Describe the important functions of the following nutrients and also give the three major food sources in our diet for each of them:
i. Protein
ii. Calcium
iii. Vitamin A
i. Proteins
Proteins are the building blocks of life. The body needs protein to repair and maintain itself. The basic structure of protein is a chain of amino acids.
Every cell in the human body contains protein. It is a major part of the skin, muscles, organs, and glands. Protein is also found in all body fluids, except bile and urine.
Protein in your diet to help your body repair cells and make new ones. Protein is also important for growth and development during childhood, adolescence, and pregnancy.
When proteins are digested, amino acids are left. The human body needs a number of amino acids to break down food. Amino acids need to be eaten in large enough amounts for optimal health.
Amino acids are found in animal sources such as meats, milk, fish, and eggs, as well as in plant sources such as soy, beans, legumes, nut butters, and some grains (such as wheat germ).
Other good sources of protein include:
- Pinto beans, black beans, kidney beans, lentils, split peas, or garbanzo beans
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