Jeffrey Salazar
Protein is an essential macronutrient that plays a key role in the function and structure of our cells, tissues, and organs. Our bodies are made up of thousands of different proteins, each with a specific function. Eating a diet rich in protein can help reduce appetite and manage hunger levels, strengthen bones, and aid in injury recovery. Protein is also important for growth and development in children, teens, and pregnant women. Essential amino acids, which the body cannot produce, must be supplied by food. These 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.
| Characteristics | Values |
|---|---|
| Functions in the body | Provide structure to cells and tissues, aid in the creation of hormones and enzymes, and help repair and replace old body proteins |
| Sources | Animal sources: meat, milk, fish, eggs, poultry, seafood; Plant sources: soy, beans, legumes, nuts, nut butters, grains (wheat germ, quinoa), peas, hemp, pumpkin seeds, sunflower seeds, alfalfa |
| Health benefits | Increased satiety, lower blood pressure, improved blood lipids, weight loss, stronger bones, improved immune system, reduced appetite, better weight maintenance, improved kidney function (in non-dialysis patients) |
| Daily intake recommendations | 10-35% of total calorie needs (46g for adult females, 56g for adult males according to Dietary Guidelines for Americans 2020-2025) |
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What You'll Learn
Protein helps repair and create new cells
Protein is an essential macronutrient for optimal health. It is a major component of hair, skin, nails, muscles, bones, bodily fluids, and organs. Proteins are often referred to as the building blocks of the body, as they are critical to the growth and repair of cells.
The human body is made up of approximately 100 trillion cells, which are like building blocks that group together to form tissues, organs, and systems. These cells are not all the same, with over 200 different types of cells in the body. For example, bone cells are different from lung cells. When cells die or become damaged, the body generates new cells to replace them.
The protein in food is broken down into amino acids during digestion. Amino acids are the building blocks for many important molecules in the body, including proteins and hormones. There are 20 different types of amino acids, nine of which are considered essential, as the body cannot produce them on its own and must obtain them from food. Essential amino acids include tryptophan and tyrosine, which help make hormones related to sleep and metabolism.
The body uses amino acids to repair damaged cells and create new ones. For example, the Mre11 protein repairs DNA damage caused by radiation or exposure to toxins. It does this by acting as a nuclease, an enzyme that modifies and processes broken DNA ends. The ATM kinase also plays a role in repairing cells by controlling the cell's response to double-strand breaks and slowing cell growth to allow for repairs.
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It can help lower blood pressure
Protein is an essential macronutrient that plays a crucial role in maintaining optimal health. While it is well-known for its role in cell repair and growth, recent studies have also highlighted its potential impact on blood pressure regulation.
The Link Between Protein and Blood Pressure
The relationship between protein intake and blood pressure has been a subject of increasing controversy. While some investigators, particularly from Western countries, initially assumed a direct association between protein intake and elevated blood pressure, recent studies suggest a different picture.
Plant-Based Proteins and Blood Pressure
Recent observational studies and clinical trials have indicated that increased protein intake, especially from plant sources, may contribute to lowering blood pressure. This finding contradicts the traditional view and offers a promising approach to managing blood pressure.
The DASH Diet
The Dietary Approaches to Stop Hypertension (DASH) diet, devised by Thomas Moore, includes plenty of fruits, vegetables, and low-fat dairy products while being lower in saturated fats and salt. The addition of low-fat dairy to a diet rich in fruits and vegetables almost doubled the blood pressure-lowering effect, leading researchers to consider protein's role.
Protein Variety and Blood Pressure
In a study of nearly 12,200 adults in China, consuming protein from a diverse range of sources was linked to a reduced risk of developing high blood pressure. This suggests that a balanced diet with moderate protein intake from various sources may be key to maintaining healthy blood pressure.
In conclusion, while the specific mechanisms require further investigation, current evidence suggests that protein, particularly from plant sources, can play a significant role in helping to lower blood pressure. A well-rounded diet that includes a variety of protein sources may be the most effective approach to supporting cardiovascular health and managing blood pressure.
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Protein is made up of amino acids
Protein is an essential macronutrient for optimal health. It is made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains. There are 20 different types of amino acids that can be combined to make a protein. The sequence of amino acids determines each protein's unique 3-dimensional structure and its specific function.
Amino acids are coded by combinations of three DNA building blocks (nucleotides), determined by the sequence of genes. The human body needs a number of amino acids in large enough amounts to maintain good health. Amino acids are found in animal sources such as meats, milk, fish, and eggs. They are also found in plant sources such as soy, beans, legumes, nut butters, and some grains (e.g. wheat germ and quinoa).
Some proteins are hormones, which are chemical messengers that aid communication between cells, tissues, and organs. They are made and secreted by endocrine tissues or glands and then transported in the blood to their target tissues or organs. Other proteins are enzymes that aid the thousands of biochemical reactions that take place within and outside cells.
The body needs a certain amount of protein to function properly. The daily recommended intake of protein for healthy adults is 10% to 35% of your total calorie needs. One gram of protein supplies four calories.
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It helps manage hunger and cravings
Protein is an essential macronutrient that plays a crucial role in managing hunger and cravings. Firstly, protein helps reduce appetite and manage hunger levels. This is due to its effects on hormones that control hunger and fullness signals in the body. A 2020 review found that protein reduced levels of ghrelin, the "hunger" hormone, while increasing levels of cholecystokinin and glucagon-like peptide-1 (GLP-1), hormones responsible for signalling fullness. By influencing these hormones, protein helps regulate appetite and makes you feel fuller for longer.
Additionally, protein has a higher thermic effect than other macronutrients, meaning it requires more calories to digest, increasing the number of calories burned. This can contribute to weight management and help curb cravings. Research has shown that increasing protein intake can reduce cravings and the desire to snack. For example, a 2010 study found that men who increased their protein intake to 25% of calories reduced their cravings by 60% and had less desire to snack at night. Similarly, a 2014 study on adolescent girls showed that a high-protein breakfast reduced cravings and late-night snacking.
The timing of protein intake also plays a role in managing hunger and cravings. Consuming extra protein at breakfast can help curb appetite later in the day. A small study published in the Journal of Dairy Science in October 2018 found that participants who consumed a high-protein breakfast had lower blood sugar levels and reduced appetite later in the day compared to those who consumed less protein. This suggests that starting the day with a protein-rich meal can help keep cravings at bay and stabilize blood sugar levels.
Furthermore, protein's role in weight management indirectly helps with hunger and cravings. By reducing overall calorie intake and promoting fullness, protein can help with weight loss and maintenance. This is especially beneficial for those who struggle with afternoon cravings or managing their weight. It's important to note that individual protein needs vary based on factors such as age, exercise level, health conditions, and overall dietary patterns. Consulting with a registered dietitian can help determine your specific protein requirements.
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Protein is an essential macronutrient
Protein is necessary for optimal health, and dietary guidelines recommend that adults obtain 10% to 35% of their calories from protein to prevent protein deficiency. The daily recommended intake of protein for healthy adults is 10% to 35% of their total calorie needs, with adult females consuming at least 46 grams and adult males consuming 56 grams per day. The amount of protein required varies depending on factors such as age, exercise level, health conditions, and overall dietary patterns.
Protein-rich foods increase satiety and reduce appetite, making it easier to manage calorie intake. They also play a role in weight loss and weight management, as they help reduce overall calorie intake and prompt weight loss. Additionally, a high-protein diet has been linked to lower blood pressure and improved blood lipids, contributing to overall heart health.
Protein sources vary, and it is important to choose a variety of protein-rich foods to obtain a range of nutrients. Animal sources include meat, milk, fish, and eggs, while plant-based sources include soy, beans, legumes, nuts, seeds, and certain grains like wheat germ and quinoa. Vegetarians and vegans can obtain sufficient protein by consuming a variety of plant-based sources, ensuring they meet their essential amino acid requirements.
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Frequently asked questions
Protein is an essential macronutrient made up of chemical building blocks called amino acids.
Protein is essential for cell and tissue growth and repair, allowing metabolic reactions to take place and coordinating bodily functions. It also helps maintain proper pH and fluid balance, keeping the immune system strong, transporting and storing nutrients, and can act as an energy source.
The recommended daily intake of protein for healthy adults is 10% to 35% of your total calorie needs. The amount of protein you need will depend on your weight, gender, age, health, and activity level.
Good sources of protein include animal products such as chicken, beef, fish, eggs, and dairy products. Plant-based sources of protein include soy, beans, legumes, nut butters, quinoa, and some grains such as wheat germ.
