The Early Markers of Insulin Resistance Show Up Before Glucose
Fasting glucose is a late signal. Fasting insulin and triglyceride ratios move earlier.
Dr. Laila Varma
Contributing Clinician
Oct 7, 2026 • 10 min
What the data says
Years
Insulin resistance typically precedes any abnormal fasting glucose reading by a long interval.
Source: Longitudinal metabolic cohort data
Fasting glucose stays normal for a long time while insulin output rises to keep it there. By the time glucose drifts up, the compensation has been running for years.
Fasting insulin, the triglyceride-to-HDL ratio, and an oral glucose tolerance test with insulin measured alongside detect the earlier phase. None are standard in routine screening.
Waist-to-height ratio and liver enzymes add cheap context, since visceral and liver fat are tightly linked to the picture.
Interpretation belongs with a clinician. The reason to know these exist is to ask for them, not to score yourself at home.
Editorial note: this article summarises published research for general information. It is not medical advice. Discuss any intervention with a qualified clinician.
