Grumpy Old Geeks Products Diet Mountain Dew Product Diet Mountain Dew 2 mentions in 1 episode A soft drink whose ingredients and zero calorie label one host discusses. Mentions 18: A Cornucopia of Crazy Making Jul 29, 2013 53:02 I am drinking Diet Mountain Dew today. 53:54 it says zero calories per can on a can of Diet Mountain Dew.