{"id":787,"date":"2026-06-22T04:24:51","date_gmt":"2026-06-22T04:24:51","guid":{"rendered":"https:\/\/healthafter55.com\/blog\/?p=787"},"modified":"2026-06-22T04:24:53","modified_gmt":"2026-06-22T04:24:53","slug":"signs-of-insulin-resistance","status":"publish","type":"post","link":"https:\/\/healthafter55.com\/blog\/signs-of-insulin-resistance\/","title":{"rendered":"Signs of Insulin Resistance: What to Look For After 55"},"content":{"rendered":"

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\n \"Richard\n <\/div>\n
\n Written by Richard Wells<\/strong>
\n Founder, HealthAfter55.com \u2014 Richard researches natural health strategies for adults over 55, with a focus on blood sugar, energy, and healthy ageing. He is not a medical professional. Always consult your doctor before making health changes.<\/span>\n <\/div>\n<\/div>\n
\n \"Older
\n<\/figure>\n

Most articles about the signs of insulin resistance<\/strong> give you a list of symptoms and leave it there. The problem is that the most important thing to understand about insulin resistance \u2014 the thing that makes it particularly dangerous \u2014 is that most people who have it feel completely fine. There are often no obvious symptoms at all, particularly in the earlier stages when lifestyle changes are most effective.<\/p>\n

The National Institute of Diabetes and Digestive and Kidney Diseases<\/a> states directly that people with insulin resistance and prediabetes usually have no symptoms. This is why routine blood tests matter more than waiting to feel unwell. By the time clear symptoms appear, insulin resistance has often been present for years.<\/p>\n

That said, there are signs \u2014 some physical, some visible on the skin, some showing up in how you feel after meals \u2014 that can indicate insulin resistance is present or developing. After 55, some of these signs look different than they do in younger adults, and several are unique to older age. This article covers all of them honestly, including what they mean, how reliable they are, and what to do when you notice them.<\/p>\n

\ud83d\uddd3\ufe0f Last reviewed and updated: June 2026<\/em><\/p>\n

\n \u26a1 Quick Answer<\/strong><\/p>\n

The most important sign of insulin resistance in adults over 55 is a blood test result showing borderline fasting blood glucose (5.6\u20136.9 mmol\/L or 100\u2013125 mg\/dL) or HbA1c between 5.7% and 6.4% \u2014 because most people have no physical symptoms at all in the early stages. Physical signs that may appear include a gradually expanding waistline, dark velvety patches of skin on the neck or armpits, small skin tags, persistent fatigue after meals, strong carbohydrate cravings, and difficulty concentrating. None of these are definitive on their own. A blood test is the only reliable way to confirm insulin resistance.<\/span>\n<\/div>\n

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Get Our Free Guide: 7 Natural Ways to Help Support Healthy Blood Sugar After 55<\/h3>\n

Practical, research-backed strategies for adults over 55 \u2014 including what to do if you recognise the signs of insulin resistance in yourself.<\/p>\n

Get the Free Guide \u2192<\/a>\n<\/div>\n

\n \ud83d\udccb What You’ll Learn<\/strong><\/p>\n
    \n
  1. The Silent Reality: Why Most People With Insulin Resistance Feel Fine<\/a><\/li>\n
  2. The Blood Test Signs \u2014 The Most Reliable Indicators<\/a><\/li>\n
  3. Physical Signs of Insulin Resistance<\/a><\/li>\n
  4. Skin Signs That May Point to Insulin Resistance<\/a><\/li>\n
  5. How You Feel \u2014 Functional Signs After Meals and Between Them<\/a><\/li>\n
  6. The Cognitive Signs Most Articles Miss<\/a><\/li>\n
  7. Risk Factors That Function as Warning Signs After 55<\/a><\/li>\n
  8. What to Do If You Recognise These Signs<\/a><\/li>\n
  9. Frequently Asked Questions<\/a><\/li>\n<\/ol>\n<\/div>\n
    \n

    The Silent Reality: Why Most Signs of Insulin Resistance Are Not What You Expect<\/h2>\n

    Before listing the signs, it is worth being honest about something most insulin resistance articles bury or skip: for the majority of adults with insulin resistance \u2014 particularly in the early and middle stages \u2014 there is nothing obviously wrong. No pain. No dramatic symptoms. The body continues to function, because the pancreas is quietly producing extra insulin to compensate for the cells that have stopped responding properly. This compensation can last for years.<\/p>\n

    This is why a 58-year-old can have significant insulin resistance, feel perfectly well, eat the same food they have eaten for years, maintain roughly the same weight, and have no idea that a slow metabolic deterioration has been building for years. The signs that do appear are often subtle, easy to dismiss, and easy to attribute to ageing, busy schedules, or other causes.<\/p>\n

    After 55, this is particularly relevant because the biological changes that drive insulin resistance \u2014 declining muscle mass, hormonal shifts, reduced physical activity \u2014 happen gradually and quietly. The signs of insulin resistance after 55 are often not dramatic symptoms at all. They are changes in blood test numbers, changes in waist measurements, and changes in how you feel after eating that are so gradual they become invisible.<\/p>\n

    \n \u26a0\ufe0f The most important message in this article:<\/strong> Do not wait to feel unwell before asking your doctor for a blood test. A fasting blood glucose test and HbA1c \u2014 a blood test that shows your average blood sugar over the past 3 months \u2014 are the only reliable ways to detect insulin resistance before it progresses. If you are over 55 and have not had these tests in the past year, asking for them at your next check-up is more important than any list of symptoms.<\/span>\n<\/div>\n
    \n

    The Blood Test Signs of Insulin Resistance \u2014 The Most Reliable Indicators<\/h2>\n

    These are the most reliable signs of insulin resistance \u2014 not because they feel like anything, but because they show up in routine blood tests that your doctor can order at any check-up.<\/p>\n\n\n\n\n\n\n\n\n
    Test<\/th>\nNormal<\/th>\nPrediabetes \/ Insulin Resistance Range<\/th>\nType 2 Diabetes<\/th>\n<\/tr>\n<\/thead>\n
    Fasting blood glucose<\/td>\nBelow 5.6 mmol\/L (100 mg\/dL)<\/td>\n5.6\u20136.9 mmol\/L (100\u2013125 mg\/dL)<\/td>\n7.0+ mmol\/L (126+ mg\/dL)<\/td>\n<\/tr>\n
    HbA1c (3-month average)<\/td>\nBelow 5.7%<\/td>\n5.7%\u20136.4%<\/td>\n6.5% or above<\/td>\n<\/tr>\n
    Triglycerides (blood fats)<\/td>\nBelow 1.7 mmol\/L (150 mg\/dL)<\/td>\nAbove 1.7 mmol\/L \u2014 associated with IR<\/td>\nOften elevated<\/td>\n<\/tr>\n
    HDL cholesterol (the “good” type)<\/td>\nAbove 1.0 mmol\/L men \/ 1.3 mmol\/L women<\/td>\nLow HDL is associated with IR<\/td>\nOften low<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Fasting blood glucose and HbA1c are the standard tests used to identify prediabetes \u2014 the stage at which insulin resistance has progressed enough to elevate blood sugar above normal. Triglycerides and HDL cholesterol are components of a standard lipid panel that your doctor may already order; the combination of high triglycerides and low HDL is independently associated with insulin resistance even when blood sugar is still in the normal range.<\/p>\n

    \n \ud83d\udca1 What to ask your doctor:<\/strong> “Can I have a fasting blood glucose test and HbA1c? I’d also like to see my triglycerides and HDL.” These are all routine blood tests. If your fasting glucose sits between 5.6 and 6.9 mmol\/L, or your HbA1c between 5.7% and 6.4%, insulin resistance is very likely present even if you have no symptoms. These numbers in isolation are not a crisis \u2014 they are a call to act on lifestyle factors before progression occurs.<\/span>\n<\/div>\n
    \n

    Physical Signs of Insulin Resistance<\/h2>\n

    These are the signs you can observe or measure without a blood test. None of them are definitive \u2014 each can have other explanations \u2014 but in combination they paint a meaningful picture.<\/p>\n

    An expanding waistline \u2014 the most important physical sign<\/h3>\n

    A gradually increasing waist circumference is one of the most reliable physical signs of insulin resistance \u2014 more reliable than overall body weight, because it reflects the accumulation of visceral fat (fat around the internal organs) rather than subcutaneous fat (fat under the skin). A large Korean population study found that waist circumference was positively associated with insulin resistance in both men and women<\/a>, confirming it as an independent marker of the condition.<\/p>\n

    For adults over 55, a waist measurement above 102 cm (40 inches) for men or 88 cm (35 inches) for women is associated with significantly elevated metabolic risk. Importantly, this is not about how you look \u2014 it is about where fat is stored. Visceral fat releases inflammatory compounds that directly worsen insulin signalling. A waistline that has been gradually expanding over 2\u20133 years, even without significant scale weight change, is a sign worth investigating.<\/p>\n

    High blood pressure<\/h3>\n

    Insulin resistance and high blood pressure frequently occur together as part of what is called metabolic syndrome \u2014 a cluster of conditions including high blood sugar, high blood pressure, excess abdominal fat, and abnormal cholesterol levels that together significantly increase cardiovascular risk. Insulin resistance contributes to high blood pressure through several mechanisms, including increased sodium retention by the kidneys and increased arterial stiffness. If you have been told your blood pressure is consistently above 130\/80 mmHg and also have borderline blood sugar, insulin resistance is likely a contributing factor worth discussing with your doctor.<\/p>\n

    Difficulty losing weight despite trying<\/h3>\n

    When chronically high insulin levels keep the body in fat-storage mode \u2014 blocking the process of breaking down stored fat for energy \u2014 weight loss becomes harder than calorie maths alone would predict. Adults who have been eating carefully and staying active but finding weight stubbornly resistant to change, particularly around the abdomen, may be experiencing the fat-burning block that insulin resistance creates. This is not a character flaw. It is a hormonal effect that requires addressing the insulin resistance itself, not just cutting more calories.<\/p>\n

    \n \"Older
    Waist circumference measured at navel level is a more reliable indicator of insulin resistance risk than overall body weight.<\/figcaption><\/figure>\n
    \n

    Skin Signs of Insulin Resistance<\/h2>\n

    Two skin changes are specifically associated with insulin resistance and are worth knowing about. Both are caused by the effect of chronically high insulin levels on skin cells \u2014 insulin acts as a growth signal, causing certain skin cells to multiply more rapidly than normal.<\/p>\n

    Acanthosis nigricans \u2014 dark velvety skin patches<\/h3>\n

    Acanthosis nigricans (pronounced ah-kan-THO-sis NIH-grih-kans) is a skin condition where patches of skin become darker, thicker, and develop a velvety or slightly rough texture. It appears most commonly on the back of the neck, in the armpits, and in skin folds around the groin. It does not wash off \u2014 it is a structural change in the skin, not a stain or discolouration from an external source.<\/p>\n

    Research consistently confirms that acanthosis nigricans and skin tags are associated with insulin resistance and should be used as screening markers for metabolic risk<\/a> \u2014 not dismissed as cosmetic issues. The skin change is caused by high insulin levels stimulating growth factor receptors in the skin, causing excess cell growth. It can develop gradually over months and may be dismissed as a “dark neck” or “dirty-looking skin” \u2014 but it does not improve with washing.<\/p>\n

    For adults over 55, acanthosis nigricans can be particularly easy to miss because skin changes are common with ageing. The key distinguishing features are: it is specifically in skin folds and creases, it has a velvety or rough texture rather than just a colour change, and it is symmetrical \u2014 appearing on both sides of the neck or both armpits rather than in an isolated patch.<\/p>\n

    \n \ud83d\udcca A real scenario:<\/strong> Margaret is 61 and has noticed over the past two years that the skin on the back of her neck looks darker and feels slightly rough. She assumed it was sun damage or normal ageing and has been scrubbing it in the shower, which has not made any difference. When she mentions it to her GP at a routine appointment, the doctor recognises it as acanthosis nigricans and orders a fasting blood glucose and HbA1c. Margaret’s HbA1c comes back at 5.9% \u2014 clearly in the prediabetes range. The skin change was a visible sign that had been present for two years before it was recognised.<\/span>\n<\/div>\n

    Skin tags<\/h3>\n

    Skin tags \u2014 small, soft growths of skin that hang from the surface, typically on a thin stalk \u2014 are common in adults generally. A single occasional skin tag is not meaningful. What is meaningful is the sudden appearance of multiple new skin tags, particularly if they appear in the same locations as acanthosis nigricans (neck, armpits, groin) in someone who is also gaining weight around the middle or has borderline blood sugar.<\/p>\n

    Like acanthosis nigricans, skin tags are caused by high insulin levels stimulating excess skin cell growth. They are not dangerous in themselves, but multiple new skin tags appearing together with other signs on this list is worth mentioning to your doctor.<\/p>\n

    \n

    How You Feel \u2014 Functional Signs of Insulin Resistance After Meals<\/h2>\n

    These are the signs that are easy to dismiss as normal tiredness, aging, or “just how I am now.” They become more meaningful when they occur together and consistently after eating.<\/p>\n

    Energy crashes after meals \u2014 particularly carbohydrate-heavy ones<\/h3>\n

    In insulin resistance, the pancreas releases large amounts of insulin in response to rising blood sugar after eating. This over-response can cause blood sugar to drop more sharply than it should after the initial spike, leaving you feeling suddenly tired, sluggish, or foggy 60\u201390 minutes after eating \u2014 particularly after carbohydrate-heavy meals like bread, pasta, rice, or sweet foods. This post-meal energy crash is one of the most consistently reported functional signs of insulin resistance and is often written off as normal ageing or needing more sleep.<\/p>\n

    Persistent hunger and carbohydrate cravings<\/h3>\n

    When cells are not absorbing glucose efficiently \u2014 even though blood sugar is technically elevated \u2014 the brain interprets the poor glucose delivery as hunger for more quick energy. This creates a pattern of strong cravings for sweet or starchy foods, often shortly after a full meal. The hunger is real \u2014 the cells genuinely are not getting enough energy \u2014 but eating more refined carbohydrates makes the underlying insulin resistance worse rather than better.<\/p>\n

    Feeling better after eating \u2014 but only briefly<\/h3>\n

    A pattern of feeling noticeably better immediately after eating but then crashing again within an hour or two \u2014 particularly with carbohydrate-based foods \u2014 is characteristic of the blood sugar swings associated with insulin resistance. If you eat regularly to maintain energy rather than from genuine hunger, and find your energy is unreliable without frequent snacking, this pattern is worth noting.<\/p>\n

    Persistent fatigue that is not explained by sleep<\/h3>\n

    Fatigue associated with insulin resistance is different from tiredness caused by poor sleep. It tends to be heavier and more persistent \u2014 a background tiredness that does not fully clear even after a good night’s rest. It may be worse in the afternoon, particularly after lunch. This kind of fatigue reflects the fact that cells are not using glucose efficiently for energy, even though blood sugar is elevated.<\/p>\n

    \n

    The Cognitive Signs of Insulin Resistance Most Articles Miss<\/h2>\n

    This is the section that almost no mainstream insulin resistance article covers \u2014 and it is particularly relevant for adults over 55.<\/p>\n

    Insulin does not just regulate blood sugar in the body. It also plays an important role in the brain \u2014 supporting memory, learning, and mental clarity. When insulin resistance develops, the brain can be affected too. A 2025 study in a large ageing population found that lower insulin sensitivity was significantly associated with cognitive impairment in non-diabetic older adults<\/a> \u2014 meaning cognitive changes can appear before blood sugar has reached the diabetes threshold.<\/p>\n

    For adults over 55, the cognitive signs that may indicate insulin resistance is affecting brain function include:<\/p>\n