http://www.medscape.com/viewarticle/705051
"Long-Term Use of Antidepressants For Depressive Disorders and the Risk of Diabetes Mellitus."
"Changes Clinical Practice: Patients receiving a moderate to high daily dose of antidepressants for greater than 12 months should be evaluated for impaired glucose tolerance/diabetes."
(Article dated 1st July 2009, need to register to read the whole thing so presumably disallowed to copy it all to the forum)