The human body is made up of two-thirds water and it is an essential
nutrient that is involved in every function of the body. Water helps
transport nutrients and waste products in and out of cells and is
necessary for all digestive, absorption, circulatory, and excretory
functions. Maintenance of the proper body temperature is determined
by water and it is recommended that you drink at least eight 8-ounce
glasses of water each day.

Carbohydrates, such as starch and sugars need to be broken down into
simpler molecules by enzymes in the saliva and pancreatic enzymes.
Starches are digested by the enzyme in saliva and pancreatic juices and
sugars are digested by an enzyme found in the lining of the small
intestine.

Fibre is indigestible and does not get broken down at all by enzymes.
Soluble fibre can be dissolved in water, whereas insoluble fibre passes
through the intestines unchanged.

Fats need to be broken down by being dissolved in the intestine and
then by the bile acids produced by the liver, so they form tiny droplets.
These droplets are then carried into the cells of the mucosa before
changing back into large molecules. They then pass into the lymphatic’s
to be carried to the veins of the chest, and by blood vessels to the fat
deposits in the body where they are laid down as storage.
Proteins must start to be digested by an enzyme in the stomach before
they can be used to help build and repair the bodies cells and tissues.
Once in the small intestine, pancreatic enzymes complete the
breakdown of larger protein molecules into smaller ones called amino
acids. Once absorbed, they can be carried to all parts of the body for
growth and repair.

Vitamins are classified by being either water-soluble vitamins (the B
vitamins and vitamin C) or fat-soluble vitamins (vitamins A, D, E, and K).
It is difficult to store water-soluble vitamins, and any excess are flushed
out in the urine. Fat- soluble vitamins can be stored in the liver and the
fatty tissue of the body.

Minerals are needed in small amounts. Minerals are classified into
essential minerals and trace minerals, with the body only needing very
small amounts of trace minerals. Those classified as essential are
magnesium, sulphur, sodium, potassium, phosphorus, iron and calcium.
The main function of minerals is to control body fluids, build strong
bones and teeth and to assist with converting food into energy that can
be used.

Water is an essential nutrient which makes up around 50-75% of our
body weight. It removes toxins in the body, regulates temperature and is
essential for growth of the body.