Opal is considered the birthstone for people born in October. Famous opals. The Olympic Australis, the world's largest and most valuable gem opal [citation needed], found in Coober Pedy; The Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal
1 Carbohydrates â are required for energy. 2  Glucose, which is a monosaccharide, is the most essential source of energy in the body. 3  The brain works entirely on glucose alone. 4  When an immediate source of energy is required, glucose is converted into glycogen which is stored in the liver.
All foods provide nutrients. Energy is provided by the nutrients carbohydrate, fat and protein. Other nutrients include vitamins and minerals. The amount of energy and nutrients provided by food depends on its size, known as a portion. Different nutrients have different functions in the body to keep us healthy.nergy is provided by the nutrients carbohydrate, fat and protein. Other nutrients include vitamins and minerals. The amount of energy and nutrients provided by food depends on its size, known as a portion. Different nutrients have different functions in the body to keep us healthy.