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.
A nutrient is a chemical substance that comes from the food you eat. The energy you need for the metabolic processes in your body and for maintaining a constant internal environment comes from these nutrients.gain the term âessentialâ implies that these six essential nutrients are necessary in order to maintain and develop a healthy body. These are the 6 Essential Nutrients your body needs daily: 1. Proteins â they make up most of the cell structure including the cell membrane.