Insulin Resistance: Symptoms, Causes, and How to Improve It
You eat reasonably well. You try to stay active. Maybe you're even working hard to lose weight.
But the scale isn't moving the way you expect. You're tired more often. You seem to gain weight around your middle. Or your blood sugar numbers aren't quite where you'd like them to be.
Could insulin resistance be part of the picture?
Insulin resistance is common and can develop before someone is diagnosed with prediabetes or type 2 diabetes. Understanding it early can help you take action before blood sugar levels become a bigger problem.
What Is Insulin Resistance?
Insulin is a hormone made by your pancreas. One of its main jobs is helping glucose move from your bloodstream into your cells, where it can be used for energy.
With insulin resistance, cells in your muscles, fat, and liver don't respond to insulin as effectively as they should.
Your pancreas may compensate by producing more insulin. For a while, blood sugar can remain within a normal range. But over time, if the body can't keep up, blood glucose levels can rise and lead to prediabetes and eventually type 2 diabetes.
What Are the Symptoms of Insulin Resistance?
Here's the tricky part:
Insulin resistance often doesn't cause noticeable symptoms.
Many people can have insulin resistance or prediabetes without knowing it. That's why routine health evaluations and blood sugar testing can be important, especially when someone has risk factors.
Some possible clues may include:
Difficulty losing weight or changes in body weight
Increased waist size or abdominal weight gain
Fatigue
Increased hunger
Darkened skin around the neck, armpits, or other areas
Skin tags
Elevated blood sugar or A1C
However, these signs don't automatically mean someone has insulin resistance. They can have many other causes.
What Causes Insulin Resistance?
There isn't one single cause.
Several factors can increase the risk, including:
Excess body weight, particularly around the abdomen
Physical inactivity
Family history of diabetes
Getting older
A history of gestational diabetes
Polycystic ovary syndrome (PCOS)
Certain medications
Other health conditions
Genetics and other factors also play a role, which means insulin resistance isn't simply a matter of willpower or "eating too much sugar."
Can Insulin Resistance Cause Weight Gain?
Insulin resistance and weight gain can be closely connected.
Insulin resistance can contribute to metabolic changes that make weight management more difficult, while excess body fat can also worsen insulin resistance.
This can create a frustrating cycle.
That's why simply telling someone to "eat less and exercise more" may not address the whole picture.
Looking at blood sugar, insulin function, body composition, activity, nutrition, sleep, and other health factors can provide a more complete understanding of metabolic health.
How Do You Test for Insulin Resistance?
There isn't one standard test that doctors routinely use to directly diagnose insulin resistance. Instead, healthcare professionals often evaluate blood glucose and related metabolic markers.
Testing may include:
A1C — reflects average blood glucose over approximately the past three months
Fasting blood glucose
Oral glucose tolerance testing, when appropriate
Cholesterol and triglyceride testing
For example, NIDDK identifies an A1C of 5.7% to 6.4% or fasting glucose of 100 to 125 mg/dL as ranges used to diagnose prediabetes.
Your healthcare provider can determine which tests are appropriate based on your individual risk factors and health history.
Can Insulin Resistance Be Improved?
In many cases, yes.
Lifestyle changes can help improve insulin sensitivity and reduce the risk of progressing to type 2 diabetes.
Helpful steps may include:
Eating a balanced diet.
Focus on nutrient-dense foods and a sustainable eating pattern that supports healthy blood sugar levels.
Moving your body regularly.
Physical activity helps your muscles use glucose and can improve insulin sensitivity.
Managing weight when appropriate.
For people with overweight or obesity, even modest weight loss can improve metabolic health. NIDDK notes that losing about 5% to 7% of starting body weight helped reduce diabetes risk in people at high risk in the Diabetes Prevention Program.
Prioritizing sleep.
Getting enough sleep is also part of maintaining metabolic health.
And for some people, medication may be appropriate as part of a broader treatment plan.
Don't Wait for Diabetes to Become the Warning Sign
Insulin resistance can develop quietly.
You don't necessarily need to wait until your blood sugar is high or you're diagnosed with diabetes before paying attention to your metabolic health.
If you're struggling with weight, energy, blood sugar, or other changes that don't seem to have a clear explanation, it may be worth looking beyond the symptoms.
At Hormone Balance Center, Dr. Roger Spahr takes a functional and individualized approach to health, looking at the bigger picture rather than focusing on a single number or symptom.
Your metabolism is telling you something. Are you listening?
If you're concerned about insulin resistance, prediabetes, or your metabolic health, talk with a qualified healthcare professional about appropriate testing and next steps.
Learn more about functional health and hormone balance at Hormone Balance Center.
📍 9748 Lantern Rd., Fishers, IN 46037
📞 +1 (317) 606-8640
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