I have recently been urinating often and heavily even though i am drinking less? what could this be?

Depends: It is very important to get a thorough history. Based on the limited information given above, it is nearly impossible to give a good differential. However, if you are drinking less but still urinating "heavily", I would like to make sure that you don't have undiagnosed diabetes. Once blood glucose exceeds 200-250 mg/dl, the kidneys lose their ability to concentrate urine.