The cranberry juice would NOT make a difference to the amount of glucose that you had present in your bloodstream, my friend, unless you were already diabetic.
In a non-diabetic, glucose (sugar) control is a tightly controlled subsystem that's managed by your pancreas.
You CAN put on weight, particularly if you develop type 2 diabetes. It used to be believed that it was the extra weight that caused people to develop type 2 diabetes. Current understanding, however, seems to suggest that it MAY actually be the diabetes ... or rather metabolic syndrome (Syndrome X) that causes that causes the weight gain.
One good thing, my friend, is that if you do have diabetes you were lucky in it being picked up now. Sadly, some diabetics don't find out until damage has already been caused to their body's organs, blood vessels, and nerves. This puts you in an ideal situation to make sure that it never gets to that stage.
I wish you well.