What This Guide Covers
Insulin resistance (IR) is the root driver of Type 2 diabetes, PCOS, metabolic syndrome, and NAFLD. This is not a textbook overview — it is a clinician-to-clinician action guide. Use it at the bedside or in the clinic.
Immediate Assessment
Who to Screen
BMI above 25 (or waist above 90 cm in South Asian men, above 80 cm in women)Acanthosis nigricans on neck, axilla, or groinPCOS, irregular cycles, or hyperandrogenismFamily history of T2DM in first-degree relativesGestational diabetes historyFatigue, brain fog, or post-meal energy crashesTriglycerides above 150 mg/dL or HDL below 40 (men) / below 50 (women)First-Line Labs (Order All at Once)
Fasting insulin + fasting glucose — calculate HOMA-IRHbA1cFasting lipid panel (TG:HDL ratio above 3.5 is a strong IR marker)Liver enzymes (ALT/AST) — screen for NAFLDOGTT if fasting glucose is borderline (100-125 mg/dL)In women: LH:FSH ratio, free testosterone, DHEAS if PCOS suspectedInterpreting HOMA-IR
Formula: (Fasting Insulin x Fasting Glucose) divided by 405Normal: below 1.9Early IR: 1.9-2.9Significant IR: above 2.9Severe IR: above 5.0Stepwise Management
Step 1 — Lifestyle First (Non-Negotiable)
Caloric deficit:: 500-750 kcal/day below maintenance. Even 5-7% weight loss improves IR by 30-50%.Carbohydrate quality:: Switch to low-glycemic index carbs. Eliminate refined flour (maida), white rice in large portions, sugary drinks.Protein target:: 1.2-1.6 g/kg/day. Protein blunts postprandial insulin spikes.Resistance training:: 2-3 sessions/week. Muscle is the primary glucose sink — building it is therapeutic.Walking after meals:: 10-15 minutes post-meal reduces postprandial glucose by 20-30%.Sleep:: Less than 6 hours/night worsens IR acutely. Target 7-8 hours.Stress reduction:: Cortisol directly antagonizes insulin. Address if chronic stress is present.Step 2 — Add Metformin (If Lifestyle Alone Insufficient After 3 Months)
Start: 500 mg with dinner for 1 weekTitrate: 500 mg twice daily (with meals) for 2 weeksTarget dose: 1000 mg twice daily (with breakfast and dinner)Maximum: 2550 mg/day (rarely needed)Take with food — reduces GI side effects significantlyCheck eGFR before starting; hold if eGFR below 30Step 3 — Add GLP-1 Receptor Agonist (If BMI above 30 or Inadequate Response)
Semaglutide (Ozempic):: 0.25 mg SC weekly x 4 weeks, then 0.5 mg weekly, up to 1 mg weeklyLiraglutide (Victoza):: 0.6 mg SC daily x 1 week, then 1.2 mg, then 1.8 mgExcellent for IR + weight loss + cardiovascular protectionNausea is common initially — counsel patients upfrontStep 4 — Consider SGLT-2 Inhibitor (Especially With Hypertension or NAFLD)
Empagliflozin:: 10 mg once daily (can increase to 25 mg)Dapagliflozin:: 10 mg once dailyReduces hepatic fat, blood pressure, and cardiovascular riskAvoid if eGFR below 45 or recurrent UTIsStep 5 — Inositol (For PCOS-Related IR)
Myo-inositol:: 2 g twice daily (with meals)D-chiro-inositol:: 50-100 mg/day (or combined 40:1 ratio with myo-inositol)Evidence-based for PCOS IR; improves ovulation and androgen levelsSafe, well-tolerated, available OTCDrug Doses at a Glance
Metformin
Starting: 500 mg once daily with dinnerMaintenance: 500-1000 mg twice daily with mealsMaximum: 2550 mg/day in divided dosesContraindicated: eGFR below 30, active liver disease, contrast dye proceduresSemaglutide (Ozempic)
Week 1-4: 0.25 mg SC weeklyWeek 5-8: 0.5 mg SC weeklyWeek 9+: 1 mg SC weekly (if needed)Injection sites: abdomen, thigh, or upper arm — rotateEmpagliflozin
Standard: 10 mg once daily (morning)Uptitrate: 25 mg once daily if toleratedHold before surgery or prolonged fasting (DKA risk)Myo-Inositol (PCOS)
2 g twice daily with mealsCombine with 200 mcg folic acid for PCOS fertility supportRed Flags — Act Immediately
Fasting glucose above 200 mg/dL or HbA1c above 9%:: Do not manage as IR alone — initiate diabetes treatmentALT above 3x upper limit of normal:: Evaluate for NASH/cirrhosis before starting hepatotoxic agentsSudden weight gain + hypertension + purple striae:: Rule out Cushing syndrome before labeling as IRAcanthosis nigricans in a lean patient:: Consider type B IR (autoimmune) or genetic lipodystrophySevere hypertriglyceridemia (above 500 mg/dL):: Pancreatitis risk — address urgently with fibrates + dietary fat restrictionPolydipsia + polyuria + weight loss:: Likely progressed to T2DM or LADA — check C-peptide and GAD antibodiesMetformin + contrast dye:: Hold metformin 48 hours before and after IV contrastCommon Mistakes to Avoid
Diagnosing IR by fasting glucose alone:: Fasting glucose can be normal while HOMA-IR is already elevated. Always check fasting insulin.Prescribing metformin without titrating:: Starting at 1000 mg immediately causes GI intolerance and poor adherence. Always titrate up slowly.Ignoring sleep and stress:: These are not soft factors — cortisol and sleep deprivation are mechanistically insulin-antagonizing. Address them clinically.Treating PCOS IR with metformin alone:: Inositol has comparable or superior evidence for PCOS-specific IR. Use it.Stopping metformin when glucose normalizes:: IR is a chronic condition. Stopping prematurely leads to relapse. Reassess at 6-12 months.Not checking TG:HDL ratio:: This is the most underused IR marker in clinical practice. A ratio above 3.5 is highly predictive of IR even when glucose is normal.Overlooking NAFLD:: IR and fatty liver are inseparable. Always check liver enzymes and consider ultrasound in high-risk patients.Recommending low-fat diets:: Low-fat diets often replace fat with refined carbs — worsening IR. Recommend low-glycemic, moderate-fat diets instead.Get Your Personalized Diet Plan
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