This list is a categorization of the most common food components based on their macronutrients. Macronutrients can refer to the chemical substances that humans consume in the largest quantities (See Nutrient)
There are three principal classes of macronutrients: carbohydrate, protein, and fat.[1] Macronutrients are defined as a class of chemical compounds which humans consume in relatively large quantities compared to vitamins and minerals, and which provide humans with energy. Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per gram) and proteins and carbohydrates 17 kJ/g (4 kcal/g).[2]
Water makes up a large proportion of the total mass ingested as part of a normal diet, but it does not provide any nutritional value. Ethanol provides calories, but there is no requirement for ethanol as an essential nutrient. Even though macros and calories are different concepts, they are dependent on each other. While macros refer to the three types of main nutrients that you need - protein, carbohydrate, and fat, calories, on the other hand refer to the nutritional value of your meal.[3]
Essential and non-essential amino acids
Oxygen is essential for life.
Water is also essential for life. It provides the medium in which all metabolic processes proceed. It is necessary for the absorption of macronutrients and micronutrients, but it provides no nutritional energy.
Dietary fiber from fruits, vegetables and grain foods. Insoluble dietary fiber is not absorbed in the human digestive tract, but is important in maintaining the bulk of a bowel movement to avoid constipation.[5] Soluble fiber can be metabolized by bacteria residing in the large intestine.[6][7][8] Soluble fiber is marketed as serving a prebiotic function with claims for promoting "healthy" intestinal bacteria.[9] Bacterial metabolism of soluble fiber also produces short-chain fatty acids like butyric acid, which may be absorbed into intestinal cells as a source of food energy.[6][7][8]
