TyG Index

The math is simple. Your fasting triglycerides and fasting glucose, both in mg/dL, get multiplied, halved, and run through a natural log: TyG = ln[triglycerides x glucose / 2]. One number falls out.

Here is why those two values travel together. When your tissues stop responding to insulin, your liver releases more triglycerides while your fasting glucose drifts upward. They are two prints of the same process, so pairing them sharpens the signal. The TyG Index often tracks insulin resistance about as well as the more involved HOMA-IR.

A higher TyG Index points toward insulin resistance, and what makes the number useful is how movable it is. Triglycerides and glucose both respond quickly to diet, weight, and activity, so a high score is an early heads-up you can act on, not a verdict. A lower score points to good insulin sensitivity.

In large studies, a higher score also tracks with greater risk of type 2 diabetes, fatty liver, metabolic syndrome, and cardiovascular disease. Read it as a trend and a clue, not a diagnosis, and go over it with your clinician alongside your other markers.