Diabetes Care, Vol 21, Issue 5 732-737, Copyright © 1998 by American Diabetes Association

ARTICLES

Prospective study of serum gamma-glutamyltransferase and risk of NIDDM

IJ Perry, SG Wannamethee and AG Shaper
Department of Primary Care and Population Sciences, Royal Free Hospital School of Medicine, London, U.K. i.perry@ucc.i.e

OBJECTIVE: Serum gamma-glutamyltransferase (GGT) levels are raised in obese individuals, and a particularly strong association with central obesity has been described. We hypothesized that elevated GGT levels are a marker for visceral fat, and specifically for hepatic steatosis (fatty liver), and that hepatic steatosis leads to hepatic insulin resistance. To test this hypothesis, we examined the association between GGT levels and risk of NIDDM. RESEARCH DESIGN AND METHODS: We carried out a prospective cohort study of incident cases of doctor-diagnosed NIDDM in a group of 7,458 nondiabetic men (aged 40-59 years) followed for a mean of 12.8 years (range 11.5-13.0). The men were randomly selected from general practice lists in 24 British towns. Cases of NIDDM were ascertained by repeated postal questionnaires to the men and by regular systematic review of primary care records. RESULTS: A total of 194 men developed NIDDM during follow-up. Mean serum GGT at baseline (geometric mean [95% CI]) was significantly higher in the NIDDM patients than in the rest of the cohort (20.9 [19.3-22.6] vs. 15.3 U/l [15.0-15.6], P < 0.0001). There was a smooth, graded increase in the age-adjusted risk of NIDDM with increasing GGT levels, with a relative risk in the top fifth of the distribution of 6.8 (3.5-12.9) relative to the bottom fifth (trend P < 0.0001). This association was independent of serum glucose and BMI and of other predictors of NIDDM with which GGT is associated, including alcohol intake and physical activity level (adjusted upper to lower fifth relative risk: 4.8 [2.0-11.8], trend P < 0.0001]). CONCLUSIONS: These findings suggest that a raised serum GGT level is an independent risk factor for NIDDM. Serum GGT level may be a simple and reliable marker of visceral and hepatic fat and, by inference, of hepatic insulin resistance.
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