I've been taking it (after a quite uncertain diagnosis of 'mild asthma') for more than 2 years now. About a year ago I've been diagnosed with Diabetes Type 2, which came out of the blue as nobody has it in the family, plus I don't drink, don't smoke and I do eat healthyly. I am not overweight so even the doctors were a bit surprised... Hence my question: is it possible that montelukast could have 'unsetled' the insulin producing or absorbing balance in my system? Maybe perhaps for using it for so long?