Madeleine Hull
Protein is an essential macronutrient that plays a key role in the function and structure of our cells, tissues, and organs. It is made from twenty-plus basic building blocks called amino acids, which are found in both animal and plant sources. While animal sources such as meats, milk, fish, and eggs are popular sources of protein, one can also get all the protein they need from plant-based sources such as soy, beans, legumes, nuts, and some grains. The recommended dietary allowance to prevent deficiency for an average sedentary adult is 0.8 grams of protein per kilogram of body weight. However, individual protein needs may vary, and a registered dietitian can help determine the optimal amount for one's specific needs.
| Characteristics | Values |
|---|---|
| Is protein essential? | Yes, protein is an essential macronutrient. |
| What is protein made of? | Protein is made from twenty-plus basic building blocks called amino acids. |
| What are the different types of amino acids? | Essential amino acids, non-essential amino acids, and conditional amino acids. |
| What are essential amino acids? | Essential amino acids cannot be made by the body and must be supplied by food. |
| What are non-essential amino acids? | Non-essential amino acids are made by the body from essential amino acids or the normal breakdown of proteins. |
| What are conditional amino acids? | Conditional amino acids are needed in times of illness and stress. |
| What are some sources of protein? | Animal sources: meats, milk, fish, and eggs. Plant sources: soy, beans, legumes, nut butters, and some grains (e.g. wheat germ and quinoa). |
| What are some high-protein foods? | Animal sources: chicken, turkey, lean cuts of beef or pork. Plant sources: legumes (beans and peas), nuts, seeds, and whole grains. |
| What are the benefits of eating protein? | Eating protein can help with weight management, lower blood pressure, and contribute to building lean muscle mass |
| What are the risks of not eating enough protein? | Not getting enough protein can lead to health issues such as tissue breakdown and muscle loss. |
| What are the risks of eating too much protein? | Excessive protein intake can lead to weight gain as the body stores excess protein as fat. It can also be harmful to those with chronic kidney disease. |
| What is the recommended daily intake of protein? | The recommended daily intake of protein for healthy adults is 10% to 35% of their total calorie needs, which equates to about 0.8 grams per kilogram of body weight. |
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What You'll Learn
What are proteins and why are they important?
Protein is an essential macronutrient that plays a critical role in the human body. It is a fundamental building block, supporting the function and structure of cells, tissues, and organs. At least 10,000 different types of proteins are found throughout the body, from muscles and bones to skin and hair. Proteins are also responsible for making enzymes that facilitate chemical reactions and hemoglobin, which carries oxygen in the blood.
Proteins are made up of amino acids, which are organic compounds composed of nitrogen, carbon, hydrogen, and oxygen. There are twenty or more types of amino acids that are essential for the human body to function properly. Some amino acids, known as nonessential amino acids, can be produced by the body itself, while others, called essential amino acids, must be obtained from food. Animal sources, such as meat, milk, fish, and eggs, are rich in amino acids. However, plant-based sources, including soy, beans, legumes, nuts, and certain grains like quinoa, also provide a good amount of amino acids.
The human body cannot store excess protein, so it is important to consume adequate amounts regularly. The recommended daily intake of protein for healthy adults is 10% to 35% of their total calorie needs, which equates to about 0.8 grams of protein per kilogram of body weight. For example, an individual weighing 165 pounds (75 kilograms) should aim for around 60 grams of protein per day. This can be achieved by including a variety of protein-rich foods in the diet, such as dairy, meat, beans, lentils, soy, or seafood. Spreading out protein consumption throughout the day is also beneficial, with recommendations suggesting 15-30 grams of protein at each meal.
Protein is particularly important for individuals with chronic kidney disease, as it can help support kidney function. Additionally, for those trying to lose weight, increasing protein intake can help manage hunger and cravings, leading to reduced calorie consumption. It is important to note that while protein is essential, excessive intake can lead to the body storing the excess as fat. Therefore, it is recommended to consult with a healthcare professional or a dietitian to determine one's individual protein needs, especially for those with specific health conditions or fitness goals.
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How much protein do I need?
Protein is an essential macronutrient that provides energy to the human body. It is responsible for the proper structure and function of tissues and organs, and it also helps regulate them. It is found throughout the body in muscles, bones, skin, hair, and virtually every other body part or tissue.
The amount of protein you need depends on your overall calorie needs. The recommended dietary allowance (RDA) for protein is 0.8 grams of protein per kilogram of body weight, or 0.36 grams per pound. This is the minimum amount needed to keep from getting sick, not the specific amount you are supposed to eat every day. For example, a person who weighs 165 pounds, or 75 kilograms, should consume 60 grams of protein per day. The RDA for pregnant women is higher, ranging from 75 to 100 grams of protein per day.
If you exercise regularly, your protein needs may increase to about 1-1.5 grams per kilogram or 75-112 grams per day for a 165-pound person. People who regularly lift weights or are training for a running or cycling event may need up to 1.7 grams per kilogram. It is recommended to consume 15-30 grams of protein at each meal, and it is beneficial to space out your protein consumption throughout the day.
Protein can be obtained from both animal and plant-based sources. Animal sources include meat, poultry, fish, eggs, and dairy products, while plant-based sources include soy, beans, legumes, nuts, seeds, and some grains such as wheat germ and quinoa. It is important to note that not all food sources of protein are equal, and it is recommended to choose protein sources that are low in saturated fat and processed carbohydrates and rich in other nutrients.
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What are the best sources of protein?
Protein is an essential macronutrient that is vital for maintaining overall health and well-being. It is made up of amino acids, nine of which are essential, meaning the body needs them but cannot produce them on its own. These essential amino acids must, therefore, be supplied by food. Animal sources of protein, such as meat, eggs, and milk, as well as soy and quinoa, are called complete proteins, meaning they contain all the essential amino acids. However, you can also get essential amino acids from plant-based foods.
Animal Sources
- Lean meats such as chicken, turkey, beef, and pork are excellent sources of high-quality protein and important nutrients like iron and zinc. Turkey and chicken are best served with the skin removed.
- Fish is an excellent source of protein and provides several important vitamins and minerals, like iodine, selenium, and vitamin B12. Fatty fish like salmon and herring are high in omega-3 fats, which have benefits for heart health.
- Dairy products like milk, cheese, and yogurt are rich in protein, calcium, and other essential nutrients. Greek yogurt, in particular, is high in protein and nutrients such as calcium, vitamins, and minerals. Low-fat dairy options are preferable, and it is recommended to limit the amount of cheese consumed due to its high saturated fat content.
- Eggs are a complete protein source, containing all the essential amino acids, as well as vitamins, minerals, healthy fats, and antioxidants.
Plant Sources
- Beans, peas, and lentils are excellent sources of plant-based protein, as well as fiber, folate, potassium, iron, and zinc. Examples include kidney beans, pinto beans, black beans, lima beans, and chickpeas.
- Nuts and seeds, such as almonds, pistachios, cashews, walnuts, hazelnuts, peanuts, chia seeds, pumpkin seeds, and sunflower seeds, are rich in protein, healthy fats, vitamins, and minerals. Nut butters, including peanut butter and almond butter, are also good sources of protein.
- Quinoa is a plant-based complete protein source. A cup of cooked quinoa provides about 8 grams of protein and 5 grams of fiber, along with minerals like manganese, phosphorus, and copper.
- Soy products such as tofu and tempeh are good sources of protein, especially for those who follow a vegetarian or vegan diet.
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What happens if I don't eat enough protein?
Protein is an essential macronutrient that provides structure and support to cells and protects the body from viruses and bacteria. It is found throughout the body in muscle, bone, skin, hair, and virtually every other body part or tissue.
Protein deficiency is uncommon in the United States and is more common in older adults and those with certain diseases. However, if you don't eat enough protein, you may experience some negative health effects. One of the most common signs of protein deficiency is swelling, especially in the abdomen, legs, feet, and hands. This is called edema, and it occurs due to low levels of albumin, a protein that helps keep fluid from building up in tissues.
Protein deficiency can also cause changes in your skin and hair, such as paler, drier, or flakier skin, and brittle, easily breakable hair. You may also experience hair loss, graying, or telogen effluvium, a condition that leads to excessive hair shedding. Additionally, a lack of protein can lead to a weak immune system, as protein helps make antibodies that protect against infection and illness.
Not consuming enough protein can also result in muscle loss and weak bones. This is because protein is crucial for building and maintaining muscle mass, and as we age, our bodies become less efficient at utilizing protein for this purpose.
It is important to note that the amount of protein you need depends on factors such as age, activity level, and overall health. Experts recommend a daily intake of at least 0.36 grams of protein per pound of body weight (0.8 grams per kg), but this may vary depending on individual needs.
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What are the benefits of eating more protein?
Protein is an essential macronutrient that serves as the building block for all our cells, including our organs, bones, muscles, and skin. It is made from twenty-plus basic building blocks called amino acids, which are found in both animal and plant sources.
There are many benefits to eating more protein. Firstly, it can help reduce your appetite and manage your hunger levels, leading to better weight management. This is because protein affects several hormones that control hunger and fullness signals in your body. For example, a 2010 study found that increasing protein to 25% of calories reduced cravings by 60% and the desire to snack at night by half.
Secondly, protein is important for bone health. Many studies indicate that protein, including animal protein, has major benefits for bone density. This is especially important as you age, as protein intake combined with resistance training can help maintain bone mass and lower the risk of osteoporosis and bone fractures.
Thirdly, protein is essential for muscle growth and repair. It provides the body with the amino acids needed to build and maintain muscle tissue, and it also helps to increase muscle strength and size when combined with resistance training.
Finally, protein is important for overall health and well-being. It can help to improve energy levels, support the immune system, and promote healthy hair and skin. Eating a variety of protein-rich foods ensures that you get all the essential amino acids your body needs to function optimally.
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Frequently asked questions
Yes, protein is an essential macronutrient that plays a key role in the function and structure of your cells, tissues, and organs. It is made up of amino acids, which cannot be produced by the body and must be supplied by food.
Good sources of protein include animal products such as meat, milk, fish, and eggs. Plant-based sources of protein include legumes (beans and peas), nuts, seeds, soy, and whole grains.
The recommended amount of protein varies depending on age, sex, and activity level. The Dietary Guidelines for Americans recommend that adult women consume at least 46 grams of protein per day, while adult men should consume 56 grams. For sedentary adults, the recommended amount is 0.8 grams of protein per kilogram of body weight.
