Insulin Resistance Symptoms: The Signs, the Tests, and Why Indians Should Look Closer

Dt. Trishala Goswami, MSc Clinical Nutritionist · Diabetes Educator · Certified Nutrigenomics Specialist · Last Updated: October 2026

Short answer: The most reliable insulin resistance symptoms are ones you can see or measure: a large waist (for South Asians, 90 cm or more in men and 80 cm or more in women), dark velvety skin on the neck or underarms (acanthosis nigricans), multiple skin tags, PCOS in women, and lab results such as high triglycerides, low HDL, or fasting glucose and HbA1c creeping upward. Tiredness after meals and sugar cravings are often mentioned but are not specific. Many people with insulin resistance have no symptoms at all, so a blood test is the only way to know.

That matters most for Indians, at home or abroad, because South Asians often develop insulin resistance at a weight that looks normal on a BMI chart. This guide covers each sign, how strong the evidence behind it is, and which tests to ask your doctor for.

What insulin resistance actually is

Insulin moves glucose from your blood into muscle, liver and fat cells. In insulin resistance, those cells respond less well, so the pancreas makes more insulin to keep blood sugar normal. For years this works: routine blood sugar looks fine while insulin runs high in the background. That is why the condition is so often silent.

Symptoms usually appear either as side effects of high insulin (skin changes, PCOS features) or later, when the pancreas can no longer keep up and blood sugar rises into the prediabetes range. Insulin resistance is a mechanism, not a diagnosis. Prediabetes and type 2 diabetes are diagnosed from blood sugar cut-offs, and insulin resistance usually comes first.

Why BMI misleads South Asians (the "thin-fat" pattern)

At the same BMI, South Asians tend to carry more body fat, more of it around the organs, and less muscle to absorb glucose than white Europeans. Yajnik and Yudkin called this the "Y-Y paradox" in The Lancet (2004). In everyday language, it is being "thin-fat".

• A WHO expert consultation (2004) found that a substantial share of Asian people are at high risk of type 2 diabetes and heart disease at BMIs below 25, and proposed lower action points of 23 and 27.5 kg/m².
• A study of almost 1.5 million adults in England (Caleyachetty et al., 2021) found South Asians reached the same type 2 diabetes risk at a BMI of 23.9 that white adults reached at 30.
• The American Diabetes Association (ADA) uses a BMI of 23, not 25, as the screening threshold for adults of Asian ancestry.
• In India, the ICMR-INDIAB study (Anjana et al., 2023) found abdominal obesity in 39.5% of adults and prediabetes in 15.3%.

So for an NRI in Toronto, London or New Jersey, a "healthy BMI" on your annual physical does not rule out insulin resistance. Your waist, family history and blood tests tell you more. For the full story, read why Indians get diabetes at a lower weight.

Insulin resistance symptoms at a glance

Not every sign on the internet deserves equal weight. Here is how the common ones stack up.

Signs you can see

Waist size

Your waist is the most useful home check. The International Diabetes Federation (IDF) definition of metabolic syndrome uses ethnicity-specific waist cut-offs (Zimmet, Shaw and Alberti, Medical Journal of Australia, 2005):

Many Western symptom pages quote 40 inches for men and 35 inches for women. Those numbers were not built for South Asian bodies: an Indian man with a 37 inch waist is already over the IDF South Asian line. To measure, stand relaxed, breathe out gently, and wrap a tape around your bare abdomen at navel level without sucking in.

Acanthosis nigricans

This is dark, thickened, velvety skin in body folds, most often at the back of the neck. Many people mistake it for dirt or a tan and scrub harder, which does not help.

Its link with high insulin is well established. Hud and colleagues (1992, Archives of Dermatology) found it in 74% of 34 adults at an obesity clinic, and those with it had markedly higher fasting insulin. Closer to home, a study of 2,957 adults aged 35 to 64 in urban Sri Lanka (Dassanayake et al., 2011) found it in 17.4%. It strongly predicted metabolic syndrome but picked up fewer than a third of the people who had it. So it is a useful flag when present, and tells you little when absent.

Skin tags

In a Brazilian study of 98 adults with more than five skin tags and 103 without (Tamega et al., 2010), multiple skin tags were linked with insulin resistance after adjusting for other risk factors. The study was small and cross-sectional, and skin tags also come from friction, age and genetics. Treat several skin tags as a reason to get tested, not as proof.

Signs you may feel (and why they are less reliable)

Popular lists include fatigue after meals, sugar cravings, hunger soon after a carb-heavy meal and trouble concentrating. These experiences are real and may fit with large swings in blood sugar and insulin after meals, but we found no good-quality studies showing they reliably identify insulin resistance. They also have many other causes: short sleep, low iron or B12, thyroid problems, stress, or simply a big meal. Almost everyone slumps after rice, rotis and dessert at a wedding lunch.

Use these feelings as a nudge, not a verdict. If they come with a large waist, a family history of diabetes or any visible sign above, get tested.

Insulin resistance symptoms in women

For women, the biggest clue is often PCOS. The 2023 International Evidence-based Guideline for PCOS (Teede et al.) recognises insulin resistance as a key feature of the condition, while noting that routinely available measures of it are inaccurate and not currently recommended in clinical practice. Signs worth noticing:

• Irregular or missed periods (in adults, cycles shorter than 21 days or longer than 35 days, or fewer than eight a year)
• Excess hair on the face, chin, chest or abdomen
• Persistent adult acne
• Thinning scalp hair
• Weight that settles around the middle

Lean women with PCOS can be insulin resistant too. Our guide to PCOS and insulin resistance covers the link in depth, and the free PCOS symptom score can help you decide whether to raise it with your gynaecologist.

Gestational diabetes is another major signal. A meta-analysis of 20 studies (Vounzoulaki et al., 2020, BMJ) found women who had it were almost 10 times more likely to develop type 2 diabetes later. The ADA advises lifelong testing at least every three years afterwards.

Lab signs: what your blood tests can show

This is where insulin resistance symptoms become something you can track.

Glucose and HbA1c cut-offs are from the ADA Standards of Care 2026, and a diabetes diagnosis usually needs a repeat test to confirm it.

Fasting insulin is the most direct of these tests, but it is not standardised. An ADA workgroup (Marcovina et al., 2007) found that results varied between commercial insulin tests by 12% to 66%. Compare your results over time at the same lab rather than chasing a magic number. HOMA-IR (Matthews et al., 1985, Diabetologia) combines fasting glucose and insulin into one score. A single reading is imprecise, but it shows your direction. Cut-offs differ between populations, so see our HOMA-IR guide with Indian cut-offs to read your result.

Who is at higher risk

You are more likely to have insulin resistance, and to benefit from testing, if any of these apply:

• Family history: a parent, brother or sister with type 2 diabetes.
• South Asian ancestry: Indian, Pakistani, Bangladeshi, Sri Lankan or Nepali heritage, wherever you live now.
• A large waist: 90 cm or more for men, 80 cm or more for women.
• PCOS or a history of gestational diabetes.
• High blood pressure, low HDL, high triglycerides, or fatty liver on a scan.
• Short sleep: in a classic experiment (Spiegel et al., 1999, The Lancet), 11 healthy young men allowed only 4 hours in bed for six nights had lower glucose tolerance than after six nights of recovery sleep.
• Inactivity: long desk hours, little walking, no strength training.

The ADA recommends screening adults of Asian ancestry with a BMI of 23 or more who have one of these risk factors, and testing everyone from age 35.

How to get tested

Ask your doctor (or, in India, a reputable diagnostic lab) for:

1. Fasting plasma glucose
2. HbA1c
3. Lipid profile (total cholesterol, LDL, HDL, triglycerides)
4. Fasting insulin, from the same blood draw as the fasting glucose so HOMA-IR can be calculated

Fast for at least 8 hours (most labs ask for 8 to 12), drinking only water. Your doctor may add an oral glucose tolerance test (OGTT), liver tests or an ultrasound.

Then enter your fasting glucose and insulin into our free HOMA-IR calculator. It accepts glucose in mg/dL (India, US) or mmol/L (UK, Canada, Australia), which helps when reports come from different countries. The HbA1c converter turns your HbA1c percentage into an estimated average blood glucose in both mg/dL and mmol/L. If results are normal but you have risk factors, the ADA suggests retesting at least every three years, or yearly once you are in the prediabetes range.

What helps

Insulin resistance responds well to everyday habits:

• Protein at every meal: dal, paneer, curd, eggs, chicken, fish, sprouts or tofu, so the plate is not mostly roti and rice.
• Fewer refined carbs and sugary drinks: sweet chai, packaged juice, cold drinks and biscuits are the easiest first cuts. Keep whole grains and millets in sensible portions.
• A walk after meals: a meta-analysis of seven trials (Buffey et al., 2022, Sports Medicine) found that breaking up sitting with light walking lowered glucose and insulin after meals. A 10 to 15 minute walk after lunch and dinner is an easy start. See our guide to walking after meals.
• Strength training two or three times a week: muscle is a major destination for glucose after meals, which matters most for thin-fat bodies.
• At least seven hours of sleep.
• A smaller waist: modest weight loss often improves insulin sensitivity in people carrying weight around the middle. For lean people, adding muscle may matter more.

For day-by-day Indian meals, see the 7-day insulin resistance diet plan. If your numbers are already in the prediabetes range, the prediabetes reversal protocol sets out a phased six-month plan.

When to see a doctor

See your doctor if you notice any of the visible signs above, have two or more risk factors, or are 35 or older and have never had fasting glucose and HbA1c checked. With South Asian heritage and a family history of diabetes, ask sooner.

Go promptly if you have symptoms of high blood sugar, which the NHS lists as:

• Feeling very thirsty all the time
• Peeing more than usual
• Losing weight without trying
• Blurred vision
• Feeling very tired
• Slow-healing cuts, or repeated thrush or genital itching

These suggest blood sugar may already be in the diabetes range and need medical assessment, not a diet change alone. If you take medicine for blood sugar, blood pressure or PCOS, don't change it without your doctor.

References

1. American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1):S27 to S49. doi:10.2337/dc26-S002
2. WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies. The Lancet. 2004;363:157 to 163. doi:10.1016/S0140-6736(03)15268-3
3. Zimmet PZ, Shaw JE, Alberti KGMM. Mainstreaming the metabolic syndrome: a definitive definition (IDF consensus criteria). Medical Journal of Australia. 2005;183(4):175 to 176.
4. Matthews DR, Hosker JP, Rudenski AS, et al. Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia. 1985;28:412 to 419. doi:10.1007/BF00280883
5. Yajnik CS, Yudkin JS. The Y-Y paradox. The Lancet. 2004;363:163. doi:10.1016/S0140-6736(03)15269-5
6. Caleyachetty R, Barber TM, Mohammed NI, et al. Ethnicity-specific BMI cutoffs for obesity based on type 2 diabetes risk in England: a population-based cohort study. Lancet Diabetes & Endocrinology. 2021;9(7):419 to 426. doi:10.1016/S2213-8587(21)00088-7
7. Anjana RM, Unnikrishnan R, Deepa M, et al. Metabolic non-communicable disease health report of India: the ICMR-INDIAB national cross-sectional study (ICMR-INDIAB-17). Lancet Diabetes & Endocrinology. 2023;11(7):474 to 489. doi:10.1016/S2213-8587(23)00119-5
8. Hud JA, Cohen JB, Wagner JM, Cruz PD. Prevalence and significance of acanthosis nigricans in an adult obese population. Archives of Dermatology. 1992;128(7):941 to 944.
9. Dassanayake AS, Kasturiratne A, Niriella MA, et al. Prevalence of acanthosis nigricans in an urban population in Sri Lanka and its utility to detect metabolic syndrome. BMC Research Notes. 2011;4:25. doi:10.1186/1756-0500-4-25
10. Tamega AA, Aranha AMP, Guiotoku MM, Miot LDB, Miot HA. Association between skin tags and insulin resistance. Anais Brasileiros de Dermatologia. 2010;85(1):25 to 31. doi:10.1590/S0365-05962010000100003
11. Teede HJ, Tay CT, Laven JJE, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Journal of Clinical Endocrinology & Metabolism. 2023;108(10):2447 to 2469.
12. Vounzoulaki E, Khunti K, Abner SC, et al. Progression to type 2 diabetes in women with a known history of gestational diabetes: systematic review and meta-analysis. BMJ. 2020;369:m1361. doi:10.1136/bmj.m1361
13. Marcovina S, Bowsher RR, Miller WG, et al. Standardization of insulin immunoassays: report of the American Diabetes Association Workgroup. Clinical Chemistry. 2007;53(4):711 to 716. doi:10.1373/clinchem.2006.082214
14. Spiegel K, Leproult R, Van Cauter E. Impact of sleep debt on metabolic and endocrine function. The Lancet. 1999;354:1435 to 1439. doi:10.1016/S0140-6736(99)01376-8
15. Buffey AJ, Herring MP, Langley CK, et al. The acute effects of interrupting prolonged sitting time in adults with standing and light-intensity walking on biomarkers of cardiometabolic health in adults: a systematic review and meta-analysis. Sports Medicine. 2022;52(8):1765 to 1787. doi:10.1007/s40279-022-01649-4
16. NHS. Symptoms of type 2 diabetes and how it's diagnosed. nhs.uk, reviewed February 2025.

Think you might have insulin resistance, or already have the reports in hand? Dt. Trishala Goswami reads your fasting insulin, HbA1c and lipid results alongside your waist, cycle history and eating pattern, then builds an Indian food plan around them, online, wherever you live. Explore the Diabetes Management program or book a consultation on WhatsApp at +91 98199 48128.

Medical Disclaimer: This article is general nutrition guidance and does not diagnose insulin resistance, prediabetes or diabetes. Symptoms alone cannot confirm any of these conditions; only blood tests interpreted by your doctor can. If you take medication for blood sugar, blood pressure or PCOS, do not change it without your doctor's advice.