Your Watch May Spot Insulin Resistance Before Your Blood Work Does

You just got the call from your doctor’s office: Your blood work looks great! Your cholesterol, A1C and fasting glucose are all in the healthy range. But your fitness tracker keeps sending you alerts. Your resting heart rate seems a little high. Your heart rate variability is on the lower side. And you can’t help wondering: Could my smart watch be picking up on something worth paying attention to?

It’s a great question—and the good news is, there’s a lot you can do. Sometimes routine blood work doesn’t tell the whole story, and early signs of insulin resistance can show up in subtle ways before anything looks “off” on paper. The even better news? Your wearable may actually be helping you catch these signals early, when lifestyle changes can make the biggest difference. We spoke with a top cardiologist about the gentle clues that sometimes point to insulin resistance—and the simple, feel-good steps you can take at home to support your health and energy every day.

What is insulin resistance?

“Insulin resistance—IR—is a condition in which the body’s cells, primarily in skeletal muscle, liver and adipose tissue [connective tissue] become less responsive to the hormone insulin,” saysKardie Tobb, DO, MS, FASPC, FACC, a board‑certified preventive cardiologist and the medical director for the Cone Health HeartCare Women’s Heart Health and Cardio-Obstetrics Clinic for insights.”

When our body’s cells respond normally, insulin helps glucose move into cells where it can be used for energy, but when cells become less sensitive to insulin, cells in the pancreas have to compensate by producing more insulin, explains Dr. Tobb. Over time, these higher insulin levels can contribute to plaque buildup in the arteries and trigger inflammation throughout the body, she adds.

New research on 3 sneaky insulin resistance symptoms

In a new Nature study, researchers examined data from 1,165 adults wearing Fitbit and Google Pixel Watch devices and found that people with higher resting heart rates, lower heart rate variability and fewer daily steps were more likely to be insulin resistant. Additionally, nearly 20 percent of participants with normal blood sugar levels were already insulin resistant, suggesting that wearable-tracked health metrics may help identify metabolic problems before type 2 diabetes is diagnosed.

So what exactly is your wearable picking up on? Dr. Tobb breaks down these three key metrics that may signal insulin resistance.

Elevated resting heart rate

If your resting heart rate has been consistently above 80 beats per minute for several weeks and you can’t pinpoint another obvious explanation (like a new medication or increased stress), Dr. Tobb says it’s worth having a conversation with your doctor about your metabolic health.

She explains that an overactive stress-response system can cause more fat and sugar to be released into the bloodstream, which could worsen insulin resistance.

Decreased heart rate variability

Heart rate variability refers to the time between our heartbeats and is reflective of the balance between our sympathetic nervous system, which controls our body’s fight-or-flight response, and our parasympathetic nervous system, which helps our body rest and recover, says Dr. Tobb. When these systems are in harmony, your HRV is healthy. When they’re out of balance, your HRV drops.

Dr. Tobb adds that a chronically low HRV demonstrates that our body is consistently in a fight-or-flight stress response, which can reduce the body’s ability to respond properly to insulin. Over time, low HRV is also linked to inflammation, both of which can contribute to insulin resistance, she says.

Lower step count

Insulin resistance doesn’t just start in one area of our body. It impacts multiple body systems, and Dr. Tobb says that a lack of physical activity is a key driver of insulin resistance in our skeletal muscles, which play a major role in helping the body process blood sugar. Why? She explains that muscle contractions that happen when we exercise activate pathways in our body that signal to our cells to remain sensitive to insulin, and when someone is sedentary, those pathways remain underactivated.

Do you need a wearable tech device like a smart watch to track insulin resistance?

Dr. Tobb says the Nature study is groundbreaking because it shows that wearable health tech can provide you with metabolic information that standard blood work might miss.

If you’d like to start using wearable health tech to monitor your metabolic health, you don’t need to break the bank to start. Health-tracking watches start around $30, making this technology accessible for most budgets. If you want more advanced features, devices like the Oura Ring retail for about $350.

That said, Dr. Tobb reminds us that wearable tech cannot diagnose insulin resistance. For an actual diagnosis, lab testing, including fasting insulin and glucose, is still needed. Physicians can also calculate a HOMA-IR score using those results, which can help identify insulin resistance even before it shows up on routine blood sugar tests, she adds.

How to improve insulin resistance

Whether you have a confirmed insulin resistance diagnosis or you’ve simply noticed some of these warning signs, Dr. Tobb has three simple strategies you can start using at home today to support your insulin sensitivity—with or without a smart watch. No prescription required.

Walk after meals

We get it, the last thing you probably feel like doing after a particularly indulgent meal is walking, but a gentle walk could make all the difference for your insulin health. Dr. Tobb suggests walking for 10 to 15 minutes after your big meals. She says walking helps muscles clear glucose from the bloodstream and lowers blood sugar spikes after eating, both of which can support insulin sensitivity.

Shift your meal order

When you sit down to eat a meal, you may be tempted to dive into your favorites like carbs, but switching things up a bit could better support your insulin sensitivity. Dr. Tobb recommends eating veggies and protein before carbs and prioritizing both protein and fiber over processed foods when eating. She says these simple meal swaps can slow how much sugar gets absorbed into our bloodstream when eating, lowering how much insulin our body uses.

Get more sleep

Sleep isn’t just important for our brain health. It also plays a key role in insulin resistance. Dr. Tobb says adequate sleep supports insulin sensitivity, while sleep deprivation can promote insulin resistance. One reason may be that poor sleep can increase stress hormones like cortisol, which can make it harder for the body to respond properly to insulin. She recommends aiming for seven to nine hours of good sleep a night.

The bottom line on insulin resistance

When it comes to health, some conditions make themselves known right away, while others quietly develop before leading to bigger problems. Insulin resistance falls into the second category, but when caught early, there are steps you can take to improve your insulin sensitivity and support your long-term health. Whether a wearable device raises concerns or your doctor identifies signs of metabolic dysfunction, small changes at home can make a meaningful difference.

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This story was originally published June 8, 2026 at 8:30 PM.