<P> This list is a categorization of the most common food components based on their macronutrients . Macronutrients can refer to the chemical elements that humans consume in the largest quantities (See Nutrient) </P> <P> There are three primary macronutrients: carbohydrate, protein, and lipids . Macronutrients are defined as a class of chemical compounds which humans consume in the largest quantities (must be above a threshold amount) and which provide humans with the bulk of energy . While water does make up a large proportion of the total mass ingested as part of a normal diet, it does not provide any nutritional value . Alcohol is a calorically dense compound that can provide large amounts of bioavailable energy although it is not a necessary dietary component . </P>

Which element is in protein that does not exist in fat and carbohydrates