8 Signs of Insulin Resistance: How to tell if you have Insulin Resistance

Something feels off, but you can’t quite put your finger on it. You’re more tired than you used to be. The weight is creeping up despite eating carefully. You get intensely hungry a couple hours after meals. Your brain feels foggy in the afternoon. You crave sugar and carbs in a way that feels almost compulsive.

You’ve mentioned these things to your doctor, maybe even had labs drawn. Everything came back “normal.” You’re told you’re fine, that maybe you just need to sleep more or stress less. But the symptoms persist, and you can’t shake the feeling that something is happening in your body that isn’t being addressed.

If this sounds familiar, you might be asking yourself: “Do I have insulin resistance?”

In Dr. Allison Pope Barbee’s clinical experience at SustainMD, this is exactly the pattern many patients describe when they first seek care. They’ve been experiencing subtle but persistent symptoms for months or even years, but because their fasting glucose and A1C are still in the normal or borderline range, they’ve been told there’s nothing to worry about. The truth is, insulin resistance typically develops years before blood sugar becomes obviously elevated—and those early symptoms you’re experiencing are your body’s way of telling you something important.

Understanding how to tell if you have insulin resistance before it progresses to prediabetes or diabetes can open the door to early intervention when metabolic dysfunction is most reversible.

What Insulin Resistance Is (Before Diabetes Develops)

Insulin resistance is a metabolic condition where your cells stop responding properly to insulin, the hormone that helps glucose enter your cells to be used for energy.

Here’s what happens: When you eat, your pancreas releases insulin to help glucose from your food get into your cells. With insulin resistance, your cells become less responsive to insulin’s signal. To compensate, your pancreas produces more and more insulin to get the job done. For a while—often for years—this compensation works. Your blood sugar stays in the normal range because the extra insulin is forcing glucose into cells despite the resistance.

This is the critical point: you can have significant insulin resistance without diabetes. During this compensation phase, your fasting glucose might be completely normal (under 100 mg/dL), your A1C might be in the normal range (under 5.7%), but your insulin levels are climbing higher and higher, working overtime to maintain those normal-looking blood sugar numbers.

This early stage of insulin resistance creates real symptoms and real health consequences even when standard screening still appears reassuring. At SustainMD, Dr. Barbee evaluates insulin resistance as a spectrum condition that begins long before diabetes develops. The goal is catching and treating it early, not waiting until dysfunction progresses.

Why Early Signs of Insulin Resistance Is Often Missed

Despite how common insulin resistance is—affecting an estimated 40% of American adults—early-stage insulin resistance is frequently overlooked in standard medical care.

Standard labs focus on glucose, not insulin. Most routine screening includes fasting glucose and sometimes A1C, but rarely measures fasting insulin. Since insulin levels rise years before glucose becomes elevated, this screening approach misses the earliest and most treatable stage of metabolic dysfunction.

Symptoms get dismissed when labs are “normal.” When patients describe fatigue, weight gain, cravings, or energy crashes but their glucose screening comes back fine, these symptoms are often attributed to stress, aging, or busy schedules. The possibility of underlying insulin resistance doesn’t get explored.

The medical system often takes a “wait and see” approach. Even when labs show early warning signs of Insulin Resistance—fasting glucose creeping from 85 to 95, A1C rising from 5.2% to 5.5%—the standard approach is often to monitor and wait until numbers cross into prediabetes range before intervening.

At SustainMD, the philosophy is fundamentally different. Dr. Barbee listens carefully to symptom patterns, evaluates metabolic health comprehensively including fasting insulin when appropriate, and focuses on prevention and early intervention rather than waiting for dysfunction to progress.

Common signs and symptoms of Insulin Resistance

If you’re wondering how to know if you have insulin resistance, these signs of Insulin Resistance often appear years before diabetes develops:

1. Stubborn, unexplained weight gain—especially around your midsection. One of the earliest, most frustrating signs of Insulin Resistance is weight accumulating despite no significant diet or activity changes. High insulin signals your body to store fat, particularly around the abdomen, while blocking fat burning.

2. Persistent fatigue and afternoon energy crashes. Even with adequate sleep, you feel tired much of the time. Many describe hitting a wall in the afternoon—sudden, profound fatigue making it hard to concentrate.

3. Intense cravings for carbohydrates and sugar. When cells can’t properly access energy from food due to insulin resistance, your brain gets biochemical signals needing more fuel. This drives powerful cravings for quick energy sources like bread, pasta, sweets, or chips.

4. Feeling shaky, irritable, or “hangry” between meals. Even with normal fasting glucose, insulin resistance can cause blood sugar instability throughout the day. You eat a meal, blood sugar and insulin spike, then hours later you crash and feel terrible until you eat again.

5. Brain fog and difficulty concentrating. Your energy-dependent brain suffers when insulin resistance impairs glucose metabolism. You might notice you’re forgetting things more often or struggling to focus on previously easy tasks.

6. Increased hunger shortly after eating. Insulin resistance disrupts hormones regulating hunger and fullness. You might feel genuinely hungry just an hour or two after eating a substantial meal.

7. Skin changes. Some develop darkened, velvety patches around the neck, armpits, or groin (acanthosis nigricans). This visible marker indicates underlying insulin resistance even when labs appear normal.

8. Difficulty losing weight despite genuine effort. Perhaps the most frustrating symptom is that standard diet and exercise approaches stop working. You restrict calories and increase exercise, but your body doesn’t respond as it should.

At SustainMD, patients often describe several of these patterns together. Learning these symptoms have a medical explanation—and are treatable—is often a huge relief.

How to tell if you have Insulin Resistance Without Diabetes?

Insulin resistance exists on a spectrum. It typically begins subtly and progresses gradually over years or decades. During early and middle stages, your pancreas compensates by producing extra insulin, which keeps blood sugar in normal range despite cellular resistance.

This compensation phase—where you have insulin resistance without diabetes—can last 5, 10, even 15 years or more. During this entire time, you may experience all the symptoms described above while fasting glucose and A1C remain completely normal on standard screening.

Eventually, if insulin resistance isn’t addressed, your pancreas can become exhausted. When it can no longer produce enough insulin to overcome resistance, blood sugar begins to rise—first into prediabetes range, eventually into diabetes range if progression continues.

But here’s the crucial point: you don’t have to wait until you develop prediabetes or diabetes to address insulin resistance. Catching and treating it during this earlier phase gives you the best chance of fully reversing metabolic dysfunction and preventing progression entirely.

At SustainMD, Dr. Barbee focuses specifically on this early intervention window, identifying and treating insulin resistance before it progresses.

When to Ask “Do I Have Insulin Resistance?”

Consider evaluation if you have unexplained weight gain (particularly around your midsection), persistent fatigue or afternoon crashes, intense cravings for carbohydrates or sugar, shakiness or irritability between meals, brain fog or memory problems, difficulty losing weight despite genuine effort, family history of type 2 diabetes, “borderline” glucose or A1C results, PCOS, or are experiencing perimenopause.

The question “how to tell if you have insulin resistance” isn’t something you answer alone through self-diagnosis. These symptoms suggest the need for professional medical evaluation including comprehensive metabolic assessment that goes beyond basic glucose screening.

At SustainMD, Dr. Barbee evaluates insulin resistance through detailed health history and symptom patterns, comprehensive lab testing including fasting insulin, assessment of other metabolic markers, and clinical judgment that considers your complete health picture.

Why Early, Physician-Guided Care Matters

Catching insulin resistance early—before prediabetes or diabetes—provides crucial advantages.

Insulin resistance is most reversible when caught early. Addressing it before pancreas exhaustion and chronic blood sugar elevation gives excellent potential for restoring normal insulin sensitivity.

Early intervention prevents diabetes progression. Research shows lifestyle interventions and medical treatment can reduce diabetes risk by 50-70% or more during early insulin resistance stages.

Symptoms often improve quickly. Even before substantial weight loss, patients frequently notice improved energy, reduced cravings, better mental clarity, and more stable mood within weeks.

You reduce multiple long-term health risks. Untreated insulin resistance increases risk for cardiovascular disease, fatty liver disease, certain cancers, Alzheimer’s disease, and PCOS.

SustainMD’s telemedicine practice makes early evaluation and treatment accessible regardless of location or schedule.

Insulin Resistance Boot Camp: Early Intervention That Works

SustainMD’s Insulin Resistance Boot Camp is a 3-month, physician-supervised program for people with early-stage insulin resistance.

The Boot Camp includes: direct supervision by Dr. Allison Pope Barbee, MD; comprehensive metabolic evaluation including fasting insulin and testing beyond basic glucose screening; personalized nutrition strategies improving insulin sensitivity; evidence-based lifestyle interventions supporting metabolic healing; ongoing monitoring and adjustment; focus on sustainable metabolic restoration; and a judgment-free environment.

Trust Your Body and Seek Early Answers

If you’re experiencing persistent fatigue, stubborn weight gain, intense cravings, or brain fog—even if your doctor says your labs are normal—trust your body is trying to tell you something important.

Early signs of Insulin Resistance appear long before diabetes develops. These symptoms aren’t in your head or just normal aging. They’re often the first indication of metabolic dysfunction deserving medical attention.

Learn more about SustainMD’s Insulin Resistance Boot Camp and discover how physician-led care can help you identify and reverse insulin resistance when treatment is most effective.

Frequently Asked Questions

How can I tell if I have insulin resistance?

Common signs of Insulin Resistance include midsection weight gain, fatigue, carb cravings, brain fog, and difficulty losing weight, but accurate diagnosis requires medical evaluation and metabolic testing.

What are the first signs of insulin resistance?

Early signs often include stubborn weight gain, frequent hunger, carb cravings, and afternoon energy crashes—often years before glucose or A1C become abnormal.

Can insulin resistance exist without diabetes?

Yes—insulin resistance commonly exists for many years before prediabetes or diabetes develops because insulin levels rise to keep blood sugar normal.

Do I need labs to diagnose insulin resistance?

Yes—symptoms alone aren’t enough; diagnosis typically requires lab testing such as fasting insulin, which rises long before glucose does.

Can early insulin resistance be reversed?

Yes—when identified early, insulin resistance is highly reversible with physician-guided nutrition, lifestyle changes, and medication when appropriate.

When should I see a doctor for insulin resistance?

If you have persistent weight gain, fatigue, cravings, or trouble losing weight—even with normal glucose—or a history of diabetes, PCOS, or perimenopause, medical evaluation is warranted.

Medical Disclaimer:

The information provided in this blog is for educational and informational purposes only and is not intended as medical advice. It should not be used to diagnose, treat, or substitute professional medical advice from a qualified healthcare provider. Always consult with a qualified healthcare professional regarding any medical concerns or conditions.