Could You Still Have Insulin Resistance If Your Blood Sugar Is 'Normal'?
You just had your annual blood work, and your doctor tells you everything looks normal — including your blood sugar. You leave feeling reassured, but something still doesn't feel quite right.
You're constantly tired after meals. The weight around your midsection won't budge despite eating well and exercising. You crave carbohydrates in the afternoon, wake up hungry, or struggle with acne, irregular periods, or difficulty conceiving — even though you've been told your labs are "fine."
So what gives?
The short answer: yes, you can have insulin resistance with completely normal blood sugar. Insulin resistance can develop years before blood sugar becomes abnormal, because the pancreas compensates by producing more insulin to keep glucose in range. Understanding this distinction can help identify metabolic changes early, when there is still an opportunity to address contributing factors before they progress.
First, What is Insulin?
Insulin is a hormone produced by the pancreas. Every time you eat carbohydrates, your digestive system breaks them down into glucose, which enters your bloodstream. Insulin then helps move that glucose from your bloodstream into your muscle, liver, and fat cells, where it's used for energy or stored for later.
When everything is working well, blood sugar rises after a meal, the pancreas releases insulin, cells respond appropriately, and blood sugar returns to its normal range — an efficient system, until it stops working as it should.
What Is Insulin Resistance?
Insulin resistance occurs when cells — especially in muscle, liver, and fat tissue — become less responsive to insulin's signal. Think of it like knocking on a door: at first someone answers right away, but over time they get slower to respond, so you have to knock louder and more often. Your pancreas does the same thing, compensating by producing more and more insulin to keep blood sugar within range.
The important point: your blood sugar can stay completely normal because your insulin is working overtime behind the scenes.
Eventually, the pancreas may no longer keep up with the demand. Beta-cell function declines, blood sugar begins to rise, and the progression from normal glucose to prediabetes — and in some cases type 2 diabetes — can begin. Insulin resistance often exists long before that transition happens.
Why Standard Blood Work Can Miss It
Most routine panels include fasting glucose and HbA1c (average blood sugar over roughly two to three months). These are useful, but they only tell us how much glucose is circulating — not how much insulin your body had to produce to keep it there.
Two people can have an identical fasting glucose of 5.0 mmol/L. One person's pancreas needs only a small amount of insulin to hold that number; the other's may be producing significantly more insulin for the exact same result. On paper they look identical. Metabolically, they may be very different — which is part of why someone can feel unwell despite being told their blood sugar is "perfect."
Major clinical guidelines currently screen for prediabetes and diabetes using fasting glucose, HbA1c, or an oral glucose tolerance test; routine fasting insulin testing isn't part of standard protocols. That doesn't mean insulin resistance can't be detected earlier — research consistently shows tools like fasting insulin and HOMA-IR can identify insulin resistance while glucose still looks completely normal.
Signs That May Suggest Insulin Resistance
Insulin resistance doesn't always cause obvious symptoms, and many people have it for years without realizing it. Certain patterns, interpreted alongside history and labs, may raise suspicion:
Increased abdominal or visceral weight gain
Difficulty losing weight despite lifestyle changes
Strong cravings for sugar or refined carbohydrates
Energy crashes after meals
Persistent fatigue
Skin tags
Darkened, velvety skin around the neck, underarms, or groin (acanthosis nigricans)
Elevated triglycerides
Low HDL cholesterol
High blood pressure
Metabolic-associated fatty liver disease
Acanthosis nigricans deserves special mention: research shows it's a highly specific clinical sign of insulin resistance, with a specificity of roughly 85–90% depending on the population studied. No single sign confirms insulin resistance on its own, but several appearing together can warrant a closer look.
The PCOS/PMOS Connection
Insulin resistance is especially important to consider in women with PCOS/PMOS. Research suggests roughly 50–70% of women with PCOS/PMOS have some degree of insulin resistance — including women at a lean body weight. Studies using euglycemic-hyperinsulinemic clamp testing (the gold standard for measuring insulin sensitivity) have found that up to 75% of lean women with PCOS/PMOS demonstrate insulin resistance, pointing to an intrinsic metabolic component independent of body weight.
Higher insulin levels can stimulate the ovaries to produce more androgens (like testosterone), in part through a post-receptor signaling defect that increases androgen production while decreasing insulin sensitivity. This can contribute to:
Irregular or absent menstrual cycles
Excess facial or body hair (hirsutism)
Difficulty ovulating
The American College of Obstetricians and Gynecologists notes that insulin resistance may be central to the root cause of PCOS/PMOS, and that compensatory hyperinsulinemia can lower sex hormone-binding globulin (SHBG), increasing bioavailable circulating androgens. Because insulin resistance plays such a significant role in many cases of PCOS/PMOS, understanding whether it's present can offer valuable context when investigating hormonal symptoms.
Why It Matters Beyond Diabetes
Insulin affects nearly every organ system in the body — not just blood sugar regulation. Research links insulin resistance, even with normal blood sugar, to an increased risk of:
Prediabetes and type 2 diabetes
Cardiovascular disease
Metabolic-associated fatty liver disease
Metabolic syndrome
Certain reproductive conditions, including PCOS/PMOS
Pregnancy complications such as gestational diabetes
This doesn't mean insulin resistance guarantees these outcomes. Identifying metabolic changes early creates an opportunity to understand your full health picture and address contributing factors over time.
If Blood Sugar Isn't Enough, What Else Can Be Assessed?
Depending on medical history, symptoms, and risk factors, a broader evaluation is often used to understand metabolic health more completely:
Fasting insulin, interpreted alongside fasting glucose, to estimate insulin resistance
An insulin glucose challenge test, showing how blood sugar and insulin respond after a standardized glucose drink
Lipid profile (particularly triglycerides and HDL cholesterol)
Liver function tests
Waist circumference
Blood pressure
Family history
Body composition and lifestyle assessment
No single test diagnoses insulin resistance in every person. In clinical practice, we look at the full picture — symptoms, physical findings, family history, and lab data together.
Who Should Consider Looking Into Insulin Resistance?
It may be worth a conversation with a healthcare provider if you have:
PCOS/PMOS
A family history of type 2 diabetes
A history of gestational diabetes
Difficulty losing weight despite healthy habits
Persistent fatigue or energy crashes
Elevated triglycerides or low HDL cholesterol
Fatty liver disease
High blood pressure
Prediabetes
Acanthosis nigricans or skin tags
A history of unexplained infertility or irregular menstrual cycles
Even if your blood sugar is normal, these factors may warrant a broader conversation about metabolic health.
What Can Be Done About Insulin Resistance?
The strongest evidence for addressing insulin resistance comes from lifestyle intervention. The landmark Diabetes Prevention Program (DPP) trial found that intensive lifestyle modification — dietary changes plus at least 150 minutes per week of moderate-intensity activity — reduced the incidence of type 2 diabetes by approximately 58% compared with placebo in people with prediabetes. Key evidence-based strategies include:
Regular physical activity: both aerobic exercise and resistance training improve insulin sensitivity, even without significant weight loss. Even short bouts of higher-intensity activity (as little as 20 minutes) can enhance insulin action for up to 24–48 hours.
Dietary changes: Mediterranean-style and plant-based eating patterns are associated with improved insulin sensitivity and reduced cardiometabolic risk; reducing processed and ultra-processed food intake may help as well.
Modest weight loss: a loss of 5–7% of body weight in individuals who are overweight has been shown to meaningfully improve metabolic markers, with benefits that continue with further weight loss.
These interventions work through multiple mechanisms — reducing visceral fat, improving muscle glucose uptake, and enhancing insulin signaling pathways.
Looking Beyond a Single Lab Value
One of the biggest misconceptions in healthcare is that "normal" always means "optimal." Reference ranges are valuable, but they're one piece of the puzzle. Good care also considers your symptoms, your history, your family history, trends over time, and your overall metabolic picture.
Two people can have identical lab values and very different health outcomes, because their full clinical picture is different. That's why persistent symptoms are worth investigating, even when one number falls within range.
The Bottom Line
Normal blood sugar does not always rule out insulin resistance. For many people, insulin resistance develops quietly while blood sugar stays controlled through increased insulin production — and symptoms can already be present even when routine screening looks reassuring.
If you've been told your blood sugar is normal but continue to experience fatigue, weight changes, irregular cycles, acne, or other metabolic concerns, it may be worth taking a broader look. A comprehensive assessment considers far more than a single lab value.
Ready to Better Understand Your Health?
If you're wondering whether insulin resistance could be contributing to your symptoms, you don't have to figure it out alone.
At The Clara Clinic, we take a comprehensive, evidence-informed approach to understanding metabolic and hormonal health. Rather than focusing on one lab result in isolation, we consider the whole picture, including your symptoms, medical history, lifestyle, and any relevant testing, to help identify potential underlying contributors.
If you're curious about whether naturopathic care is the right fit for you, you're invited to book a complimentary discovery call. It's an opportunity to discuss your concerns, ask questions, and learn how a personalized assessment may help you better understand what's going on beneath the surface.
Ready to make a change?
Book a complimentary 15-minute consult to learn how naturopathic care can help you address insulin resistance with confidence. We’ll discuss your concerns, review what testing might be helpful, and explore personalized strategies to support your metabolic and hormonal health.
Be well,
Dr. Simone Pirita, ND
Frequently Asked Questions About PMOS/PCOS & Stress
Can you have insulin resistance with normal blood sugar?
Yes. Insulin resistance can develop years before fasting glucose or HbA1c become abnormal, because the pancreas compensates by producing more insulin to keep blood sugar in a normal range. Fasting insulin and HOMA-IR testing can identify this earlier than standard glucose screening.
What are the early signs of insulin resistance?
Common signs include abdominal weight gain, sugar or carbohydrate cravings, energy crashes after meals, persistent fatigue, skin tags, and acanthosis nigricans (darkened, velvety skin at the neck, underarms, or groin). None of these confirms insulin resistance alone, but several together may warrant further evaluation.
How is insulin resistance connected to PCOS/PMOS?
Research suggests roughly 50–70% of women with PCOS/PMOS have some degree of insulin resistance, including women at a lean body weight. Elevated insulin can stimulate the ovaries to produce more androgens and lower SHBG, which may contribute to irregular cycles, acne, hirsutism, and fertility challenges.
What tests check for insulin resistance beyond blood sugar?
Fasting insulin (interpreted alongside fasting glucose), an insulin glucose challenge test, a lipid profile, liver function tests, waist circumference, and blood pressure are commonly used alongside symptom history and family history to build a fuller picture.
Can insulin resistance be improved naturally?
The strongest evidence points to lifestyle intervention: regular aerobic and resistance exercise, a Mediterranean-style or plant-based eating pattern, and — where relevant — a modest 5–7% reduction in body weight. These approaches improve insulin sensitivity through several mechanisms, including reduced visceral fat and better muscle glucose uptake.