HOMA-IR
Composite insulin-resistance index
Typical optimal range
0.5–1.9
A HOMA-IR of roughly 0.5–1.9 is generally considered within the optimal range, with values below 1.0 often cited as ideal; exact cut-offs can vary between laboratories and clinical studies, so always interpret your result alongside your lab's own reference values. These figures are indicative — the range printed on your own lab report is the definitive one for your results.
NICE guideline NG28 covers type 2 diabetes prevention, and NICE guideline NG17 covers type 2 diabetes management; interpretation of insulin resistance markers follows NHS and laboratory guidance, and HOMA-IR is not currently a standalone NHS diagnostic test but is widely used in clinical and preventive practice.
What is HOMA-IR?
HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is a calculated index that estimates how well your body is responding to insulin. It is derived from two fasting blood measurements — glucose and insulin — using the formula: fasting glucose × fasting insulin ÷ 22.5. Because insulin resistance can develop silently for years before blood glucose alone rises into a concerning range, HOMA-IR gives an earlier, more nuanced picture of metabolic health that a fasting glucose test on its own can miss.
What a high HOMA-IR means
A raised HOMA-IR is a signal that your cells may be becoming less sensitive to insulin — a pattern known as insulin resistance — and is worth discussing with your GP, though it is not a diagnosis in itself. Caught early, it is a highly actionable finding.
- Excess body fat, especially visceral fat. Adipose tissue stored around the abdomen releases fatty acids and inflammatory signals that interfere with insulin signalling in the liver and muscles. Even modest increases in waist circumference are associated with rising HOMA-IR, independent of overall weight.
- Physical inactivity. Skeletal muscle is the body's largest site of glucose uptake, and regular movement is essential for maintaining insulin sensitivity. Prolonged sedentary behaviour — even in people who exercise occasionally — is independently linked to higher HOMA-IR.
- High intake of refined carbohydrates and ultra-processed foods. Diets rich in rapidly digested sugars and highly processed foods drive repeated large spikes in blood glucose and insulin, which over time can blunt the body's insulin response. This dietary pattern is consistently associated with worsening insulin resistance in population studies.
HOMA-IR can be temporarily elevated by acute illness, poor sleep, or significant psychological stress, so a single elevated reading does not necessarily reflect your usual metabolic state. It should ideally be measured after an overnight fast and interpreted alongside fasting glucose, HbA1c, and lipid results.
What a low HOMA-IR means
A low HOMA-IR indicates good insulin sensitivity, which is associated with healthy metabolic function — this direction is not a cause for concern.
Very low values in someone with known type 1 diabetes or pancreatic insufficiency may reflect low insulin secretion rather than high sensitivity, but in the general population a low result is simply reassuring.
Should I be worried?
A single HOMA-IR result above the optimal range is best understood as useful early information rather than a cause for alarm — insulin resistance exists on a spectrum and is highly responsive to lifestyle change, particularly when identified before blood glucose or HbA1c have shifted significantly. It is worth booking a review with your GP, who may want to look at the full picture alongside your fasting glucose, HbA1c, lipid profile, blood pressure, and waist circumference. NICE guidelines identify insulin resistance as a key feature of conditions such as type 2 diabetes risk, metabolic syndrome, and MASLD (metabolic dysfunction-associated steatotic liver disease), all of which benefit from early intervention. If your result is repeatedly elevated, your GP may discuss structured lifestyle support or referral to a diabetes prevention programme such as the NHS Diabetes Prevention Programme.
What actually helps
Insulin sensitivity is one of the most modifiable aspects of metabolic health, and several well-evidenced lifestyle changes can meaningfully lower HOMA-IR over weeks to months.
- Regular aerobic and resistance exercise. Both aerobic activity (such as brisk walking, cycling, or swimming) and resistance training improve glucose uptake in muscle independently of weight loss. UK Chief Medical Officers recommend at least 150 minutes of moderate-intensity activity per week, and even breaking up sitting time has been shown to help.
- Reducing refined carbohydrates and added sugars. Swapping ultra-processed, high-sugar foods for whole grains, legumes, and vegetables reduces the frequency and magnitude of insulin spikes. Low-glycaemic-index diets and Mediterranean-style eating patterns have the strongest evidence base for improving HOMA-IR.
- Achieving or maintaining a healthy body weight. Even modest weight loss of 5–10% of body weight, particularly when it reduces visceral fat, produces significant improvements in insulin sensitivity. The NHS Diabetes Prevention Programme uses this as a primary target.
- Prioritising sleep and managing stress. Poor sleep quality and chronic psychological stress both raise cortisol, which directly impairs insulin signalling. Aiming for 7–9 hours of consistent sleep and using evidence-based stress management techniques (such as physical activity or mindfulness) supports better metabolic control.
Certain foods have good supporting evidence for improving insulin sensitivity as part of an overall balanced diet.
Non-starchy vegetables
High in fibre and low in rapidly available glucose, they slow digestion and blunt post-meal insulin responses; associated with lower HOMA-IR in multiple cohort studies.
Oily fish (salmon, mackerel, sardines)
Rich in long-chain omega-3 fatty acids, which have anti-inflammatory effects and are associated with modest improvements in insulin sensitivity in intervention trials.
Legumes (lentils, chickpeas, beans)
Provide slowly digested carbohydrate and soluble fibre, producing a lower glycaemic response and supporting a gut microbiome associated with better insulin signalling.
Whole grains (oats, barley, wholegrain bread)
Beta-glucan and other soluble fibres in whole grains reduce postprandial glucose and insulin excursions; oats in particular have robust trial evidence for improving insulin sensitivity markers.
Nuts and seeds
Regular nut consumption is associated with lower fasting insulin and improved HOMA-IR in meta-analyses, likely due to their fibre, unsaturated fat, and magnesium content.
Extra virgin olive oil
A cornerstone of the Mediterranean diet, associated with reduced insulin resistance; polyphenol content may have anti-inflammatory effects relevant to insulin signalling.
Track your own HOMA-IR
Upload a lab PDF and Better Days trends HOMA-IR over time, flags it when it drifts, and suggests foods that help.
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Sources & further reading
These are reputable UK health resources for further reading. This page is written to be consistent with their guidance but is not a substitute for them.
For information only — not medical advice, and not individually reviewed by a clinician. Reference ranges vary by lab and individual. Discuss any results with a qualified clinician before making changes.