1 gram of protein = 4 calories
Proteins are the building blocks of human and animal structure. Proteins are key to the formation of the brain, nervous system, blood, muscle, skin, and hair. Proteins are also responsible for transportation of vitamins, minerals, fats, and oxygen. Proteins are also used to form antibodies, which are used by the body to fight infection. Proteins are made up of amino acids - small units necessary for growth and tissue repair. There are 8 to 10 essential amino acids which the body cannot make on its own and must be consumed through diet. Protein is the body's most plentiful substance, except for water & fat. Animal foods such as beef, fish, poultry, milk, and eggs are rich in protein. Good plant sources of protein are beans, legumes, peas, nuts, bread and cereals. Generally speaking, animal sources of protein contain all essential amino acids (known as a complete protein), plant sources do not - the exception is soy, a plant based complete protein.
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