Macronutrients There are four major organic compounds in the human body, these are called macronutrients. The categories are Proteins, Carbohydrates, Lipids, and Nucleic Acids. PROTEINS: (promotes to build muscle) Proteins are responsible for the construction of cellular parts, synthesis of enzymes and hormones. If we break proteins down, we would find that they are composed of units called Amino Acids. Amino Acids are the building blocks of muscle tissue which contain mainly carbon, hydrogen, oxygen and nitrogen atoms. There are 20 different types of Amino acids, some examples are: glutamic acid, valine, alanine, and tyrosine. CARBOHYDRATES: (Main energy source of your body to perform muscular contractions) Glucose; atoms formed from compounds of carbon, hydrogen and oxygen. Glucose is also called Dextrose or blood sugar. These are produced naturally by the body through digestion from more complex carbohydrates. Other forms of sugar is Galactose and Fructose which are very similiar to glucose however they have a slightly different linkage of carbon-to-hydrogen-to-oxygen. There are three kind of carbohydrates: monosaccharides, disaccharides, and polysacchrides. They are distinguished by the combination and numbers of sugar within a molecule. Glycogen: is stored in muscle and the liver, which is derived from carbohydrates. LIPIDS: (FATS)(source of energy for moderate activities) The contents of lipids are the same of carbohydrates (carbon, hydrogen and oxygen) but have a significant ratio of hydrogen to oxygen. Fats are composed of glycerol molecules. Unsaturated Fats: are fatty acids with on or more double bonds in the molecule where hydrogen atoms are missing. These fats tend to liquefy in room temperature and are found mostly in plant sources. Saturated Fats: are fatty acids with no double bonds. These are found mainly in animal product.