Leena Watts
Protein is an essential macronutrient that is used as a building block for bones, muscles, cartilage, skin, and blood. It is made from amino acids, which are essential to many bodily functions, and can be found in animal sources such as meats, milk, fish, and eggs, as well as plant sources such as soy, beans, legumes, nuts, and grains. The amount of protein you need in your diet depends on your calorie needs, age, sex, height, weight, and physical activity. Eating a high-protein diet can help with weight loss and muscle building, but too much protein can be stored as fat or make existing health conditions worse.
| Characteristics | Values |
|---|---|
| What is protein? | An essential [macro]nutrient, one of the building blocks of life. |
| What is it used for? | Supporting cells, organs, and tissues. |
| Repairing cells and making new ones. | |
| Growth and development in children, teens, and pregnant women. | |
| Building bones and muscles. | |
| Preventing muscle loss. | |
| Weight loss and weight management. | |
| Reducing appetite and cravings. | |
| Boosting metabolic rate. | |
| Where can you get it from? | Animal sources: meat, poultry, dairy products, fish, and eggs. |
| Plant sources: beans, peas, legumes, nuts, nut butters, seeds, soy, and some grains (e.g. wheat germ and quinoa). | |
| How much do you need? | The daily recommended intake of protein for healthy adults is 10% to 35% of your total calorie needs. |
| Adult females are recommended to consume at least 46 grams (g) of protein per day, and adult males 56 grams. |
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What You'll Learn
Protein is an essential macronutrient
Protein is important for several reasons. Firstly, it helps repair cells and create new ones, which is especially crucial for the growth and development of children, adolescents, and pregnant women. Secondly, protein supports weight loss and weight management by reducing appetite and managing hunger levels. This is achieved by decreasing the "hunger" hormone, ghrelin, and increasing the body's basal metabolic rate (BMR), or the number of calories burned while performing basic functions.
However, it is important to note that not all protein sources are equal. While animal sources provide a complete package of amino acids, they can also contain high levels of saturated fat and sodium, especially processed meats. Therefore, it is recommended to limit the intake of red meat, cheese, bacon, and processed meats, while opting for leaner animal sources like poultry, fish, and low-fat dairy. Plant-based proteins, on the other hand, are considered healthier and more sustainable. Legumes, nuts, seeds, whole grains, and other plant sources are encouraged as they provide a good balance of nutrients and support overall health.
The amount of protein required varies depending on age, sex, physical activity levels, and individual calorie needs. The daily recommended intake for healthy adults is 10-35% of their total calorie needs, which equates to about 46 grams for adult females and 56 grams for adult males, according to the Dietary Guidelines for Americans. It is important to note that a low-protein diet is generally only advised for people with specific health conditions, such as chronic kidney disease. Consulting with a registered dietitian can help individuals determine their specific protein needs and incorporate sufficient protein into their diet.
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Protein is made up of amino acids
Protein is an essential macronutrient that is found throughout the body. It is present in muscles, bones, skin, hair, and virtually every other body part or tissue. Proteins are complex molecules that do most of the work in cells and are important for the structure, function, and regulation of the body. They are the building blocks of life, and every cell in the human body contains protein.
The human body needs a sufficient amount of certain amino acids to maintain good health. Essential amino acids cannot be made by the body and must be supplied by food. They are found in animal sources such as meat, milk, fish, and eggs, as well as plant sources like soy, beans, legumes, nut butters, and some grains (e.g. wheat germ and quinoa). It is important to note that not all protein "packages" are equal, and the foods we eat contain a lot more than just protein. Therefore, it is crucial to pay attention to what else comes with the protein source.
To ensure a healthy diet, it is recommended to choose plant-based proteins whenever possible. Eating legumes (beans and peas), nuts, seeds, whole grains, and other plant-based sources of protein is beneficial for one's health and the planet. If most of your protein comes from plants, it is important to mix up the sources to ensure that no "essential" components of protein are missing. For those who are not vegetarian or vegan, animal-based proteins can be incorporated, but it is advised to limit red meat and choose leaner varieties of meat and poultry.
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Protein helps repair and build cells
Protein is an essential macronutrient that is found throughout the body, in muscles, bones, skin, hair, and virtually every other body part or tissue. It is a key building block for our bodies and plays an important role in supporting our cells, organs, and tissues. Every cell in the human body contains protein.
Protein is necessary for repairing and building cells because it provides the body with the amino acids it needs to carry out these processes. Amino acids are the building blocks of proteins, and proteins are the building blocks of cells. When we eat protein-rich foods, the protein is broken down into amino acids during digestion, which can then be used by the body to repair and build new cells.
Amino acids are found in both animal and plant sources. Animal sources of amino acids include meats, milk, fish, and eggs. Plant sources include soy, beans, legumes, nut butters, and some grains such as wheat germ and quinoa. It is important to pay attention not only to the protein content of foods but also to what else they contain. For example, nuts are a good source of protein but are also high in fat, so portion sizes should be mindful.
By including a variety of protein-rich foods in our diets, we can ensure that our bodies have the amino acids they need to repair and build cells, as well as support overall health and well-being.
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Protein-rich foods
Protein is an essential macronutrient that is important for many bodily functions. It is a building block for cells and helps to maintain muscle mass. It is also important for growth and development, especially in children, teens, and pregnant women.
Animal-Based Protein Sources:
- Meat: Lean meats such as chicken, turkey, beef, and pork are excellent sources of high-quality protein. They also provide important nutrients like iron and zinc.
- Poultry: Chicken and turkey are good sources of animal protein.
- Seafood: Salmon, anchovies, and trout are healthy options that are high in omega-3 fatty acids and low in methylmercury.
- Dairy: Milk, cheese, and yogurt are rich in protein and other essential nutrients like calcium. Greek yogurt, in particular, is a great option as it has a high protein content.
- Eggs: A large egg contains a good amount of protein and nutrients and can be prepared in a variety of ways.
Plant-Based Protein Sources:
- Beans: Black beans, kidney beans, chickpeas, and soybeans are excellent sources of plant-based protein and also provide fiber and other nutrients.
- Peas: Green peas are high in protein, fiber, and other nutrients. They are versatile and can be used in a variety of recipes.
- Lentils: Lentils are among the richest sources of plant-based protein and are loaded with nutrients like fiber, folate, magnesium, and potassium.
- Nuts: Almonds, hazelnuts, walnuts, peanuts, and pistachios are excellent sources of healthy fats and protein. They make a calorie-dense, protein-rich snack that can help you stay full for longer.
- Seeds: Pumpkin seeds, sunflower seeds, and chia seeds are high in protein and provide healthy fats, vitamins, and minerals.
- Soy and quinoa: These are complete sources of vegetarian protein, meaning they contain all the essential amino acids.
It is important to note that not all protein "packages" are equal. While red meat provides high-quality protein, it can also contain unhealthy amounts of saturated fat and sodium. Therefore, it is recommended to choose leaner meats and include a variety of plant-based protein sources in your diet.
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Weight loss and weight management
Protein is an essential part of a balanced diet and can be a key component of a weight loss journey. Eating protein can make you feel full for longer, reducing your appetite and managing your hunger levels. This means you may be able to consume fewer calories, which is crucial for weight loss. Research shows that people who ate high-protein diets went longer between meals and ate less at meals.
Protein can also help to reduce the buildup of harmful fats in your body, especially around your belly. This is because protein takes longer to digest than other types of nutrients. A high protein diet can also be an effective obesity prevention strategy. By permanently increasing your protein intake, you tip the “calories in versus calories out” balance in your favour. Over months, years, or decades, the difference in your waistline could be huge.
Protein is also the building block of your muscles. Eating adequate amounts can help maintain muscle mass and promote muscle growth during strength training. This can be especially beneficial for older people, as protein can help prevent muscle loss during weight loss. A 2021 study found that a high protein intake is associated with less belly fat in older men, although this may not apply to all populations.
To determine your daily protein intake for weight loss, it is recommended to aim for 30% of your total calorie intake or 0.7 to 1 gram of protein per pound of body weight. For athletes and heavy exercisers, this recommendation may be between 1 to 1.5 grams of protein per pound of their goal weight. It is important to note that this may vary depending on the type and intensity of activity, as well as your physical activity level and medical history.
Some examples of high-protein foods include lean meats, yoghurt, beans, fish, nuts, eggs, cottage cheese, milk, and nut butters.
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Frequently asked questions
Protein is one of the essential macronutrients that our body needs to function. It is the building block of bones, muscles, cartilage, skin, and blood. Protein helps repair cells and create new ones, which is especially important for the growth and development of children, teens, and pregnant women.
Good sources of protein include meat, poultry, seafood, eggs, beans, peas, lentils, nuts, seeds, and soy products. If you are vegetarian or vegan, you can get all the protein you need from plant-based sources such as beans, peas, nuts, seeds, and soy products.
The amount of protein you need depends on your age, sex, height, weight, physical activity, and overall calorie needs. The daily recommended intake of protein for healthy adults is 10% to 35% of your total calorie needs, which is approximately 46 grams for adult females and 56 grams for adult males.
Eating a high-protein diet can help with weight loss and reducing cravings by increasing your metabolic rate and keeping you fuller for longer. Protein is also important for muscle building and preventing muscle loss as we age.
