This list is a categorization of the most common food components based on their macronutrients.
[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.
Insoluble dietary fibre is not absorbed in the human digestive tract but is important in maintaining the bulk of a bowel movement to avoid constipation.
[5] Soluble fibre can be metabolized by bacteria residing in the large intestine.
[6][7][8] Soluble fibre is marketed as serving a prebiotic function with claims for promoting "healthy" intestinal bacteria.