I knew eggnog lattes weren't helping my waistline, but this list of the top 10 most caloric Starbucks specialty drinks on CallMeThirsty.com nearly gave me a coronary! At the top, clocking in at 730 calories, is the Peppermint White Hot Chocolate. The Eggnog Latte is 630. (Numbers represent the venti size, made using whole milk and with whipped cream options.) Compare these to the number of calories in a Big Mac: 540.