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Protein is a crucial macronutrient that plays a vital role in the human body. It is a major building block for muscles, skin, hair, and nails. It is also essential for producing enzymes, hormones, neurotransmitters, and antibodies. While protein deficiency is uncommon in Western societies, it can lead to various health issues, including muscle weakness. When the body does not get enough protein, it starts to break down muscle tissue to meet its protein needs, leading to muscle wasting and weakness. This can cause a decrease in strength, balance, and metabolism. Additionally, protein deficiency can lead to fatigue, hair loss, edema, and increased susceptibility to infections.
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What You'll Learn
Muscle wasting and loss
Protein is a crucial macronutrient that serves as the building block for muscle tissue. It is composed of amino acids, which are essential for muscle growth and repair. When an individual does not consume enough protein, it can lead to muscle wasting and loss over time. This occurs because the body takes protein from skeletal muscles to preserve more vital tissues and functions.
Causes of Muscle Wasting and Loss
The primary cause of muscle wasting and loss is a lack of adequate protein intake. This can be due to several factors, including dietary restrictions, malabsorption issues, or simply not consuming enough protein-rich foods. Certain medical conditions, such as inflammatory bowel diseases, liver disorders, and kidney problems, can also contribute to reduced protein absorption or increased protein loss.
Symptoms of Muscle Wasting and Loss
The most prominent symptom of muscle wasting and loss is a noticeable decrease in muscle mass. This can lead to overall weakness, as muscles are essential for maintaining strength and balance. Individuals may experience muscle pain and joint discomfort as a result of muscle wasting. Other symptoms include fatigue, reduced energy levels, and a decreased ability to perform physical activities, especially in older adults.
Prevention and Treatment
To prevent and treat muscle wasting and loss, it is essential to ensure adequate protein intake. The recommended daily intake of protein is approximately 0.8 grams per kilogram of body weight, but this may vary depending on age, activity level, and overall health. Spreading protein consumption throughout the day is crucial, as the body cannot store protein. High-protein foods such as fatty fish, lean meats, eggs, lentils, legumes, nuts, and low-fat dairy can help meet protein requirements. Additionally, incorporating muscle-strengthening exercises can help sustain and improve muscle mass and physical function.
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Joint pain
A lack of protein can cause joint pain and muscle weakness. Brown University research has shown that protein plays a pivotal role in the synovial fluid that surrounds joints, preventing them from wear and tear. When dietary protein is lacking, the body pulls from its reserves in both the muscles and joints, resulting in muscle and joint pain.
Protein is critical for building and rebuilding muscle tissue, so it makes sense that a deficiency would cause muscle pain. In addition, your body's blood proteins and blood pressure can plummet when you're not getting enough protein.
Certain proteins, such as cytokines, disintegrins, and proteases, can irritate cartilage cells, leading to inflammation and continuous joint pain. However, inflammatory proteins are counteracted by anti-inflammatory proteins, which help alleviate joint pain. The alpha-2-macroglobulin (A2M) protein, for example, combats harmful chemicals, proteins, and enzymes that cause inflammation and tissue erosion around the joints.
Low protein intake can also cause edema, or swelling, due to fluid retention. This can affect the joints and cause pain.
For older adults, a loss of muscle mass and function is called sarcopenia, which can lead to weak bones, joint stiffness, and overall frailty. Studies suggest that adults start losing muscle mass around age 30, and this process accelerates after 50. Middle-aged men, in particular, may experience sarcopenia and subsequent muscle loss if they don't consume enough protein.
Additionally, a study of middle-aged and older Korean adults found that low protein intake (0.8 g/kg/day) was associated with a higher probability of low back pain in women. The American Physical Therapy Association recommends strengthening exercises and progressive walking for older patients with low back pain, as regular exercise may help relieve pain and prevent further damage.
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Weakness and fatigue
Protein is essential for muscle strength and overall energy levels. A lack of protein can lead to muscle wasting and weakness, as the body breaks down muscle tissue to meet its protein needs. This can result in a decrease in muscle mass and strength, making it harder to perform daily tasks and maintain balance.
When the body doesn't get enough protein, it can lead to a condition called anemia, where the body's cells don't get enough oxygen, resulting in fatigue and tiredness. Protein is also crucial for producing neurotransmitters that regulate mood and energy levels. A deficiency in protein can cause mood changes and mental fog, further contributing to feelings of fatigue.
Additionally, protein is necessary for repairing body tissues and maintaining physical function, especially in older adults. A diet lacking in protein can slow down wound healing and lead to progressive degenerative changes in multiple joints, impacting overall mobility and energy expenditure.
The recommended daily intake of protein is approximately 0.36-0.8 grams per pound of body weight, depending on age, activity level, and overall health. However, athletes and older adults may require a higher protein intake to sustain muscle mass and prevent weakness and fatigue.
To prevent protein deficiency and its associated symptoms, it is important to include protein-rich foods in the diet, such as eggs, lean meats, fish, legumes, and nuts.
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Anaemia and slower metabolism
A lack of protein can cause muscle weakness. When the body does not get enough protein from the diet, it tends to take protein from the skeletal muscles to preserve more important tissues and body functions. This can lead to muscle wasting and loss of muscle mass over time, which in turn cuts strength and balance.
Anaemia is a prevalent form of nutritional deficiency, with 50% of cases attributed to iron deficiency. Iron deficiency can impair skeletal muscle metabolism and is associated with slower metabolism. Iron deficiency anaemia (IDA) is particularly common in patients with type 2 diabetes mellitus, especially those with nephropathy. ID and IDA can impair glucose homeostasis in animals and humans, negatively affecting glycemic control and predisposing diabetic patients to further complications.
Physicians treating IDA should be aware of its negative effect on glycemic control in normal and diabetic patients (both type 1 and type 2). They should aim to prevent ID and treat IDA early to avoid these complications. While the clinical relevance of the effect of iron deficiency on glucose metabolism is still unclear, studies have revealed important consequences of ID and IDA on glucose levels, HbA1c, and insulin secretion.
Low metabolism, or low basal metabolic rate, leads to low energy expenditure. This can result in weight gain as the extra energy is converted into fat and stored in the body. Low metabolism has been linked to both genetic and environmental factors, including nutrient deficiencies such as iron deficiency.
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Stress fractures
While there is some evidence that a lack of protein can cause muscle weakness, there is also a link between protein deficiency and stress fractures. Bones are made up of proteins, and a deficiency can cause bone tissue to weaken, leading to stress fractures.
Athletes of all genders often strive for the perfect" racing weight, which can lead to disordered eating and severe calorie restriction. In women, this can cause hormone disturbances, which affect bone density and increase the risk of stress fractures.
To prevent stress fractures, it is important to identify and address modifiable causes and risk factors, such as nutritional deficiencies. A prolonged lack of vitamin D, for example, is a well-documented risk factor for stress fractures, as it is needed to absorb the minerals required for strong bones. Similarly, vitamin K works with vitamin D to regulate bone health and prevent bone loss. Calcium is another critical mineral for bone health, and a lack of it can cause bones to weaken and break more easily.
A study of young female cross-country runners found that higher intakes of skim milk, dairy products, calcium, vitamin D, and protein were associated with greater bone gains and a lower risk of stress fractures. A dietary pattern of high dairy and low-fat intake was associated with a 68% reduction in stress fracture incidence.
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Frequently asked questions
Yes. When the body doesn't get enough protein from food, it breaks down its muscle tissue for energy, leading to muscle wasting, weakness, and fatigue.
Other symptoms include hair loss, dry skin, increased infections, increased hunger, edema, and joint pain.
The amount of protein needed per day varies depending on factors such as age, level of physical activity, and fitness goals. The Dietary Guidelines for Americans 2020-2025 recommends adult females consume 46g and adult males consume 52-56g of protein daily.
Fatty fish, lean meats, eggs, lentils, legumes, nuts, and low-fat dairy are all good sources of protein.
