Proteins are known as the building blocks of the body. They are
essential for growth, for building body tissues, and for basic body functions.
They can also be used for energy if the diet does not contain enough
carbohydrates and fats.
Proteins consist of substances called amino acids. The body is able to
manufacture many of them, but there are nine amino acids it cannot manufacture
and must get from foods. A food protein that contains all nine essential amino
acids is called a complete protein. Meats, poultry, fish, eggs, and dairy
products contain complete proteins.
Proteins that lack one or more of these essential amino acids are
called incomplete proteins. Foods high in incomplete proteins include nuts,
grains, and dried beans and other legumes. Foods that, if eaten together,
supply all the amino acids are called complementary proteins. For example,
cornmeal tortillas topped with chili beans supply complete protein because the
corn supplies the amino acids lacking in the beans. Beans and rice is another
example of a food combination supplying complementary proteins.
Complementary proteins are especially of interest to vegetarians,
especially vegans.
The average adult needs about 50 to 60 grams of protein a day. For most
North Americans, getting enough protein daily is not a problem; most get about
twice as much as they need. Greatly excessive protein in the diet can lead to a
variety of health problems, including kidney and liver damage.
[source: professional cooking sixth edition]
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