 There are many recurrent criticisms to all trials showing the superiority of diuretics over other medications in controlling blood pressure. First of all, worsening of glucose metabolism, due to thiazide effects, is matter of concern 4,14-18. Also the ALLHAT authors report a higher incidence of diabetes in the diuretic group which, however, did not affect the outcome results 3. However, this concern is also sustained by recent evidence of the dangerous effect of incident diabetes in patients with arterial hypertension 15. 