Logan Steele
Protein is an essential nutrient that plays a vital role in wellness and is important for an array of bodily processes, including making hormones and enzymes. While it is important to consume enough protein, it is also possible to have too much of it. The body does not store protein in the same way it stores fat or carbohydrates, and excess protein is either excreted as urea or converted to fat. The human body breaks down muscle tissue to get certain amino acids, which are the building blocks of protein, and these amino acids can be used for muscle repair and growth. However, the body does not store this protein for later use.
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What You'll Learn
The human body cannot store protein
The human body does not store protein in the same way it stores fat or carbohydrates. While the body can store excess fat and carbohydrates, any excess protein is converted into waste products like urea or ammonia. The body can break down its muscle tissue to get certain amino acids, but it has no specialised cells to store protein efficiently.
Protein is an essential nutrient that plays a vital role in wellness and is required for an array of bodily processes, including making hormones and enzymes. It is also important for repairing and growing muscle tissue. However, the body does not store this macronutrient for later use. The protein we eat from food has to be handled as we eat it. The amino acids in the pool are ready and waiting to be utilised. Either the amino acids are used within a limited time to build a body protein, or they are transformed.
If amino acids are not needed to become a protein, the body is equipped to reconfigure them either back to glucose to be used as energy or into fat. To transform an amino acid, the liver strips off the nitrogen, which may then be incorporated into DNA, RNA, or a non-essential amino acid. Excess nitrogen is incorporated into urea or ammonia, which are excreted in the urine.
While protein is essential for muscle growth and repair, simply consuming more protein will not lead to increased muscle mass. In fact, consuming excessive amounts of protein can be harmful. It can cause an increase in ammonia, which can lead to nausea and an ammonia smell in your sweat. It can also disrupt the body's acid-base balance and increase the amount of calcium excreted in urine, which can lead to osteoporosis. Therefore, it is important to consume protein in moderation and as part of a balanced diet.
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Excess protein is converted to fat
While protein is an essential part of a healthy diet, helping to build and repair muscle, organs, and bones, nutritional experts do not advocate exceeding the recommended amount. The human body cannot store protein, so once its needs are met, any extra protein is used for energy or stored as fat. Excess calories from any source will be stored as fat in the body. Extra protein intake can also lead to elevated blood lipids and heart disease since many high-protein foods are high in total and saturated fat.
Excess protein intake can also have other negative side effects. It can cause dehydration, which is secondary to high urea excretion, and can lead to gout, liver and kidney damage, calcium loss, bloating, and diarrhea. It can also increase your cancer risk and cause digestive issues like nausea and bad breath.
It is important to note that the recommended amount of protein varies depending on individual factors such as gender, age, physical activity level, and fitness goals. For a sedentary adult, the recommended dietary allowance to prevent deficiency is 0.8 grams of protein per kilogram of body weight. However, for athletes or individuals who engage in strength training, the protein requirement may increase to support muscle growth and repair.
While protein supplements are often marketed to enhance physical performance, the efficiency and safety of ingesting large amounts of protein are questioned by health experts. A well-balanced diet that includes a variety of whole grains, vegetables, fruits, and protein-filled foods is generally sufficient to meet the body's protein needs without resorting to excessive supplementation.
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Protein is essential for muscle growth and repair
The amount of protein required depends on several factors, including age, gender, activity level, and health. For example, individuals engaged in intense training require more dietary protein than sedentary individuals. According to the Academy of Nutrition and Dietetics, protein should make up 10 to 35% of daily calories for those engaging in strength-training exercises.
To build muscle, a person must consume more protein than their body breaks down, which is often referred to as a net positive nitrogen balance. If a person does not consume enough protein, their body may break down muscle tissue to obtain the amino acids needed to support bodily functions. This can lead to decreased muscle mass and strength over time.
Complete proteins, which contain a full array of amino acids, are found in animal sources such as meat, poultry, fish, eggs, and dairy. Plant-based proteins are considered incomplete because they lack some essential amino acids. However, individuals on plant-based diets can still obtain sufficient protein by consuming a variety of plant-based protein sources and increasing their overall protein intake.
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Complete protein sources
The human body cannot store protein efficiently, although it can break down muscle tissue to obtain certain amino acids, the building blocks of protein. Therefore, it is important to eat protein regularly and in the right amounts. Excess protein in the diet can be harmful, as the body excretes it as urea through the kidneys, which can lead to kidney malfunction and disrupt the body's acid-base balance.
Complete proteins contain all nine essential amino acids in consistent amounts. Meat, poultry, fish, eggs, and dairy are examples of complete proteins. However, vegetarian and vegan sources of complete proteins are also available, including:
- Quinoa: A pseudocereal with a crunchy texture and nutty flavor that can be used in various recipes.
- Tofu, tempeh, and edamame: Made from soybeans, these are excellent plant-based sources of complete protein.
- Buckwheat: Another pseudocereal that is nutty in flavor and can be cooked like oatmeal or ground into flour for baking.
- Ezekiel bread: Made from sprouted whole grains and legumes, including barley, soybeans, wheat, lentils, millet, and spelt, making it a complete protein.
- Hemp seeds: These seeds, which come from the hemp plant, are a complete protein and a good source of several essential nutrients.
- Spirulina: A type of blue-green algae popular among vegans and vegetarians, providing a complete protein and various other nutrients.
While it is important to consume complete proteins, it is worth noting that a balanced diet of incomplete proteins can also provide all the essential amino acids. Mixing and matching protein sources can ensure that the body receives all the required amino acids, even for those who follow a plant-based diet.
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Protein requirements
The human body does not store protein, and any excess protein is either used for energy or stored as fat. Therefore, it is important to eat protein regularly and in the right amounts. The recommended dietary allowance to prevent deficiency for an average sedentary adult is 0.8 grams of protein per kilogram of body weight. This can go up to 1.7 grams per kilogram for bodybuilders or athletes involved in high-intensity sports. For a relatively active adult, protein intake can be as low as 10% of their total daily calories, while the average American consumes around 16%.
Protein is essential for muscle health and recovery after exercise, and it is important to eat enough protein to support tissue growth and repair muscles. Lack of protein can lead to physical fatigue, weakness, or pain in joints and muscles, and it can also affect immune function and hormones. To maximise muscle growth, it is recommended to have at least 30 grams of protein in your first meal of the day.
It is important to note that consuming too much protein can have negative health effects. Excess protein intake can lead to elevated blood lipids and heart disease, as well as increased stress on the kidneys and liver. It can also disrupt the body's acid-base balance and increase the risk of osteoporosis. Therefore, it is crucial to maintain a balanced diet that includes a variety of whole grains, vegetables, fruits, and protein-filled foods.
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Frequently asked questions
The human body does not have a large storage depot for protein, as it does for carbohydrates and fats. Excess protein is converted to and stored as fat.
Excess protein can throw off your body's nitrogen balance, resulting in a high concentration of amino acids in your urine and excess stress on the kidneys and liver. It can also disrupt the body's acid-base balance and increase the amount of calcium excreted in urine, which can lead to osteoporosis.
If you consume protein too close to exercising, your body will not be able to optimally oxygenate and hydrate your muscles because it needs oxygen and water to metabolize the protein. This can result in a poor training session.
Meat, poultry, fish, eggs, soy, whey, and dairy are complete proteins, meaning they have a complete array of amino acids. Vegetarian sources of protein, including beans, nuts, seeds, and grains, are incomplete sources.
A healthy adult human should consume 0.8 grams of protein per kilogram or per 2 pounds of healthy body weight. Dietary protein should account for 10 to 20 percent of total energy intake.
