The effects accumulate and reinforce each other. After four to six weeks you can expect a noticeable improvement in your energy, your cravings and your waist circumference.

Most importantly: be kind to yourself in this process. Insulin resistance is not your fault. It's a combination of hormonal changes, lifestyle factors and sometimes just bad luck. But it is something you have enormous influence over. With the right knowledge and the right steps, you can reverse it and feel energetic, clear-headed and yourself again.