Will and Juan decided to make a snack after school: peanut butter and jelly sandwiches and a glass of cold milk. They assembled the following ingredients: bread skim milk grape jelly peanut butter

Peanut butter because it contains oils or lipids. (The chemical energy in foods and the eventual caloric value is derived from the chemical bonds within the substance. The larger the molecule, the more chemical bonds. That means the more chemical energy and the higher the caloric value. Simple sugars are smaller than carbohydrates and carbs are smaller than lipids. Skim milk is low in fats