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Protein is an essential macronutrient, but not all food sources of protein are created equal, and you may not need as much as you think. Learn the basics about protein and shaping your diet with healthy protein foods.

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What is protein?
How much protein do I need?
Its all about the protein package
Research on protein and human health
Protein foods and the planet
The bottom line: choosing healthy protein foods
[Quiz] Test your protein knowledge!

What Is Protein?

Protein is found throughout the bodyin muscle, bone, skin, hair, and virtually every other body toàn thân part or tissue. It makes up the enzymes that power many chemical reactions and the hemoglobin that carries oxygen in your blood. At least 10,000 different proteins make you what you are and keep you that way.

Protein is made from twenty-plus basic building blocks called amino acids. Because we dont store amino acids, our bodies make them in two different ways: either from scratch, or by modifying others. Nine amino acidshistidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valineknown as theessentialamino acids, must come from food.

How Much Protein Do I Need?

The National Academy of Medicine recommends that adults get a minimum of 0.8 grams of protein for every kilogram of body toàn thân weight per day, or just over 7 grams for every 20 pounds of body toàn thân weight. [1]

The National Academy of Medicine also sets a wide range for acceptable protein intakeanywhere from 10% to 35% of calories each day. Beyond that, theres relatively little solid information on the ideal amount of protein in the diet or the healthiest target for calories contributed by protein. In an analysis conducted Harvard among more than 130,000 men and women who were followed for up to 32 years, the percentage of calories from total protein intake was not related to overall mortality or to specific causes of death. [2] However, the source of protein was important.

What are complete proteins, and how much do I need?

Pure protein, whether derived from plant or animal foods, probably has similar effects on health, although the mix of amino acids can have health implications. Some proteins found in food are complete, meaning they contain all twenty-plus types of amino acids needed to make new protein in the body toàn thân. Others are incomplete, lacking one or more of the nine essential amino acids, which our bodies cant make from scratch or from other amino acids. Animal-based foods (meat, poultry, fish, eggs, and dairy foods) tend to be good sources of complete protein, while plant-based foods (fruits, vegetables, grains, nuts, and seeds) often lack one or more essential amino acid. Those who abstain from eating animal-based foods can eat a variety of protein-containing plant foods each day in order to get all the amino acids needed to make new protein, and also chooseto incorporate complete plant proteins like quinoa and chia seeds.

Its important to note that millions of people worldwide, especially young children, dont get enough protein due to food insecurity. The effects of protein deficiency and malnutrition range in severity from growth failure and loss of muscle mass to decreased immunity, weakening of the heart and respiratory system, and death.

However, its uncommon for healthy adults in the U.S. and most other developed countries to have a deficiency, because theres an abundance of plant and animal-based foods full of protein. In fact, many in the U.S. are consuming more than enough protein, especially from animal-based foods. [3]

Its All About the Protein Package

When we eat foods for protein, we also eat everything that comes alongside it: the different fats, fiber, sodium, and more. Its this proteinpackagethats likely to make a difference for health.

The table below shows a sample of food packages sorted by protein content, alongside a range of components that come with it.

Table: Comparing protein packages

To call out a few examples:

What about protein powders?Powdered protein can come from a variety of sources, includingeggs,milk(e.g., casein, whey), and plants (e.g.,soybeans,peas, hemp). Some protein powders contain protein from multiple sources; for instance, a vegan option might include protein derived from peas, pumpkin seeds, sunflower seeds, and alfalfa. Like other dietary supplements, protein powders are not regulated by the U.S. Food and Drug Administration for safety. They can often contain non-protein ingredients, including vitamins and minerals, thickeners,added sugars,non-caloric sweeteners, and artificial flavoring. If you choose to consume protein powder, it is important to read the nutrition and ingredient labels beforehand, as products may contain unexpected ingredients and large amounts of added sugars and calories.Learn more about protein powders and other workout supplements

Research on Protein and Health

Available evidence indicates that itsthe source of protein (or, the protein package), rather than the amount of protein, that likely makes a difference for our health. You can explore the research related to each disease in the tabs below, but heres the evidence-based takeaway: eating healthy protein sources like beans, nuts, fish, or poultry in place of red meat and processed meat can lower the risk of several diseases and premature death.

Heart disease

Research conducted the Harvard Chan School of Public Health has found that eating even small amounts of red meatespecially processed red meaton a regular basis is linked to an increased risk of heart disease and stroke, and the risk of dying from cardiovascular disease or any other cause. [4-6] Conversely, replacing red and processed red meat with healthy protein sources such as beans, soy foods, nuts, fish, or poultry seems to reduce these risks. One of the reasons why plant sources of protein are related to lower risk of cardiovascular disease compared to protein from red meat and dairy is because of the different types of fat in these protein packages. Plant-based protein sources are more unsaturated, which lowers LDL cholesterolan established risk factor for heart disease. Also, plant sources contain no cholesterol. Other factors are likely to contribute to the lower risk, but this is a key factor.

Diabetes

Again, the source of proteinmatters more than proteinquantitywhen it comes to diabetes risk. Eating more red meat predicts a higher risk of type 2 diabetes, while consuming nuts, legumes, and poultry is related to lower risk.

Cancer

When it comes to cancer, once again, the source of protein seems to matter more than quantity.

Premature death

Bone health

Weight control

The same healthy protein foods that are good choices for disease prevention may also help with weight control. Again, its the source of protein that matters.

Theres no need to go overboard on protein. Though some studies show benefits of high-protein, low-carbohydrate diets in the short term (such as the paleo diet), avoiding fruits and whole grains means missing out on healthful fiber, vitamins, minerals, and other phytonutrients.

Other considerations involving protein

Protein Foods and the Planet

Just as different foods can have differing impacts on human health, they also have differing impacts on the environment. Agriculture is a major contributor of greenhouse gas (GHG) emissions globally, the accumulation of which is driving climate change a rate unprecedented in human history. However, not all foods have an equal impact. Production of animal-based foods tends to have higher GHG emissions than producing plant-based foodsand dairy and especially red meat (particularly beef, lamb, and goat) stand out for their disproportionate impact.Source: World Resources Institute, .wri.org/proteinscorecard

To give you an idea, this scorecard from the World Resources Institute illustrates the differing GHG emissions per gram of protein from both animal and plant-based protein foods. [25] Making just one pound (454 grams) of lamb generates five times more GHGs than making a pound of chickenand around 30 times more than making a pound of lentils. [26] In the U.S. alone, beef accounts for 36% of all food-related GHG emissions. [27] Beyond emissions, its also important to note that food production places an enormous demand upon our natural resources, as agriculture is a major contributor to deforestation, species extinction, and freshwater depletion and contamination.

Learn more about the impacts of different foods on your plate.

Bottom Line

Protein is a key part of any diet. The average person needs about 7 grams of protein every day for every 20 pounds of body toàn thân weight. Because protein is found in an abundance of foods, many people can easily meet this goal. However, not all protein packages are created equal. Because foods contain a lot more than protein, its important to pay attention to what else is coming with it. Thats why the Healthy Eating Plate encourages choosing healthy protein foods.

Choose fish, poultry, beans, and nuts; limit red meat and cheese; avoid bacon, cold cuts, and other processed meats.Explore the Healthy Eating Plate

Building off this general guidance, here are some additional details and tips for shaping your diet with the best protein choices:

Prioritize hearty and savory plant-based preparationsSimple strategies for creating filling, delicious, and even budget-friendly plant-based dishes.

Looking to reduce red and processed meats, but unsure where to start? Here are a few approaches to cutting-back while keeping your meals satiating and flavorful. Simply find your starting point and move forward with the strategies that work for you:

Eat a little less red meat, any way you canAssess how often you eat red meat, and see if one of these strategies can help you find a way to cut back a bit.Swap out red meat for healthier meatsIf youre thinking of a meal that features red meat, see if you can replace it with a better option, like poultry or seafood.Consume less meat, enjoy more varietyThis approach boosts healthy plant-based foods like beans, nuts, whole grains, and other veggies, while still providing ways to incorporate some of your favorite animal-based foods.

Test your protein knowledge!

Ready to see how much you know about protein and healthy protein foods? Try this 10 question quiz to find out:

ReferencesNational Academies of Medicine.Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (Macronutrients).Song M, Fung TT, Hu FB, Willett WC, Longo VD, Chan AT, Giovannucci EL. Association of animal and plant protein intake with all-cause and cause-specific mortality. JAMA internal medicine. 2022 Oct 1;176(10):1453-63.Fehrenbach KS, Righter AC, Santo RE. A critical examination of the available data sources for estimating meat and protein consumption in the USA. Public health nutrition. 2022 Jun;19(8):1358-67.Bernstein AM, Sun Q., Hu FB, Stampfer MJ, Manson JE, Willett WC. Major dietary protein sources and risk of coronary heart disease in women. Circulation. 2010 Aug 31;122(9):876-83.Pan A, Sun Q., Bernstein AM, Schulze MB, Manson JE, Stampfer MJ, Willett WC, Hu FB. Red meat consumption and mortality: results from 2 prospective cohort studies. Archives of internal medicine. 2012 Apr 9;172(7):555-63.Bernstein AM, Pan A, Rexrode KM, Stampfer M, Hu FB, Mozaffarian D, Willett WC. Dietary protein sources and the risk of stroke in men and women. Stroke. 2011 Jan 1:STROKEAHA-111.Preis SR, Stampfer MJ, Spiegelman D, Willett WC, Rimm EB. Dietary protein and risk of ischemic heart disease in middle-aged men. The American journal of clinical nutrition. 2010 Sep 29;92(5):1265-72.Halton TL, Willett WC, Liu S, Manson JE, Albert CM, Rexrode K, Hu FB. Low-carbohydrate-diet score and the risk of coronary heart disease in women. New England Journal of Medicine. 2006 Nov 9;355(19):1991-2002.Appel LJ, Sacks FM, Carey VJ, Obarzanek E, Swain JF, Miller ER, Conlin PR, Erlinger TP, Rosner BA, Laranjo NM, Charleston J. Effects of protein, monounsaturated fat, and carbohydrate intake on blood pressure and serum lipids: results of the OmniHeart randomized trial. JAMA. 2005 Nov 16;294(19):2455-64.Jenkins DJ, Wong JM, Kendall CW, Esfahani A, Ng VW, Leong TC, Faulkner DA, Vidgen E, Greaves KA, Paul G, Singer W. The effect of a plant-based low-carbohydrate (Eco-Atkins) diet on body toàn thân weight and blood lipid concentrations in hyperlipidemic subjects. Archives of internal medicine. 2009 Jun 8;169(11):1046-54.Lagiou P, Sandin S, Lof M, Trichopoulos D, Adami HO, Weiderpass E. Low carbohydrate-high protein diet and incidence of cardiovascular diseases in Swedish women: prospective cohort study. BMJ. 2012 Jun 26;344:e4026.Pan A, Sun Q., Bernstein AM, Schulze MB, Manson JE, Willett WC, Hu FB. Red meat consumption and risk of type 2 diabetes: 3 cohorts of US adults and an updated meta-analysis. The American journal of clinical nutrition. 2011 Aug 10;94(4):1088-96.Pan A, Sun Q., Bernstein AM, Manson JE, Willett WC, Hu FB. Changes in red meat consumption and subsequent risk of type 2 diabetes mellitus: three cohorts of US men and women. JAMA internal medicine. 2013 Jul 22;173(14):1328-35.Pan A, Sun Q., Bernstein AM, Manson JE, Willett WC, Hu FB. Changes in red meat consumption and subsequent risk of type 2 diabetes mellitus: three cohorts of US men and women.JAMA internalmedicine. 2013 Jul 22;173(14):1328-35.Halton TL, Liu S, Manson JE, Hu FB. Low-carbohydrate-diet score and risk of type 2 diabetes in women. The American journal of clinical nutrition. 2008 Feb 1;87(2):339-46.Åkerblom HK, Vaarala O, Hyöty H, Ilonen J, Knip M. Environmental factors in the etiology of type 1 diabetes. American journal of medical genetics. 2002 May 30;115(1):18-29.Vaarala O, Ilonen J, Ruohtula T, Pesola J, Virtanen SM, Härkönen T, Koski M, Kallioinen H, Tossavainen O, Poussa T, Järvenpää AL. Removal of bovine insulin from cows milk formula and early initiation of beta-cell autoimmunity in the FINDIA pilot study. Archives of pediatrics & adolescent medicine. 2012 Jul 1;166(7):608-14.Bouvard V, Loomis D, Guyton KZ, Grosse Y, El Ghissassi F, Benbrahim-Tallaa L, Guha N, Mattock H, Straif K. Carcinogenicity of consumption of red and processed meat. The Lancet Oncology. 2015 Dec 1;16(16):1599-600.Farvid MS, Cho E, Chen WY, Eliassen AH, Willett WC. Adolescent meat intake and breast cancer risk. International journal of cancer. 2015 Apr 15;136(8):1909-20.Darling AL, Millward DJ, Torgerson DJ, Hewitt CE, Lanham-New SA. Dietary protein and bone health: a systematic review and meta-analysis. The American journal of clinical nutrition. 2009 Nov 4;90(6):1674-92.Mozaffarian D, Hao T, Rimm EB, Willett WC, Hu FB. Changes in diet and lifestyle and long-term weight gain in women and men. New England Journal of Medicine. 2011 Jun 23;364(25):2392-404.Smith JD, Hou T, Ludwig DS, Rimm EB, Willett W, Hu FB, Mozaffarian D. Changes in intake of protein foods, carbohydrate amount and quality, and long-term weight change: results from 3 prospective cohorts. The American journal of clinical nutrition. 2015 Apr 8;101(6):1216-24.Li SS, Kendall CW, de Souza RJ, Jayalath VH, Cozma AI, Ha V, Mirrahimi A, Chiavaroli L, Augustin LS, Blanco Mejia S, Leiter LA. Dietary pulses, satiety and food intake: A systematic review and meta‐analysis of acute feeding trials. Obesity. 2014 Aug;22(8):1773-80.Food and Drug Administration. FDAs Strategy on Antimicrobial Resistance Questions and Answers.://.fda.gov/animalveterinary/guidancecomplianceenforcement/guidanceforindustry/ucm216939.htm.Accessed on 11/6/2022.World Resources Institute.Protein Scorecard.://.wri.org/resources/data-visualizations/protein-scorecard. Accessed on 11/6/2022.Culinary Institute of America and Harvard T.H. Chan School of Public Health.Menus of Change: 2022 Annual Report.://.menusofchange.org/Heller MC, Keoleian GA. Greenhouse gas emission estimates of US dietary choices and food loss. Journal of Industrial Ecology. 2015 Jun;19(3):391-401.Guasch-Ferré M, Satija A, Blondin S, Janiszewski M, Emlen E, OConnor L, Campbell W, Hu F, Willett W, Stampfer M. Meta-Analysis of Randomized Controlled Trials of Red Meat Consumption in Comparison With Various Comparison Diets on Cardiovascular Risk Factors. Circulation. 2022 Apr 1;139(15):1828-45.
*Disclosures: Dr. Hu has received research tư vấn from the California Walnut Commission. Dr. Campbell reported receiving research tư vấn from the National Institutes of Health (T32 Fellowship for Lauren OConnor), the American Egg Board The Egg Nutrition Center, The Beef Checkoff Program, The National Dairy Council, The Pork Checkoff Program, and the Barilla Group. Dr. Campbell also reported serving on the 2015 Dietary Guidelines Advisory Committee. Dr. Satija is an employee of Analysis Group, Inc. The other authors declare no conflicts.

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