{"id":4025,"date":"2024-05-05T03:34:02","date_gmt":"2024-05-05T03:34:02","guid":{"rendered":"https:\/\/peykmagazine.com\/en\/?p=4025"},"modified":"2024-05-05T03:34:02","modified_gmt":"2024-05-05T03:34:02","slug":"protein-quality-matters","status":"publish","type":"post","link":"http:\/\/peykmagazine.com\/en\/2024\/05\/05\/protein-quality-matters\/","title":{"rendered":"Protein Quality Matters"},"content":{"rendered":"<p class=\"p1\"><span class=\"s1\">Educational Series<br \/>\n<\/span>The Science of Nutrition<\/p>\n<h3 class=\"p1\"><span style=\"color: #993300;\">Protein Quality Matters<\/span><\/h3>\n<hr \/>\n<p class=\"p1\"><b><i>By Mohammad Ahrar, PhD<\/i><\/b><\/p>\n<hr \/>\n<p class=\"p1\"><span class=\"s1\"><b>Introduction<\/b><\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Protein is an essential macronutrient, which is necessary for growth, tissue repair, and maintaining health. Almost all foods contain protein, but not all food sources of protein are created equally and you may not need as much protein as you think you do. In this article, we will discuss different types of proteins and why some proteins are not considered complete or good quality proteins.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3996\" src=\"http:\/\/peykmagazine.com\/en\/wp-content\/uploads\/2024\/05\/Protein2.jpg\" alt=\"\" width=\"985\" height=\"499\" srcset=\"http:\/\/peykmagazine.com\/en\/wp-content\/uploads\/2024\/05\/Protein2.jpg 985w, http:\/\/peykmagazine.com\/en\/wp-content\/uploads\/2024\/05\/Protein2-515x261.jpg 515w, http:\/\/peykmagazine.com\/en\/wp-content\/uploads\/2024\/05\/Protein2-768x389.jpg 768w\" sizes=\"auto, (max-width: 985px) 100vw, 985px\" \/><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\"><b>What Is Protein?<\/b><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Protein is found throughout the body\u2014in muscle, bone, skin, hair, and virtually every other body part or tissue. All cells in your body contain a cell membrane. Proteins are important molecules of the cell membranes. About 50% of protein in the body is found in muscles. All chemical reactions in the cells that produce energy are catalyzed by enzymes, which are specialized protein molecules. The hemoglobin in your blood that carries oxygen to tissues and cells is a complex protein. At least 10,000 different proteins make you what you are, how you behave, and how you interact with the environment.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\"><b>What Are Proteins Made Of?<\/b><\/span><\/p>\n<p class=\"p2\">All proteins are made of subunits called amino acids. Each amino acid contains a nitrogen component in the form of an amine group (-NH2) and an acid group (-COOH), hence called amino acid. There are 23 known amino acids in nature, but only 20 of them participate in the formation of proteins. When amino acids are put together in an exact sequence, they make a specific protein. Some proteins may contain hundreds of amino acids. Please visit <i>Peyk<\/i> #162 for more information about proteins.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Can The Human Body Make Proteins?<\/b><\/span><\/p>\n<p class=\"p2\">The simple answer is yes. However, because our body does not store amino acids, the body can make them in two different ways:<\/p>\n<p class=\"p2\"><span class=\"s3\">By recycling proteins in the body<\/span>: Some proteins in the body normally break down into amino acids and the body uses them to make new proteins. As an example, if you do not get enough protein from your diet for a long period, the body uses your muscle proteins to make the necessary proteins.<\/p>\n<p class=\"p2\"><span class=\"s3\">From food:<\/span> When we eat food, the digestive system breaks down the food proteins into amino acids, which are absorbed as such. Amino acids can bind together in a series of chemical reactions in organs, such as the liver, to make new proteins.<\/p>\n<p class=\"p2\">For a protein to be made, two points should be considered. First, the law of all or none applies. For a protein to be synthesized in our body, all 20 amino acids must be available to the cells so that they can be put together to form a specific protein molecule. If one or more of the amino acids are missing, the correct form of a protein cannot be synthesized. Second, there must be the correct sequence of amino acids to form a protein. Otherwise, an abnormal protein may be formed. It is the job of your DNA to control the proper sequence of amino acids in a specific protein.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Can The Human Body Make Amino Acids?<\/b><\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Again, the answer is yes, but there is a trick to it. Nine of the 20 amino acids are considered <i>essential<\/i> because the human body cannot synthesize them (or not enough of them), so they must be supplied through the diet. They include\u00a0histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The other 11 amino acids are referred to as nonessential amino acids, but are also necessary for protein synthesis. The body can make nonessential amino acids if enough essential ones are present.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Good Quality v. Poor Quality Proteins<\/b><\/span><\/p>\n<p class=\"p2\">High-quality proteins (also known as complete proteins) are the proteins in foods that supply all nine essential amino acids in adequate amounts that the body requires for the synthesis of its proteins. Low-quality proteins (also known as incomplete proteins) are low in or lacking one or more of the essential amino acids. If incomplete proteins are consumed regularly and for a long period, the body cannot synthesize the necessary proteins.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>What Foods Provide Essential Amino Acids?<\/b><\/span><\/p>\n<p class=\"p2\">Except for gelatin, almost all animal sources of protein\u2014such as red meat, poultry, fish, eggs, and dairy products\u2014 are considered complete or high-quality proteins that provide all essential amino acids. Among the mentioned food sources, egg albumin is the most complete protein. Seafood is an excellent source of lean protein and heart-healthy omega-3 fatty acids. For example, just a 3-ounce serving of salmon provides 22.5 grams of complete protein. (1)<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Are Plant Proteins Considered Complete Proteins?<\/b><\/span><\/p>\n<p class=\"p2\">Most plant proteins are not considered complete proteins because one or more essential amino acids are lacking or inadequate in them. Plant-based protein sources\u2014such as quinoa, chia seeds, and hemp seeds\u2014offer a complete set of essential amino acids. Moreover, they are often more easily digestible and have fewer health risks than soy protein, which is another complete protein. Beans, peas, and lentils\u00a0<span class=\"s4\">are also excellent sources of protein. However, they may not provide an adequate amount of one or more essential amino acids. Usually, g<\/span>rains, vegetables, and some seeds are sources of incomplete protein. For example, grains are typically low in lysine, methionine, and cysteine. Corn is low in lysine and tryptophan because concentration of these amino acids declines as the kernels mature. So,\u00a0you usually don&#8217;t get complete protein with one particular type of grain by itself.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>How Can Vegetarians Get Complete Proteins?<\/b><\/span><\/p>\n<p class=\"p2\">People who do not eat animal products can receive enough essential amino acids when they eat a variety of protein-containing foods each day. One cup of lentils provides about 18 grams of protein. One cup of brown rice provides 5.5 grams of protein.<span class=\"s4\">\u00a0Quinoa is a plant-based protein source that contains complete protein and one cup of quinoa contains 8 grams of protein.<\/span>\u00a0Because some foods may be low in one or more amino acids, but higher in other amino acids, two incomplete proteins when eaten together, can complement each other and provide a complete protein. For example, a combination of legumes (beans, peas, lentils, soy) with grains (oats, wheat, quinoa) plus the consumption of a variety of vegetables can make a balanced diet.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>How Much Protein Do You Need?<\/b><\/span><\/p>\n<p class=\"p2\">The National Academy of Medicine recommends that adults get a minimum of 0.8 grams of protein for every kilogram of body weight per day. (2) For a 140-pound (60 Kg.) person, that means about 48 grams of protein each day. For a 200-pound (90 Kg.) person, that means about 72 grams of protein each day. Bodybuilders and athletes need more good quality protein than non-athletes. Protein requirements for different age groups also affect the amount of protein needed in diets. Many people in the U.S. are consuming more than enough protein that they need, especially from animal-based foods.<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Protein Sources Come In A \u201cPackage\u201d<\/b><\/span><\/p>\n<p class=\"p2\">According to the Harvard School of Public Health, when we eat protein foods, we also eat everything that comes alongside it: fats, fiber, sodium, and more. It\u2019s this protein\u00a0\u201cpackage\u201d\u00a0that\u2019s likely to make a difference in health. (2) For example, a 4-ounce broiled sirloin steak is a great source of protein\u2014about 33 grams worth. But it also delivers about 5 grams of saturated fat. A 4-ounce ham steak with 22 grams of protein has only 1.6 grams of saturated fat, but it\u2019s loaded with 1,500 milligrams worth of sodium. On the other hand, salmon and other fatty fish are excellent sources of Omega-3 fats that are good for the heart. A cup of cooked lentils provides about 18 grams of protein and 15 grams of fiber, and it has virtually no saturated fat or sodium. (3)<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Side Effects Of Too Much Protein Consumption<\/b><\/span><\/p>\n<p class=\"p2\">Studies at the Harvard T. H. Chan School of Public Health have found that eating even small amounts of red meat\u2014especially processed red meat\u2014regularly is linked to an increased risk of heart disease.\u00a0(2) People who eat just two servings of red meat per week may have an increased risk of developing type 2 diabetes compared to people who eat fewer servings\u2014the risk increases with greater consumption. Replacing red meat with healthy plant-based protein sources, such as nuts and legumes, or with modest amounts of dairy foods was associated with reduced risk of type 2 diabetes. (4) Excessive consumption of soy products may increase the risk of certain health problems, including breast cancer in women and prostate cancer in men. (5)<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Other Considerations Involving Protein<\/b><\/span><\/p>\n<p class=\"p2\">\u2022\u00a0Specific proteins in food may cause allergies, which are overreactions of the immune system.<br \/>\n\u2022\u00a0Eggs, fish, milk, peanuts, tree nuts, and soybeans can cause allergic reactions in some people.<br \/>\n\u2022\u00a0Individuals diagnosed with certain diseases (such as kidney and liver disease) need to monitor their protein intake according to their physician\u2019s guidelines.<br \/>\n\u2022\u00a0Most worrisome of all, processed meats are considered carcinogenic. Many contain nitrates or nitrites, which studies link to several cancers. Regularly eating processed meats is correlated with an increased risk of colorectal cancer. (2, 5)<\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Summary<\/b><\/span><\/p>\n<p class=\"p2\">Protein is a key part of any diet. All proteins are made of subunits called amino acids. Of the 20 amino acids that make proteins, nine of them are considered essential because the human body cannot synthesize them (or not enough of them), so they must be supplied through the diet. The average person needs about 7 grams of quality protein every day for every 20 pounds of body weight. Most plant-based foods are deficient in at least one essential amino acid and therefore are incomplete protein sources. Because grains and legumes are not deficient in the same amino acids, they can complement each other in a diet. Eating a variety of foods is the key to a healthy and balanced diet because each food has a unique mix of nutrients.<\/p>\n<p class=\"p2\">____________________________________________________<\/p>\n<p class=\"p4\"><span class=\"s1\"><b>Selected References:<\/b><\/span><\/p>\n<p class=\"p5\"><span class=\"s5\">1-\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><span class=\"s6\">https:\/\/www.webmd.com\/fitness-exercise\/good-protein-sources<br \/>\n<\/span><span class=\"s5\">2-\u00a0\u00a0\u00a0\u00a0 <\/span><span class=\"s6\">https:\/\/www.hsph.harvard.edu\/nutritionsource\/what-should-you-eat\/protein\/<br \/>\n<\/span><span class=\"s5\">3-\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><span class=\"s6\">https:\/\/health.clevelandclinic.org\/best-and-worst-sources-of-protein<br \/>\n<\/span><span class=\"s7\">4-\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><span class=\"s6\">https:\/\/www.hsph.harvard.edu\/nutritionsource\/what-should-you-eat\/whole-grains\/<br \/>\n<\/span><span class=\"s5\">5-\u00a0\u00a0\u00a0\u00a0\u00a0https:\/\/pressbooks.calstate.edu\/nutritionandfitness\/chapter\/7-4-dietary-sources-of-protein\/<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Educational Series The Science of Nutrition Protein Quality Matters By Mohammad Ahrar, PhD Introduction Protein is an essential macronutrient, which is necessary for growth, tissue repair, and maintaining health. Almost all foods contain protein, but not all food sources of protein are created equally and you may not need as much protein as you think<\/p>\n","protected":false},"author":2,"featured_media":4005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"two_page_speed":[],"footnotes":""},"categories":[4,68],"tags":[],"class_list":["post-4025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lifestyle","category-mohammad-ahrar-phd"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Protein Quality Matters - Peyk Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/peykmagazine.com\/en\/2024\/05\/05\/protein-quality-matters\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Protein Quality Matters - Peyk Magazine\" \/>\n<meta property=\"og:description\" content=\"Educational Series The Science of Nutrition Protein Quality Matters By Mohammad Ahrar, PhD Introduction Protein is an essential macronutrient, which is necessary for growth, tissue repair, and maintaining health. 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