Brenda Khan
Protein is an essential nutrient for the body to function and perform various tasks, such as building and repairing cells, which are critical for growth and development. A diet deficient in protein can have several negative impacts on the body and its functions. While protein deficiency is uncommon in Western countries, it can lead to various health issues, including muscle loss, a weak immune system, skin and hair changes, and increased hunger. The body's largest reservoir of protein is in the muscles, and a lack of dietary protein can lead to muscle wasting, especially in older adults. Additionally, protein plays a crucial role in maintaining a healthy weight, and insufficient protein intake can lead to weight gain due to increased food consumption and fat mass. Furthermore, protein is essential for the production of neurotransmitters, which regulate mood and brain function. A severe form of protein deficiency, known as kwashiorkor, is characterised by swelling or edema and is commonly seen in children in developing countries.
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What You'll Learn
Increased hunger and weight gain
A diet deficient in protein can have several adverse effects on the body. One of the most common signs of protein deficiency is increased hunger and weight gain.
Protein is an essential macronutrient that helps regulate appetite and calorie intake. When the body does not receive enough protein, it attempts to restore its protein status by increasing hunger and cravings, leading to overeating. This increased appetite can result in consuming more high-carb and high-fat foods, which are less satiating than protein-rich foods. As a result, individuals may end up consuming excess calories, leading to unintended weight gain and, over time, obesity.
Research has shown that protein-rich meals keep hunger at bay for longer compared to meals consisting mainly of carbohydrates. A study published in The American Journal of Clinical Nutrition found that women who increased their protein intake to 30% of their total calories ended up consuming 441 fewer calories per day and lost an average of 11 pounds in 12 weeks. Additionally, a 2008 study of 158 people found that ingesting whey protein increased fat burning while preserving muscle mass.
Protein deficiency can also lead to muscle wasting, especially in older adults. This is because the body takes protein from skeletal muscles to preserve more critical tissues and functions. As a result, individuals may experience muscle weakness, fatigue, and reduced strength, further contributing to decreased physical activity and potential weight gain.
It is important to note that the amount of protein required varies depending on age, physical activity level, and fitness goals. The current guidelines recommend adults aged 19 and older consume 10-35% of their daily calories from protein. For older adults, especially those aged 65 and above, higher protein intake is recommended to prevent muscle wasting and associated health issues.
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Weakened immune system
Protein is an essential macronutrient that provides structure and support to cells and protects the body from viruses and bacteria. It is made up of a combination of molecules called amino acids, which are the building blocks of protein. Your body needs 20 different amino acids to function correctly, and it must get 9 of these, called essential amino acids, from the protein you eat.
A diet deficient in protein can weaken your immune system, making you more susceptible to infections. This is because proteins are important for building antibodies, which are produced by your white blood cells to help fight infections. A 2013 study in male athletes who engaged in high-intensity exercise found that participants who consumed a high-protein diet experienced fewer upper respiratory tract infections than athletes consuming a low-protein diet. However, more research is needed to fully understand the link between protein deficiency and infections.
A lack of protein can also cause mood changes or trouble thinking due to fluctuating blood sugar and protein's effect on the brain's neurotransmitters, which regulate mood. Neurotransmitters are made of amino acids, so a lack of protein in your diet could mean your body can't make enough of them, changing how your brain works. For example, low levels of dopamine and serotonin may lead to feelings of depression or aggression.
Protein deficiency can also lead to hair loss, dry skin, increased hunger, and edema (swelling). Edema is caused by low levels of human serum albumin, the most abundant protein in the liquid part of the blood, which maintains oncotic pressure, a force that draws fluid into the blood circulation. When albumin levels are low, fluid accumulates in the tissues, causing swelling.
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Fatigue and mood changes
Protein is an essential macronutrient that provides structure and support to cells and protects the body from viruses and bacteria. It is found everywhere in the body, from our hair to our bones.
A lack of protein in the diet can significantly affect health and lead to low protein in the blood, also known as hypoproteinemia. This can cause a range of symptoms, including fatigue and mood changes.
Fatigue is a common symptom of protein deficiency, with people experiencing low protein levels in the body often reporting feelings of weakness and tiredness. This is because protein is one of the body's main sources of fuel and energy. When the body does not have enough protein, it can affect muscle function and overall strength, leading to a decrease in energy levels and an increased perception of fatigue.
Additionally, protein deficiency can lead to mood changes. Protein is made up of amino acids, which are the building blocks of important neurotransmitters in the brain, such as dopamine and serotonin. These neurotransmitters play a crucial role in regulating mood and emotions. When the body does not have enough protein, it may struggle to produce sufficient amounts of these neurotransmitters, leading to potential changes in mood, such as feelings of depression or aggression.
It is important to note that severe protein deficiency is uncommon in Western societies, and symptoms of fatigue and mood changes may be indicative of other underlying health issues. If you are concerned about your protein intake or experience persistent fatigue and mood changes, it is always best to consult with a healthcare professional or a registered dietitian.
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Muscle loss and weak bones
Protein is an essential macronutrient that provides structure and support to cells and protects the body from viruses and bacteria. It is made up of a combination of molecules called amino acids, nine of which are "essential amino acids" that the body cannot produce and must be sourced from food.
Protein is found everywhere in the body, from our hair to our bones. It is particularly important for muscle and bone health, and a deficiency can lead to muscle loss and weak bones. When the body does not get enough protein, it tends to take protein from the skeletal muscles to preserve more important tissues and body functions. This can lead to muscle wasting, or sarcopenia, which is the progressive loss of muscle mass and strength.
Protein is also crucial for bone growth and maintenance. Bones are made primarily of a type of protein called collagen, and a deficiency can decrease bone mass and lead to weak bones that break easily. This is especially important for young children, as protein from calcium-rich foods is required for them to reach their optimum genetic potential for bone mass.
Older adults are at a higher risk of protein deficiency and the associated health risks, including muscle loss and weak bones. Research suggests that adults aged 65 and older should consume at least 0.5 grams of protein per pound of body weight, which is more than the recommended daily allowance of 0.36 grams.
To increase your protein intake, try adding protein sources such as meat, seafood, eggs, legumes, nuts, and dairy to your diet.
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Skin and hair changes
A diet lacking in protein can cause skin changes, including dryness, flakiness, and a pale appearance. These symptoms occur due to the body's decreased ability to produce collagen and elastin, which are essential for the structure and fullness of the skin. The skin may also take longer to heal from cuts, scrapes, and wounds due to the role of protein in the healing process.
Protein-deficient individuals may also experience hair loss, thinning hair, and brittle hair that breaks easily. This is because hair is largely made of protein, and a lack of it can affect hair growth and structure. The hair may also lose its colour and become finer with smaller diameters. A severe protein deficiency can lead to a hair loss condition known as telogen effluvium, resulting in excessive hair shedding.
In a study of 98 patients with skin and hair complaints, a significant number (68.4%) were consuming less than half of the recommended daily allowance of protein. These individuals experienced various skin and hair issues, including acne, pigmentation, vitiligo, premature ageing, and hair fall.
It is important to note that severe protein deficiency is rare in developed countries with access to a variety of food sources. However, certain populations, such as older adults, may be at a higher risk of protein deficiency and the associated skin and hair changes.
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Frequently asked questions
Signs of protein deficiency include swelling or edema, stunted growth, weak immune system, brittle hair and nails, skin and hair changes, and bone and
Protein deficiency can lead to various health problems and affect almost all aspects of body function. It can cause weight gain, increased appetite, and mood changes. It can also increase the risk of infections and lead to bone fractures.
The recommended daily intake of protein is at least 0.36 grams per pound of body weight, or 0.8 grams per kg. For older adults, the recommended intake is higher, at least 0.5 grams per pound of body weight.
Foods that are high in protein include fatty fish, lean meats, eggs, lentils, legumes, nuts, low-fat dairy, and Greek yogurt.
Protein deficiency is uncommon in Western countries but is more common in older adults, individuals with certain diseases, and those with overall poor diets.
