What is Protein
Proteins in the one of the essential nutrient of human body,they are one of the building blocks of body tissue,and can also serve as a fuel source.The most important aspect and defining characteristic of protein from a nutritional standpoint is its amino acid composition.There are nine essential amino acids which a human must obtain from their diet in order to prevent protein energy malnutrition.They are phenylalanine, valine,threonine,tryptophan,methionine,leucin,isoleucine,lysin, and histidine,protein is a micro nutrient that is essential to building muscle mass.Each gram of protein contains 4 gram of calories.Protein makes up about 15 percent of a person's body weight. Chemically,protein is a composed of amino acids.which are compound made of carbon,hydrogen,nitrogen,oxygen or sulfur.
Types of protein
We sometimes hear that there are three types of protein foods.
Complete protein:These foods contain all the essential amino acids.They mostly occur in animal foods, such as meat, dairy, and eggs.
Incomplete protein:- These foods contain at lest one essential amino acids, so there is lack of balance in the protein. Plant foods,such as peas,beans, and grains contains mostly incomplete protein.
Complementary protein:- These refer to two or more foods containing incomplete proteins that people can combine to supply complete protein.
Examples include rice and beans or bread with peanut butter.
What do protein
Proteins plays a role in nearly all the biological process, and their functions very widely.
The main functions of protein in the body are to build repair or replace things, such as tissue.
They can be:
- structural, like collagen
- hormonal, like insulin
- carriers, for example, hemoglobin
- enzymes, such as amylase
All these are proteins
keratin is a structural protein that strengthens protective covering, such as hair. Collagen and elastin, too, have a structural function, and they also provide support for connective tissue.
Sources
Rice and bean together provide complete protein
Protein is one of the essential nutrient, or macro nutrients, in the human diet, but not all the protein we can eat converts protein in our body.
When people eat foods that contains amino acids,these amino acids make it possible for the body to create, or synthesize, proteins. If we do not consume some amino acids, we will not synthesize enough proteins for our bodies to function correctly.
There are also nine essential amino acids that the human body does not synthesize,so they must come from a diet.
All food proteins contains some of each amino acid,but in different proportion.
Gelatin is special in that it contain a high proportion of some amino acids but not the whole range.
Foods that contain these nine essential acids are roughly equal proportion are called complete protein. Complete protein mainly comes form animal sources, such as milk, eggs, and meat.Soy and quinoa are vegetable sources of protein. Combining red beans and lentils with wholegrain rice or peanut butter with whole meat bread also provides complete protein.
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