Your tax dollars have enabled the Health Department to conclude a groundbreaking study on the calorie counts of beverages at Starbucks and Dunkin' Donuts. And what they found might shock you: Calories in blended coffee beverages are high. The report is the prelude to another study due out next spring, which is expected to show if New Yorkers were affected by rules requiring chains like Starbucks to display calorie counts. Back in 2007, the average customer consumed 12% of a 2,000-calorie a day diet on beverages alone.