Yes, you will add those calories to your meal plan. We suggest you use skim milk which contains about 90 calories for 1 cup, but you can use 1% or higher if you'd like. Just make sure to adjust your food intake to compensate for the increase in calories from the milk.
The primary carbohydrate in the meal replacement formula is fructose. Fructose as its main sugaris a slower digesting sugar. Fructose is classified as a "Sugar" on FDA labeling even though it has one of the lowest glycemic indexes. Fructose does little to spike your blood sugar levels, rather, it is processed by the liver and stored as glycogen until you run very low on blood and muscle glycogen stores. So this formula can be considered a lower glycemic food or supplement.