Athena Vale
Protein is one of the three nutrients, along with fats and carbohydrates, that we need in larger amounts in our diet. It is the building block of our muscles and is essential for muscle growth and repair. Eating adequate amounts of protein can help maintain muscle mass and promote muscle growth during strength training. However, simply eating more protein will not lead to increased muscle growth, and consuming too much protein can lead to weight gain. Instead, muscle growth happens when we exercise, especially with resistance exercises, and when we eat enough protein.
| Characteristics | Values |
|---|---|
| Protein's role in muscle growth | Protein is the building block of muscles and is essential for muscle growth and repair |
| Recommended Dietary Allowance (RDA) | 0.75-0.8 grams of protein per kilogram of body weight |
| RDA for older adults | 1 gram per kilogram of body weight |
| RDA for athletes | 1.2 to 2 grams of protein per kilogram of body weight |
| Protein intake and muscle mass | Increased protein intake contributes to greater muscle mass gains when coupled with resistance exercise, helps preserve muscle mass during weight loss, and limits age-related muscle loss |
| Health risks of excess protein intake | Consuming too much protein may lead to weight gain and can pose other health risks, especially for those with kidney or liver problems |
| Protein-rich foods | Animal foods like meat and fish, and plant sources like soy, quinoa, buckwheat, and Quorn |
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What You'll Learn
The recommended daily protein intake
For older adults aged 65 and above, it is recommended to consume slightly more protein, around 1 gram per kilogram of body weight, as they are more prone to muscle loss and bone fractures. This amount can also vary depending on the person's health and activity level. Physically active individuals, including athletes, may require a higher protein intake to support their training regimen. According to the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine, the recommended protein intake for physically active people is 1.2 to 2 grams of protein per kilogram of body weight.
Additionally, the amount of protein needed to build muscle may differ from the amount required for weight loss or maintenance. For those trying to build muscle, a daily protein intake of 1.5 to 3.5 grams per kilogram of body weight is recommended when paired with resistance training. This higher intake can support muscle growth and strength gains. However, it is important to note that simply increasing protein intake may not lead to significant muscle gains without also incorporating strength training and higher weights into your routine.
While it is essential to consume adequate protein, excessive protein intake can have negative consequences. Consuming too much protein can lead to weight gain and may put strain on the kidneys, especially for individuals with pre-existing kidney conditions. Therefore, it is always recommended to consult with a healthcare provider or registered dietitian to determine the appropriate protein intake based on your individual needs and health status.
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Protein and muscle loss prevention
Adequate protein consumption is critical for maintaining optimal health during normal growth and ageing. Protein is the building block of muscles and eating enough can help maintain muscle mass and promote muscle growth during strength training.
A 2022 review of 74 studies found that the daily protein requirements in grams for increasing lean muscle mass may vary depending on age groups. For instance, the recommended intake for older people over 65 years is 1.2 to 1.59 grams of protein per kilogram of body weight.
Increasing your protein intake is one of the best ways to reduce age-related muscle deterioration and prevent sarcopenia. A study in 2014 found that a diet of at least 30 grams of protein and 3 grams of the branched-chain amino acid leucine per serving triggered anabolism (muscle building) and muscle maintenance in sedentary individuals. Leucine supplementation was also found to help preserve muscle during disuse.
Additionally, multiple studies have shown that protein intake is critical for inactive people to prevent muscle loss. A 2013 study confirmed that muscle disuse, or inactivity, leads to atrophy, or muscle loss. However, the researchers found that maintaining protein intake during a period of disuse prevents muscle atrophy. Therefore, keeping protein intake high prevents muscle loss when you're not training or are training less frequently or less intensely.
It is important to note that the current Recommended Dietary Allowance (RDA) for protein is defined as the minimum amount required to prevent lean body mass loss. However, this has been misrepresented and misinterpreted as a recommended optimal intake. Despite greater awareness of the benefits of higher-protein diets for muscle mass, actual dietary patterns have remained relatively unchanged in American adults.
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Protein-rich foods
Protein is one of the body's key building blocks, supporting cells, organs, and tissues. It is a macronutrient that plays an important role in muscle growth and maintenance. While increased protein intake can contribute to greater muscle mass gains, it is most effective when coupled with strength or resistance training.
Animal Sources:
- Lean meat: Chicken, turkey, beef, and pork are excellent sources of high-quality protein and provide important nutrients like iron and zinc.
- Seafood: Salmon, anchovies, and trout are good choices, offering healthy omega-3 fatty acids and lower levels of methylmercury.
- Dairy products: Greek yogurt, milk, and cheese are rich in protein and calcium. Opt for low-fat options to reduce saturated fat intake.
- Eggs: A large white egg contains around 6 grams of protein and 70 calories.
Plant-Based Sources:
- Legumes: Lentils, chickpeas, and black beans are excellent sources of plant-based protein and provide additional nutrients like fiber, folate, and potassium.
- Nuts and seeds: Almonds, walnuts, peanuts, and sunflower seeds are rich in protein and healthy fats, vitamins, and minerals.
- Soy products: Tofu, soy milk, and edamame beans are good plant-based sources of protein.
It is important to note that while protein is essential for muscle health, a well-rounded diet should include a variety of nutrients. Eating a balanced mix of protein-rich foods ensures that you meet your protein needs while also benefiting from the vitamins, minerals, and other nutrients these foods provide. Additionally, it is important not to overeat protein, as doing so may strain the kidneys and potentially increase the risk of kidney disease.
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Protein supplements
Protein is one of the body's key building blocks, supporting cells, organs, and tissues. It is necessary for a healthy immune system and required for organs like the heart, brain, and skin to function properly. Eating protein can make you feel full for longer, and it may provide many health benefits, including increasing muscle mass, improving bone density, and promoting weight loss.
However, it is important to note that consuming larger quantities of protein supplements than necessary can contribute extra calories and may even reduce muscle-building potential. Therefore, it is recommended to consume 20 to 40 grams of protein at a time, which is roughly the amount found in a can of tuna. It is also worth mentioning that while protein supplements can be beneficial, they are not regulated in the same way as food or medicine, and companies sometimes add potentially unsafe ingredients to their products. As such, it is essential to be cautious and well-informed when considering the use of protein supplements.
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Protein intake for athletes
Protein is a key nutrient for peak performance and is needed for numerous bodily processes, including repairing muscle tissue. It is one of the three macronutrients, along with fats and carbohydrates, and is a building block for muscles.
The current Recommended Dietary Allowance (RDA) for protein is defined as the minimum amount required to prevent lean body mass loss, but is often misrepresented and misinterpreted as a recommended optimal intake. The RDA is 0.8 grams per kilogram of body weight for an average sedentary adult. This is approximately 55 grams of protein per day for someone who weighs 150 pounds. However, physically active individuals should consume more protein than sedentary individuals. The recommended intake for physically active individuals ranges from 1.0 to 2.0 grams per kilogram of body weight, depending on the type of exercise, the individual's age, and the intensity and duration of the exercise. For example, individuals engaging in endurance exercise should consume protein at the lower end of this range, while those engaging in strength or power exercise should consume protein at the upper end. In addition, the timing of protein intake is important, with recommendations suggesting that individuals consume 0.25 to 0.3 grams of high-quality protein per kilogram of body weight within 0 to 2 hours after exercise to increase protein synthesis and muscle building.
It is important to note that consuming more protein than the RDA does not necessarily lead to improved muscle performance or physical function. While increased protein intake can contribute to greater muscle mass gains, it is only when coupled with resistance or strength training. Simply consuming more protein without the accompanying exercise will not lead to increased muscle mass or improved performance.
For athletes, ensuring adequate protein intake is crucial. While it is possible for athletes to obtain their daily protein requirements through a varied, regular diet, supplemental protein can be a practical way to ensure sufficient and quality protein intake. Examples of protein-rich foods include eggs, meat, poultry, and dairy, while protein supplements such as whey protein are also popular.
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Frequently asked questions
Yes, protein is essential for building and maintaining muscle mass. It is one of the three nutrients, along with fat and carbohydrates, that we need in larger amounts in our diet.
The best way to calculate your daily protein needs is by using your weight. A general rule of thumb is to eat about 1.2g of protein per kg of body weight to maintain muscle. This may increase to 1.2-1.6g/kg of body weight when looking to add lean mass.
Yes, protein helps your muscles recover, repair, and regrow, which can contribute to building lean muscle mass. It is especially beneficial when consumed during periods of negative energy balance.
Animal foods such as meat and fish, and certain plant sources like soy, quinoa, buckwheat, and Quorn, contain all the essential amino acids, making them high-quality sources of protein.
