It is starch! I think
Starch is digested by ptyalin.
food!!
Protien
Amino Acid
Nothing is digested by the liver in the digestive system at all. So there is basically no answer to it.
Saliva
The nutrient that is not digested but stimulates intestinal muscle contractions is fiber. Fiber is a type of carbohydrate that may be soluble or insoluble.
Starch (carbohydrates) is broken down (digested) to maltose by salivary amylase.
proteinslipidscarbohydrates
It's because in the mouth we masticate the food.Mastication increases the surface area of the food which helps to accelerate the breakdown of the carbohydrate molecules.Whereas in other parts of the digestive system where foods are chemically digested mastication does not occur.so foods containing starch start to be chemically digested.
CelluloseAnswer:To be a nutrient a food material has to be digested and incorporated into the body as stored fat, converted to muscle or other protein, or converted to energy. So no nutrient as "not digested"/ Non-nutrient materials which provide other functions are fiber and water, and minerals asn trace chemicals such as salt, iron, zinc. Vitsmins can be regarded as supplimental to the body's own production. fibre can not be digested
Your body can not absorb the food if it is not digested chemically. Your body can absorb the simple sugars like fructose and glucose, vitamins and minerals only, without digestion.