The human liver is on of the most important organs involved in the metabolism and storage of nutrients.

Carbohydrate metabolism :-

The liver plays a major role in carbohydrate metabolism. Galactose and fructose - products of carbohydrate digestion, are converted into glucose in the hepatocyte. Liver stores glucose as glycogen (glycogenesis) and then returns it to the blood when glucose levels become low (glycogenolysis).

Protein metabolism :-

Transamination and oxidative deamination are two such pathways, which convert amino acids to substrates that are utilized in energy and glucose production. Hepatocytes detoxify ammonia by converting it to urea, 75% of which is excreted by the kidneys. Synthesis of vital plasma proteins such as albumin, fibrinogen, transferrin, ceruloplasmin and lipoprotein takes place in the liver.

Fat metabolism :-

Fatty acids from the diet and adipose tissue are converted in the liver to Acetyl-CoA by the process of beta - oxidation to produce energy. Ketone bodies are also produced. The liver also synthesizes triglycerides, phospholipids, cholesterol, and bile salts.

Vitamins and minerals :-
The liver is involved in the storage, activation and transport of many vitamins and minerals. It stores all of the fat - soluble vitamins in addition to zinc, iron, copper, magnesium and vitamin B12.