Insulin Resistance

A metabolic condition where cells stop responding to insulin, driving fat storage and blood sugar dysregulation.

Overview

Insulin resistance is the root metabolic dysfunction behind most chronic diseases of modern life — type 2 diabetes, cardiovascular disease, PCOS, non-alcoholic fatty liver disease, and potentially Alzheimer's. It typically develops over years or decades, driven by chronic carbohydrate overload, physical inactivity, poor sleep, and chronic stress. The key insight: by the time fasting glucose rises above "normal," insulin resistance has likely been present for 10+ years. Fasting insulin is the early warning signal most doctors miss.

Common Symptoms

Persistent fatigue, especially after meals

Increased hunger and carbohydrate cravings

Abdominal weight gain (visceral fat)

Difficulty losing weight despite effort

Brain fog and afternoon energy crashes

Darkened skin patches (acanthosis nigricans)

Skin tags

High blood pressure

Elevated triglycerides

Frequent urination and increased thirst (later stages)

Key Lab Markers

Fasting Insulin

Optimal: 2-8 uIU/mL

The most sensitive early marker. Standard labs often do not test this — you must request it specifically.

Fasting Glucose

Optimal: 70-90 mg/dL

Normal fasting glucose does not rule out insulin resistance — glucose rises late in the disease progression.

HbA1c

Optimal: 4.8-5.3%

Reflects 3-month average blood sugar. Under 5.7% is "normal" but optimal is below 5.3%.

HOMA-IR

Optimal: Below 1.5

Calculated from fasting insulin and glucose. Most useful single metric for insulin resistance.

Triglycerides

Optimal: Below 100 mg/dL

Elevated triglycerides are a hallmark of insulin resistance and metabolic dysfunction.

Triglyceride/HDL Ratio

Optimal: Below 1.5

Simple proxy for insulin resistance. Ratio above 3.0 strongly suggests metabolic dysfunction.

Common Causes

1.Chronic excess carbohydrate and sugar consumption
2.Physical inactivity — muscle is the largest glucose sink in the body
3.Visceral adiposity — belly fat produces inflammatory cytokines that worsen resistance
4.Chronic sleep deprivation (even 2-3 nights of poor sleep measurably increases insulin resistance)
5.Chronic stress and elevated cortisol
6.Genetic predisposition (family history of type 2 diabetes)
7.Medications (corticosteroids, antipsychotics, some beta-blockers)
8.Microbiome disruption and gut inflammation

Evidence-Based Management

1Reduce refined carbohydrates and sugar — prioritize protein, healthy fats, and fiber

2Resistance training — builds muscle (the body's largest glucose disposal system)

3Walking after meals — a 15-minute post-meal walk can reduce glucose spikes by 30%+

4Time-restricted eating — compressing the eating window improves insulin sensitivity

5Prioritize sleep — 7-9 hours of quality sleep is non-negotiable for insulin sensitivity

6Stress management — cortisol directly raises blood sugar and promotes insulin resistance

7Consider berberine — research shows comparable efficacy to metformin for blood sugar control

8Monitor with a CGM — continuous glucose monitors provide real-time feedback on food choices

Frequently Asked Questions

Can insulin resistance be reversed?

Yes. Insulin resistance is highly responsive to lifestyle intervention. Resistance training, dietary changes (reducing refined carbs, increasing protein), time-restricted eating, and weight loss can restore insulin sensitivity. Many people normalize their markers within 3-6 months.

Is insulin resistance the same as diabetes?

No. Insulin resistance is the precursor to type 2 diabetes. In insulin resistance, the pancreas compensates by producing extra insulin. Type 2 diabetes develops when the pancreas can no longer keep up. Catching and reversing insulin resistance prevents diabetes.

Why does my doctor not test fasting insulin?

Fasting insulin is not part of standard metabolic panels. Many physicians focus on fasting glucose and HbA1c, which rise much later in the disease progression. You may need to specifically request fasting insulin testing.