Elevated GGTP is associated with insulin resistance (and also with fatty liver).
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Dig Liver Dis. 2009 Aug
Elevation of serum gamma-glutamyltranspeptidase (GGTP) activity is frequent in chronic hepatitis C, and is associated with insulin resistance.
Benini F, Pigozzi MG, Pozzi A, Bercich L, Reggiani A, Quattrocchi D, Distefano L, Donati P, Cesana BM, Lanzini A.
Gastroenterology Unit, University and Spedali Civili, Piazzale Spedali Civili, 1, 25126 Brescia, Italy.