If you’ve recently had bloodwork that raised concerns about your blood sugar, or if a doctor has mentioned prediabetes or insulin resistance, you may be trying to understand what those terms actually mean—and how worried you should be. The distinction between insulin resistance and diabetes is important, not just as a label but as a practical guide for what to do next. These are different points on the same metabolic continuum, and understanding where you fall on that spectrum determines what kind of intervention is most likely to help.
People often hear ‘insulin resistance’ and either dismiss it as a vague warning sign or assume it’s the same as diabetes. Neither is quite right. Insulin resistance is a real metabolic condition with meaningful health consequences—it doesn’t require a diabetes diagnosis for it to be worth treating. At the same time, insulin resistance is often reversible, or at least significantly manageable, with the right interventions. Many people who receive this information from their doctor don’t know what to do with it, in part because conventional primary care visits don’t always allow time to explain the full picture.
At SustainMD, Dr. Allison Barbee, MD, provides the depth of evaluation and education that helps patients actually understand their metabolic health—not just receive a number on a lab report. Her board certification in both internal medicine and obesity medicine positions her to evaluate the full spectrum from early insulin resistance through metabolic syndrome and diabetes management, and to build individualized treatment plans at each stage. SustainMD’s telehealth model makes this level of metabolic care accessible to patients in North Carolina, California, Florida, and Maine.
What Is Insulin Resistance?
Insulin is a hormone produced by the pancreas that enables cells throughout the body—in the muscles, liver, and fat tissue—to absorb glucose from the bloodstream and use it for energy. In a state of normal insulin sensitivity, a small amount of insulin is all that’s needed to move glucose into cells efficiently.
Insulin resistance describes a condition in which cells have become less responsive to insulin’s signal. The cells don’t take up glucose as readily, so blood glucose levels begin to rise. In response, the pancreas produces more insulin to compensate, trying to force the same result. For a while, this compensation works—blood glucose stays in a normal or near-normal range, even though insulin levels are significantly elevated. This is why insulin resistance can be present for years before standard blood glucose testing picks it up.
The elevated insulin itself is not benign. High circulating insulin promotes fat storage (particularly abdominal fat), drives cravings for carbohydrates and sugar, contributes to hormonal imbalances including in PCOS, and creates an inflammatory environment that damages blood vessels over time. Insulin resistance is not a pre-condition you can ignore while waiting for it to become ‘real’ disease—it is a metabolic condition with real consequences at every stage.
SustainMD’s Insulin Resistance Boot Camp is built specifically around identifying and treating insulin resistance at every stage, with a personalized program that addresses the metabolic root causes driving it.
What Is Prediabetes?
Prediabetes is a defined metabolic stage characterized by blood glucose levels that are higher than normal but not yet high enough to meet the diagnostic criteria for type 2 diabetes. It typically represents a period when insulin resistance has progressed to the point where the pancreas can no longer fully compensate—blood glucose begins to rise despite elevated insulin production.
By conventional definitions, prediabetes is diagnosed when fasting blood glucose falls between 100 and 125 mg/dL, or when hemoglobin A1C (a measure of average blood sugar over three months) is between 5.7 and 6.4 percent. A two-hour oral glucose tolerance test showing a value between 140 and 199 mg/dL also indicates prediabetes. These are thresholds where significant interventions can still meaningfully alter the course of the disease.
Research suggests that about 70 to 80 percent of people with prediabetes will develop type 2 diabetes at some point if the underlying conditions driving it are not addressed. This is not inevitable—it’s a trajectory that can be changed with the right treatment. But prediabetes is often undertreated or even unmentioned, because many physicians don’t know what to recommend beyond ‘watch your diet and exercise more,’ which rarely provides enough structure to produce meaningful change.
What Is Type 2 Diabetes?
Type 2 diabetes is diagnosed when blood glucose levels consistently exceed the thresholds that define prediabetes: fasting glucose at or above 126 mg/dL on two separate occasions, A1C at or above 6.5 percent, or a two-hour glucose tolerance test result of 200 mg/dL or higher. At this stage, the pancreatic beta cells that produce insulin have been under chronic overwork and are beginning to lose their ability to compensate. Insulin resistance remains, but now insulin production itself is impaired.
Type 2 diabetes is a serious chronic condition with significant complications when poorly controlled—including damage to the kidneys, eyes, nerves, and cardiovascular system. It requires active management, typically including lifestyle modification, medication, and regular monitoring. However, it’s important to know that even at the stage of type 2 diabetes, meaningful metabolic improvement is possible. Some patients who achieve significant weight loss and metabolic improvement experience remission—A1C returning to the non-diabetic range—though this is not universal and does not mean the underlying metabolic vulnerability has disappeared.
For patients managing weight alongside type 2 diabetes, SustainMD’s virtual weight loss for diabetes program integrates blood sugar management with physician-supervised weight loss for a comprehensive approach.
Key Differences Between Insulin Resistance and Diabetes
- Blood glucose levels: In insulin resistance (without prediabetes), blood glucose may be entirely normal on standard testing—the problem is most visible in elevated fasting insulin or HOMA-IR. In prediabetes, blood glucose is elevated but below diabetic thresholds. In type 2 diabetes, blood glucose consistently exceeds diagnostic cutoffs and requires active management.
- Insulin levels: Insulin resistance is characterized by high insulin production as the pancreas compensates. In later-stage type 2 diabetes, insulin levels may actually decline as beta cell function deteriorates, requiring external insulin therapy in some patients. The progression from high insulin to low insulin is one of the key changes as metabolic disease advances.
- Reversibility: Insulin resistance, and to a meaningful degree prediabetes, can often be significantly improved or reversed with appropriate treatment. Type 2 diabetes can be managed and sometimes brought into remission, but the underlying metabolic vulnerability remains and requires ongoing attention to prevent relapse.
- Symptoms: Insulin resistance in isolation is often symptom-free on standard testing, though patients may notice fatigue, carbohydrate cravings, difficulty losing weight, and abdominal weight gain. As the condition progresses into prediabetes and diabetes, more pronounced symptoms may develop—including increased thirst, frequent urination, blurred vision, and slow wound healing.
When to Seek Medical Evaluation
If you have any of the following—unexplained weight gain particularly around the abdomen, persistent fatigue, strong carbohydrate cravings, a family history of type 2 diabetes, PCOS, high blood pressure, or elevated triglycerides—metabolic screening beyond a standard fasting glucose test is warranted. Many conventional lab panels miss early insulin resistance because they don’t test fasting insulin or HOMA-IR. Asking your physician for a more comprehensive metabolic panel can identify dysfunction years before standard screening catches it.
At SustainMD, the evaluation process is built to identify metabolic dysfunction at whatever stage it exists—not just when it becomes diagnosable as diabetes. The goal is to intervene early, when the metabolic system is still most responsive to treatment and the potential for meaningful reversal or prevention is highest.
Frequently Asked Questions
1. Can insulin resistance turn into diabetes?
Yes, if the underlying metabolic drivers are not addressed. Research suggests that approximately 70 to 80 percent of individuals with prediabetes will develop type 2 diabetes over time without intervention. However, this progression is not inevitable—appropriate treatment at the insulin resistance and prediabetes stages can significantly reduce this risk.
2. Can insulin resistance be reversed?
In many cases, yes. Insulin resistance is often responsive to dietary changes that reduce the glycemic load of the diet, weight loss (particularly reduction of visceral fat), regular physical activity, improved sleep, and when appropriate, medications. The degree of improvement depends on how long it has been present and the individual’s metabolic profile.
3. What’s the best test for insulin resistance?
Standard fasting glucose and A1C tests can miss early insulin resistance. More sensitive tests include fasting insulin, HOMA-IR (calculated from fasting glucose and insulin), and a two-hour oral glucose tolerance test with insulin measurement. Your physician can determine which tests are most appropriate based on your symptom picture.
4. Do I need medication for insulin resistance?
Not always. Many patients with insulin resistance see meaningful improvement through dietary changes, physical activity, and weight loss. When these approaches are insufficient, medications like metformin or GLP-1 receptor agonists may be appropriate. The decision depends on the severity of insulin resistance, other health conditions, and patient goals.
5. What does insulin resistance feel like?
Insulin resistance often causes no obvious symptoms early on. As it progresses, common experiences include persistent fatigue, intense cravings for sugar and carbohydrates, difficulty losing weight despite effort, increased abdominal fat, brain fog, and energy crashes after meals. These are not diagnostic on their own, but they’re worth discussing with a physician.
6. Is prediabetes the same as insulin resistance?
Not exactly. Insulin resistance is a metabolic dysfunction that can exist before prediabetes develops. Prediabetes is a defined diagnostic stage where blood glucose has risen above normal ranges as a result of worsening insulin resistance. You can have significant insulin resistance with normal blood glucose—which is one reason early metabolic screening is valuable.
7. Can you have insulin resistance without being overweight?
Yes. While excess body fat—particularly visceral fat—is a common driver of insulin resistance, it can develop in people with normal body weight due to genetic factors, dietary patterns, physical inactivity, sleep disruption, or hormonal conditions. PCOS, for example, is associated with insulin resistance even in women who aren’t overweight.
8. How long does it take to reverse insulin resistance?
With consistent intervention, many patients begin to see improvements in insulin sensitivity within four to twelve weeks. More complete reversal—where lab markers normalize—may take several months to a year, depending on the severity of the condition and the comprehensiveness of treatment. Ongoing maintenance is typically needed to sustain improvements.
9. What foods are worst for insulin resistance?
Foods that cause rapid blood sugar spikes tend to worsen insulin resistance most directly: refined grains (white bread, white rice, pastries), added sugars, sugar-sweetened beverages, and processed snack foods. Ultra-processed foods also contribute to systemic inflammation, which compounds insulin resistance. A physician or dietitian can provide personalized guidance based on your specific metabolic picture.
10. Does SustainMD treat patients with both insulin resistance and diabetes?
Yes. SustainMD’s programs address the full metabolic spectrum from early insulin resistance through prediabetes and type 2 diabetes management. The treatment approach is individualized based on where a patient falls on this spectrum and what other metabolic factors are present. Care is delivered via telehealth in North Carolina, California, Florida, and Maine.
Disclaimer
This content is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making decisions about your health. Treatment recommendations vary based on individual circumstances, medical history, and clinical evaluation.
