Physiological Role
HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) is an index calculated from two fasting measurements: insulin and blood glucose. The formula multiplies insulin concentration (in µIU/mL) by glucose concentration (in mg/dL), then divides by 405. The result reflects the balance between insulin production by the pancreas and cellular response to this hormone.
Insulin is a hormone secreted by the beta cells of the pancreas. Its primary role is to facilitate glucose entry into muscle, liver and fat cells. When tissues respond efficiently to insulin signaling, a small amount is sufficient to regulate blood glucose. HOMA-IR translates this efficiency into a single number.
A low HOMA-IR indicates that tissues absorb glucose with minimal insulin. A high HOMA-IR signals that the pancreas must produce more insulin to achieve the same result. This state, called insulin resistance, can remain invisible in a standard panel: blood glucose stays normal as long as the pancreas compensates. HOMA-IR makes this silent compensation visible.
Reference Ranges
Depending on the biomarker, Singular ranges are based on a synthesis of nutritional or clinical reference points and longevity research. They do not replace your laboratory's reference values or your healthcare professional's advice.
Biological Significance
A HOMA-IR in the optimal zone reflects normal tissue sensitivity to insulin. This is the most favorable scenario for long-term metabolic health.
When HOMA-IR falls in the elevated zone, the pancreas produces more insulin than necessary to maintain blood glucose. This compensatory hyperinsulinemia is an early signal. It often precedes any detectable abnormality in fasting glucose or HbA1c by several years.
A very high HOMA-IR indicates marked tissue resistance to insulin. The pancreas operates under increased load to maintain glucose homeostasis. Cohort studies associate this state with increased cardiovascular risk.
The value of HOMA-IR lies in its ability to reveal a drift before conventional markers. By combining insulin and glucose, it reveals an imbalance that neither shows alone. Longitudinal monitoring of this index provides a nuanced reading of metabolic health evolution.
Influencing Factors
Diet. The quality and quantity of carbohydrates directly influence HOMA-IR. A diet high in refined sugars and high-glycemic-index carbohydrates increases insulin demand. Fiber, protein and unsaturated fats slow glucose absorption and help maintain a favorable HOMA-IR.
Physical activity. Regular exercise improves tissue sensitivity to insulin. Muscle contraction stimulates glucose uptake independently of insulin via GLUT4 transporters. Both endurance and resistance training produce a favorable effect on HOMA-IR.
Body composition. Excess visceral adipose tissue is closely linked to insulin resistance. Visceral adipocytes release free fatty acids and cytokines that disrupt insulin signaling in peripheral tissues.
Sleep. Insufficient or poor-quality sleep impairs insulin sensitivity. Sustained sleep restriction degrades that sensitivity in healthy adults, independently of diet and physical activity.
Chronic stress. Cortisol promotes hepatic gluconeogenesis and reduces glucose uptake by muscle cells. Prolonged stress maintains cortisol levels that oppose insulin action.
Age. Insulin sensitivity tends on average to decline with age, without that decline being inevitable. This makes HOMA-IR monitoring particularly relevant after forty.
In the Singular Formula
HOMA-IR is part of the metabolic panel analyzed by Singular. Calculated from fasting insulin and fasting glucose, it provides an integrated reading of insulin sensitivity. These two markers taken separately cannot offer this cross-referenced view.
When HOMA-IR sits in the high or very high zone, the engine raises taurine dosage to its reinforced level and delivers dietary guidance content. Fasting glucose, fasting insulin and HbA1c trigger the same rule, each independently. A separate safety rule, commanded by elevated HOMA-IR alone, additionally removes glucosamine sulfate from the formula.
Omega-3 EPA+DHA, magnesium and vitamin D3 are part of the Singular formula.
HOMA-IR is a derived index. Singular measures fasting insulin and fasting glucose in every panel, then automatically calculates HOMA-IR. This cross-referencing reveals compensated insulin resistance that neither insulin nor glucose reveals alone. HbA1c, also measured, completes this panel by reflecting glycemic exposure over three months.
Linked Bioactives
Scientific Studies
| Authors | Year | Type | Journal | |
|---|---|---|---|---|
| Paolisso G et al. | 1996 | Cohort Study | American Journal of Physiology | View on PubMed |
Glucose tolerance and insulin action in healthy centenarians Study of 14 healthy Italian centenarians, compared with 22 older subjects and 20 adults under fifty. Their glucose tolerance and insulin action, measured with the euglycemic clamp, remain preserved. The study measures insulin effectiveness rather than the index calculated from fasting values. | ||||
| Bonora E et al. | 2007 | Cohort Study | Diabetes Care | View on PubMed |
Insulin resistance as estimated by homeostasis model assessment predicts incident symptomatic cardiovascular disease in Caucasian subjects from the general population: the Bruneck Study Bruneck cohort (n=919 adults 40-79 years, 15-year follow-up) demonstrating that HOMA-IR independently predicts incident cardiovascular events in the general population, after adjusting for classical factors. | ||||
| Matthews DR et al. | 1985 | Observational Study | Diabetologia | View on PubMed |
Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man Foundational paper defining the HOMA model. From fasting glucose and insulin concentrations, the authors propose a simple index to estimate insulin resistance and beta-cell function. They also publish its limitation: the precision of the estimate is low, with a coefficient of variation of 31% that restricts its use. | ||||
| Wallace TM et al. | 2004 | Review | Diabetes Care | View on PubMed |
Use and abuse of HOMA modeling Critical review of HOMA usage in the literature. The authors clarify appropriate use contexts and the model's limitations. | ||||
| Gast KB et al. | 2012 | Meta-analysis | PLoS One | View on PubMed |
Insulin resistance and risk of incident cardiovascular events in adults without diabetes: meta-analysis Meta-analysis of 65 studies. The relative risk of coronary events is 1.64 for high HOMA-IR values in non-diabetic adults. | ||||
| Zhang X et al. | 2017 | Meta-analysis | Biosci Rep | View on PubMed |
Fasting insulin, insulin resistance, and risk of cardiovascular or all-cause mortality in non-diabetic adults: a meta-analysis Meta-analysis of 7 studies and 26,976 non-diabetic adults. High HOMA-IR is associated with increased risk of all-cause mortality (RR 1.34) and cardiovascular mortality (RR 2.11). The authors consider this second result fragile: it rests on only two studies. | ||||
| Lin Z et al. | 2024 | Cohort Study | Diabetes & Metabolism | View on PubMed |
Insulin-based or non-insulin-based insulin resistance indicators and risk of long-term cardiovascular and all-cause mortality in the general population: A 25-year cohort study NHANES III cohort of 13,909 adults, median follow-up of 25 years and 5,306 deaths. HOMA-IR is associated with all-cause mortality, in people living with diabetes as in those without. | ||||
| Wang J et al. | 2024 | Meta-analysis | Frontiers in Pharmacology | View on PubMed |
Effects of administering berberine alone or in combination on type 2 diabetes mellitus: a systematic review and meta-analysis Meta-analysis of 50 randomized trials in 4,150 adults with type 2 diabetes. For HOMA-IR, berberine alone showed no clear difference across 7 studies, whereas adding it to medication was associated with a reduction across 6 studies; this difference should be interpreted cautiously because many trials were low quality and their results varied widely. | ||||