Colombian Coffee Calories, WOW~!~

I was entering my morning coffee drink into my diary and for the first time I actually put in the coffee to see the calories. I know I should have entered it before:embarassed: , but I foolishly thought coffee (brewed and black) had NO calories:drinker: . I was wrong! Colombian coffee came up as 35 calories for 16 ounces. I have searched high and low to figure out why, even went to the Folger's web site. Can anyone explain why Colombian has calories but regular brew does not??? I know 35 calories is not much but it is when you thought it was 0.:embarassed: