Insulin Resistance: Early Signs, Causes and What to Do Next

Medically reviewed by Meg LaFerriere, APRN · Regulate Rx, Lee’s Summit, MO

Insulin resistance rarely announces itself. It tends to show up as a slow drift: a bit more weight at the waist, an afternoon crash, a lab value that’s creeping up.

What is insulin resistance, in plain English?

Insulin is the hormone that moves sugar from your blood into your muscles, liver and fat cells for energy. When those cells stop responding well, your pancreas pushes out more insulin to get the same job done.

For a while, that extra insulin keeps blood sugar in a normal range. That’s why insulin resistance can go unnoticed for years. Over time, the system can fall behind, and blood sugar starts to rise into the prediabetes or type 2 diabetes range.

The CDC estimates that more than 1 in 3 US adults has prediabetes, and most don’t know it. Insulin resistance is usually part of that story.

What are the early signs of insulin resistance?

Many people feel nothing at all. When there are clues, they often look like ordinary life, which is why they’re easy to brush off.

• Weight gain that settles around the waist, even if your weight overall hasn’t changed much
• Feeling sleepy or foggy after carb-heavy meals
• Strong cravings for sweets or starches, or feeling hungry soon after eating
• Darker, velvety skin in body folds such as the neck or armpits (acanthosis nigricans)
• New skin tags, especially on the neck
• Higher blood pressure or triglycerides, or low HDL cholesterol on routine labs
• Irregular cycles or excess hair growth in women, which can point to PMOS (formerly PCOS)

None of these signs proves insulin resistance on its own. They’re reasons to ask a few good questions and look at the numbers.

Which labs help check for insulin resistance?

There isn’t one perfect test, so clinicians usually look at a few markers together, along with your history and waist size.

Lab	What it shows
Fasting glucose	Blood sugar after an overnight fast; 100–125 mg/dL is considered the prediabetes range
Hemoglobin A1C	Average blood sugar over about three months; 5.7–6.4% is considered prediabetes
Fasting insulin	How hard your body is working to keep glucose normal; not standardized, but useful for trends
Lipid panel	High triglycerides and low HDL often travel with insulin resistance

Waist size matters too. The National Heart, Lung, and Blood Institute flags a waist over 35 inches for women and over 40 inches for men as a sign of higher metabolic risk.

What causes insulin resistance?

It’s usually a mix of genes and daily life. Family history, extra visceral fat (the deep belly fat around your organs), low muscle mass, inactivity, poor sleep and chronic stress all play a part.

Hormones matter as well. Shifts in estrogen during perimenopause and menopause, low testosterone in men, PMOS in women and some medications, such as steroids, can all make insulin work less smoothly. That’s one reason metabolic health and hormone health are so closely linked.

How can you improve insulin sensitivity?

The good news is that insulin resistance responds well to steady, realistic changes. You don’t need perfection to see your numbers move.

1. Build muscle. Muscle is one of the main places your body stores glucose. Strength training two or more days a week helps.
2. Walk after meals. Even 10 to 15 minutes can blunt the post-meal blood sugar rise.
3. Anchor meals with protein and fiber. They slow digestion and help with cravings.
4. Protect your sleep. Short sleep makes insulin work less well, even in healthy people.
5. Look at alcohol and sugary drinks. Liquid sugar and regular drinking both add up fast.

If hormones are part of the picture, addressing them alongside these habits can help. Our women’s hormone program and men’s hormone program both start with labs and a full review of your history.

Catching insulin resistance early

Insulin resistance often shows up quietly: cravings, energy crashes, weight around the middle or a slightly high fasting glucose. Lots of people in Lee’s Summit go years without connecting the dots. A consultation and lab panel can show you where you stand, and our women’s program covers PMOS-related insulin resistance too.

Frequently asked questions

Can you have insulin resistance at a normal weight?

Yes. Some people carry more visceral fat or have less muscle even at a normal weight, and genetics play a role. That’s why labs and waist size can be more useful than the number on the scale.

Is insulin resistance reversible?

For many people, insulin sensitivity improves a lot with more muscle, better sleep, more movement and changes to how they eat. Some people also need medication. Your clinician can track your labs over time to see what’s working.

How often should I get my blood sugar checked?

That depends on your age, weight and risk factors. Many adults get screened every few years, and people with prediabetes are usually checked at least once a year. Ask your clinician what makes sense for you.

Sources: CDC (National Diabetes Prevention Program); American Diabetes Association Standards of Care; National Heart, Lung, and Blood Institute; Cleveland Clinic; Mayo Clinic; NIH/MedlinePlus

This article is for general education and isn’t medical advice. Treatments aren’t right for everyone, and results vary. Our practitioner reviews your health history before any treatment.