why do we need protein in our diets
Protein is an essential nutrient found in animal products, nuts, and beans. The name protein name comes from the Greek word
protos, which means first. Your body uses proteins in your diet to build new cells, maintain tissues, and synthesize new proteins that make it possible for you to perform basic bodily functions. To visualize a molecule of protein, close your eyes and see a very long chain, rather like a chain of sausage links. The links in the chains are amino acids, commonly known as the building blocks of protein. In addition to carbon, hydrogen, and oxygen atoms, amino acids contain a nitrogen (amino) group. The amino group is essential for synthesizing (assembling) specialized proteins in your body. The human body is chock-full of proteins. Proteins are present in the outer and inner membranes of every living cell. Here s where else protein makes an appearance: Your hair, your nails, and the outer layers of your skin are made of the protein keratin.
Keratin is a scleroprotein, or a protein resistant to digestive enzymes. So if you bite your nails, you can t digest them. Muscle tissue contains myosin, actin, myoglobin, and a number of other proteins. Bone has plenty of protein. The outer part of bone is hardened with minerals such as calcium, but the basic, rubbery inner structure is protein; and bone marrow, the soft material inside the bone, also contains protein. Red blood cells contain hemoglobin, a protein compound that carries oxygen throughout the body. Plasma, the clear fluid in blood, contains fat and protein particles known as lipoproteins, which ferry cholesterol around and out of the body. About half the dietary protein that you consume each day goes into making enzymes, which are specialized worker proteins that do specific jobs, such as digest food and assemble or divide molecules to make new cells and chemical substances. To perform these functions, enzymes often need specific vitamins and minerals.
Your ability to see, think, hear, and move in fact, to do just about everything that you consider part of a healthy life requires your nerve cells to send messages back and forth to each other and to other specialized kinds of cells, such as muscle cells. Sending these messages requires chemicals called neurotransmitters. Making neurotransmitters requires guess what proteins. Finally, proteins play an important part in the creation of every new cell and every new individual. Your chromosomes consist of nucleoproteins, which are substances made of amino acids and nucleic acids. Protein is one of the three macronutrients found in food; the other two are and. accounts for 20 percent of our body, but why do we need in our, and what foods are healthy sources of? Why Do We Need? Protein is important to many physiological functions in the body, and is a vital component of body tissues, and immune cells.
It helps to: Keep the Maintain healthy, and Help the body produce Proteins are complex molecules made up of. These link together in specific numbers and unique combinations to make each different. Therefore is an essential component of the, because it provides the that the body needs to synthesize its own proteins. Proteins also interact with nutrients by binding with them and carrying certain and including, copper, and. As a result, inadequate intake may impair the function of these nutrients. Recent studies suggest that makes a meal more satiating, which in turn could help people maintain a healthy. A 2005 study published in the American Journal of Clinical Nutrition found that increasing from 15% to 30% of total, and reducing from 35% to 20% of - resulted in sustained . What Are Healthy Sources of? A wide variety of foods contain, including, dairy, and. How healthy a protein-rich food is typically depends on what else it contains.
For example: Fish is an excellent source of, however, most is loaded with harmful contaminants like, so should be eaten in moderation. Meat is one of the main sources of in many peoples' diets. Eggs are also abundant in. Plants such as and provide a good source of both and. Some foods contain all of the essential that the body needs; these are called complete proteins. There are other foods, however that provide some or none of the essential, and are referred to as incomplete proteins. Eggs, dairy foods, and poultry are typically considered to be complete proteins. Vegetarians or vegans often do not have a source of complete in their diets, but can easily obtain all of the essential by eating a variety of, and. References  Weigle et al A high-protein induces sustained reductions in appetite, ad libitum caloric intake, and body despite compensatory changes in diurnal plasma leptin and ghrelin concentrations. Am J Clin Nutr 2005, pages 41-8.
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