HOMA-IR (Insulin Resistance Index)

Metabolic

Glucose Regulation

HOMA-IR is a calculated index that combines fasting glucose and fasting insulin to quantify insulin resistance. Rather than measuring a single molecule, it estimates how well your cells are responding to insulin. A longevity practice values HOMA-IR because insulin resistance is an early, often silent driver of metabolic disease that appears before glucose markers become abnormal.

What It Measures

Calculated index from fasting glucose × fasting insulin / 405; quantifies insulin resistance

Optimal vs. Lab Range

Longevity Optimal

<1.0 optimal

Target range for optimal health and longevity based on research.

Standard Lab

<2.5 (normal)

Population-based reference range from standard labs.

Why It Matters

A high HOMA-IR indicates insulin resistance, a root cause linked to prediabetes, metabolic syndrome, PCOS, non-alcoholic fatty liver disease, and cardiovascular risk. Because it incorporates fasting insulin, it can detect metabolic dysfunction earlier than glucose-only measures like fasting glucose or HbA1c, which may stay normal while insulin climbs. Catching insulin resistance early is central to longevity because it sits upstream of much age-related metabolic and vascular disease. It is interpreted alongside fasting insulin, glucose, triglycerides, and the TG/HDL ratio. Low values are generally favorable, though very low readings can reflect beta cell insufficiency.

When Low

Generally favorable when low; very low may indicate beta cell insufficiency

When High

Insulin resistance, prediabetes, metabolic syndrome, PCOS, NAFLD, cardiovascular risk

How to Optimize

Improving insulin sensitivity is the goal, and resistance training combined with zone 2 cardio is particularly effective for enhancing how cells respond to insulin. Time-restricted eating and weight loss reduce the insulin demand that drives the index upward. Berberine is a commonly used dietary support for glucose and insulin regulation. Because HOMA-IR is calculated from fasting values, accurate results depend on a proper fasting draw. Targets and treatment are individualized with your physician; this content is educational and not a substitute for medical advice.

Key Interventions & Linked Compounds

Strong evidence

Key Interventions

Time-restricted eating

resistance training

zone 2 cardio

weight loss

berberine

Linked Compounds & Supplements

Berberine

Chromium

Myo-inositol

ALA

Magnesium

Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.

Ordering Notes

Specimen

Serum or plasma (venous draw)

Patient prep

No fasting required. Maintain usual diet and medications unless advised.

Recommended cadence

Quarterly

Reporting unit

Confirm with the performing lab — units vary by region.

Pre-analytic notes

Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.

Recommended Follow-Up Actions

1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift HOMA-IR (Insulin Resistance Index).
2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.