It’s not Christmas yet, but it will be before you know it. Unless eggnog is your absolute favorite holiday treat, skip it. This is one decedent dessert that is worth avoiding all together. One cup could have 60 grams of sugar. According to CalorieKing, just one cup of eggnog averages around 344 calories, 19g of fat, 150mg of cholesterol, 137mg of sodium and about 34g of carbs. The drink is full of sugar, eggs, bourbon and whip cream.