Table of Contents

Key Takeaways

  • Insulin resistance occurs when your body becomes unresponsive to insulin, a hormone that stabilizes your blood sugar levels.
  • Insulin resistance affects approximately one in every three Americans.
  • Doctors often prescribe metformin as an off-label treatment for insulin resistance.
  • Combining regular exercise with a healthy diet, medications, and supplements can help reverse insulin resistance.

Many people with insulin resistance don’t know they have it. That’s because it often doesn’t have any symptoms. Without blood tests, a person may live with the condition for years without realizing it. Insulin resistance is a precursor to prediabetes and diabetes, conditions that affect millions of Americans. Learning when to consult your healthcare provider to seek advice and how to manage the condition can help prevent it from advancing to diabetes.

What Is Insulin Resistance?

When you eat, the beta cells in your pancreas release insulin — a hormone that helps move sugar from your blood into the cells to turn it into energy. This is how your body keeps your blood sugar levels within a healthy range. Insulin resistance occurs when your body’s cells stop responding appropriately to insulin, meaning they don’t absorb glucose from the bloodstream as effectively. As a result, blood sugar levels increase, which can possibly progress to prediabetes and type 2 diabetes if left untreated.

In the U.S., 1 in 3 Americans has insulin resistance. Fortunately, it’s reversible with medications and lifestyle interventions. But the challenge is detecting the condition early since many people with insulin resistance or even prediabetes show no symptoms. Assessing your risk can help determine if you’re predisposed to the condition.

What Causes Insulin Resistance?

Unlike other conditions, there’s no single cause for insulin resistance. It develops through a combination of biological and lifestyle influences. Take, for example, women with polycystic ovary syndrome (PCOS) who are more susceptible to insulin resistance than those without it

For instance, women with polycystic ovary syndrome (PCOS) are more likely to be insulin resistant than women without it. It happens due to hormonal imbalance, particularly androgens, which alter how efficiently insulin functions.

Similarly, people who consume too much refined carbs, drink alcohol in excess, or live a sedentary lifestyle are at a higher risk for insulin resistance compared to individuals with active lifestyles. 

Individuals living with type 1 diabetes can also develop insulin resistance. What causes insulin resistance in those with type 1 diabetes? Two factors are high insulin doses and excessive weight.

Other factors that contribute to reduced insulin sensitivity are:

    • Genetics: A family history of type 2 diabetes increases your risk of being insulin resistant.
    • Hormonal imbalances: People diagnosed with PCOS, Cushing’s syndrome, and hypothyroidism often have problems with their insulin signaling. 
    • Aging: Declining muscle mass during old age can reduce insulin efficiency.
    • Poor sleep: The lack of sleep negatively affects your glucose control and other metabolic hormones.
    • Smoking: Nicotine induces insulin resistance.
    • Certain medications: Regular use of corticosteroids and antipsychotics can reduce insulin sensitivity. 
    • Pregnancy hormones: The hormonal fluctuations during pregnancy can lead to gestational insulin resistance. 

Your doctor can help examine all the contributing factors that result in insulin resistance. 

What Are the Symptoms of Insulin Resistance?

Not everyone with insulin-related issues exhibits noticeable symptoms. In fact, most people don’t at first. It can silently develop for many years without you feeling any different. As it worsens, subtle signs may start to appear. These include:

    • Fatigue
    • Weight gain
    • Persistent hunger 
    • Darkened skin patches
    • High blood pressure
    • High cholesterol

Women may experience unique symptoms. Most insulin resistance symptoms in females are often associated with PCOS. They include: 

    • Irregular or missed periods
    • Acne, specifically along the jawline or chin
    • Excess hair growth
    • Thinning hair
    • Skin tags
    • Mood swings

Hormonal imbalances can lead to these distinct symptoms of insulin resistance in women. If your risk for this condition is high and you experience a combination of these symptoms, consult your doctor for a comprehensive health examination. 

How Is Insulin Resistance Diagnosed?

Insulin resistance is diagnosed through several blood tests that measure how your body processes insulin. There are various options to detect impairment in insulin function. Common ones that test for insulin resistance include: 

Hemoglobin A1c Test

The HbA1c test helps diagnose prediabetes and type 2 diabetes, measuring your average blood sugar levels over the past 2-3 months. Your doctor will collect a small blood sample and measure the amount of glucose attached to your hemoglobin. Your results can be either of the three: 

    • Below 5.7%: Normal
    • 5.7% to 6.4%: Prediabetes
    • 6.5% or higher: Diabetes

This test is useful if you’ve had insulin resistance for years without realizing it, as it can detect rising blood sugar levels early.

Fasting Insulin Test

This measures your blood sugar levels after not eating or drinking for 8-12 hours. The normal range for fasting insulin varies depending on the laboratory and individual factors. Typically, results under 25 µU/mL are considered normal. 

You may have impaired insulin sensitivity if your blood glucose level is normal or slightly elevated and your insulin level is high. 

Oral Glucose Tolerance Test

This oral glucose tolerance test (OGTT) assesses how well your body processes sugar. This test is completed in two hours and checks your glucose levels before and after. Your doctor will first check your glucose levels, then give you a sweet drink. Two hours later, they’ll recheck your blood sugar levels. Results are interpreted as follows: 

    • Less than 140 mg/dL: Normal
    • 140 to 199 mg/dL: Prediabetes
    • 200 mg/dL or higher: Higher

If you’re not insulin resistant, your blood sugar levels should return to normal within 2 to 3 hours. Otherwise, your doctor may perform another test to confirm if your body has difficulty processing glucose. 

An insulin resistance test can help diagnose prediabetes or problems with insulin function, even if you don’t have any symptoms. In addition, your doctor may review your medical history and examine other risk factors that may contribute to insulin resistance. If you’re at risk, regular blood tests are essential for detecting problems early. 

How Can Insulin Resistance Be Prevented?

Adopting positive lifestyle habits is the best way to prevent or even reverse insulin resistance if you already have it. Consider the following tips to help your body respond to insulin more efficiently.

  • Eat a Balanced Diet

    Prevention begins with being selective of the food you consume. Choose real, unprocessed foods rich in lean proteins. Include high-fiber vegetables and fruits, whole grains, and healthy fats as well. Chicken breast, fish, and seafood are excellent sources of lean protein. Skip white bread, pasta, and store-bought baked goods. They’re packed with refined carbs that perk up your glucose levels and worsen insulin resistance.

  • Include Foods That Naturally Improve Insulin Sensitivity

    Options include leafy greens, like spinach, berries, and carbs that have a low glycemic index (GI). Examples are quinoa and sweet potatoes. Beans, chicken, and tofu are rich in dietary protein that promotes glucose uptake. One study found that a high-protein diet is more effective at improving insulin sensitivity in insulin-resistant obese women than the Mediterranean diet.

  • Consider Taking Supplements

    Magnesium, berberine, and omega-3 fatty acids are some supplements that help reverse insulin resistance by improving glucose metabolism. However, before starting any supplement regimen, consult your doctor to confirm it’s safe for you. They’re like natural alternatives to metformin, helping to lower blood sugar levels.

  • Exercise Regularly

    Make movement part of your daily routine. Regular physical activity can help reverse or prevent insulin resistance by pulling glucose from the bloodstream, lowering your blood sugar levels, and making your cells more sensitive to insulin. The rule of thumb is to incorporate at least 150 minutes of moderate-intensity exercise into your routine.

  • Manage Stress and Prioritize Sleep

    Chronic stress is a source of inflammation and can worsen symptoms associated with insulin resistance. The same is true for the lack of sleep. Learning how to manage stress and getting adequate sleep can save you from many health issues. To manage stress effectively, try incorporating relaxation techniques such as yoga, deep breathing, and meditation. To ensure you get enough sleep, improve your bedtime habits. Limit screen time an hour or two before you go to bed.

By consistently adopting these positive lifestyle habits, you can promote long-term metabolic health and reduce your risk of developing insulin resistance.

What Are the Complications of Insulin Resistance?

Untreated insulin resistance can lead to many complications. Prediabetes and type 2 diabetes are the most predominant ones. Most people with insulin resistance develop type 2 diabetes 10 to 15 years later. Other metabolic problems associated with unmanaged insulin resistance are: 

    • High blood sugar (hyperglycemia)
    • Unhealthy cholesterol levels (dyslipidemia)
    • High blood pressure (hypertension)
    • High uric acid levels (hyperuricemia)
    • Inflammation in the body (elevated inflammatory markers)
    • Increased blood clot risk (prothrombotic state)
    • Poor blood vessel function (endothelial dysfunction)

Insulin resistance negatively affects your metabolism. Metabolism and heart conditions are closely tied, which means untreated insulin resistance can increase your risk of not only diabetes, but also heart attack, coronary heart disease, heart failure, and stroke. 

How to Treat Insulin Resistance?

For insulin resistance treatments, your doctor may recommend combining lifestyle changes with medications or supplements to improve insulin sensitivity. 

Lifestyle strategies include maintaining a healthy diet, exercising regularly, getting sufficient sleep, and learning effective stress management techniques. For medications, many doctors prescribe metformin for treating insulin resistance, PCOS, and prediabetes off-label. 

Additionally, your doctor may recommend supplements, such as omega-3 fatty acids, as part of your treatment regimen. Reversing insulin resistance takes time, but you may see better results if you pair it with a healthy diet and exercise. Follow your doctor’s medication instructions and watch out for side effects. Consult your doctor if you need further treatment guidance. 

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Insulin Resistance Is Reversible

Most people get anxious about learning that they’re insulin resistant because it can progress to diabetes if left untreated. Insulin resistance can be reversed in several ways. You can prevent it from progressing into prediabetes or full-blown diabetes. For this, you’ll have to work with your healthcare provider and follow their treatment advice. 

While treatments for insulin resistance are widely accessible, it’s better to prevent it before it even starts. One effective approach is to adopt sustainable health habits. Regular exercise, adequate sleep, and a balanced diet are natural methods to promote optimal insulin function and sidestep insulin resistance. 

Frequently Asked Questions

No. Ozempic doesn’t cause insulin resistance. In fact, it helps improve insulin sensitivity and is commonly prescribed for treating type 2 diabetes.

About 1 in every 3 Americans has insulin resistance. Not only does it increase the risk of diabetes, but it also doubles the risk of depression.

The hormones that contribute to insulin resistance in pregnant women include estradiol, cortisol, prolactin, human placental lactogen (hPL), and human placental growth hormone (hPGH).

A combination of lifestyle habits and medication can help treat insulin resistance. Your doctor will tailor your treatment regimen to your specific needs.

The HbA1c, fasting insulin, and oral glucose tolerance tests can help predict your risk of insulin resistance.

According to the study mentioned above, a high-protein diet is more effective than the Mediterranean diet in enhancing insulin sensitivity. But each person’s needs are unique, so you can work with a dietitian to determine the best diet for you.

To reduce belly fat, focus on making lifestyle adjustments, such as regular exercise and eating a healthy diet. It takes consistent habits to lose weight around the stomach area. 

If you pair medications with healthy lifestyle habits, it may take a few weeks to see changes in your blood test results. In one study, patients with metabolic syndrome required eight weeks of lifestyle modification to improve insulin resistance.

Yes. Hypothyroidism disrupts glucose metabolism, potentially leading to insulin resistance.

No. A keto diet can help people lose weight, which can enhance insulin sensitivity in those with obesity. One study found that a 3-week keto diet can help boost how muscles respond to insulin in individuals with obesity.

Yes, alcohol consumption can induce inflammation and cause hormonal imbalance, which contributes to systemic insulin resistance.

Yes. Unmanaged stress can lead to inflammation, which in turn contributes to insulin resistance.

Yes. Insulin resistance is common in women with PCOS. They have higher levels of androgens, a male hormone, which disrupts the balance of other hormones in the body. The result is insulin resistance.

Original Publish Date: 12/17/2020 – Updated 10/10/2025