Even though the association between liver cirrhosis and glucose tolera
nce alterations has been well documented, no data are available on the
incidence of this association. In this paper we firstly report the re
sults of a 4-year prospective longitudinal study performed on well-com
pensated cirrhotic patients with a normal glucose tolerance, in order
to evaluate the incidence of glucose tolerance alterations with respec
t to liver efficiency during the time. The incidence of a diabetic res
ponse to a standard OGTT was 4.4% after a 1-year and 21.2% after a 4-y
ear follow-up in stable cirrhotics. These figures are significantly hi
gher than in the general population of our country. This large inciden
ce was even significantly higher in cirrhotics with worsening liver ef
ficiency at the end of the study (35.3%, P < 0.0001). Sex, family hist
ory of diabetes, alcoholic aetiology of the cirrhosis, and increment o
f portal hypertension do not seem to have any significant influence on
the frequency of altered glucose tolerance. Therefore, we propose tha
t liver cirrhosis and its worsening play a primary role as diabetogeni
c risk factors.