
A diet lacking in protein can have several adverse effects on the body, including hair loss. Hair follicles are among the most metabolically active parts of the body, and hair growth may be impacted by protein malnutrition. Protein fuels the body and is one of three sources of calories. Amino acids, the building blocks of protein, are vital for the replication of protein-packed cells, and adequate protein intake is critical for providing the amino acids needed for normal hair growth. A diet rich in protein is crucial for a healthy head of hair.
| Characteristics | Values |
|---|---|
| Protein deficiency | Can cause hair loss, make all types of hair loss worse, and adversely affect any hair loss treatment |
| Protein-rich foods | Meat, beans, eggs, and nuts |
| Average daily protein requirement | 45 to 55 grams for the average adult |
| Daily protein requirement for athletes | 0.5-1 gram of protein for every pound of body weight |
| Daily protein requirement for vegetarians | High protein legumes, nuts and seeds |
| Daily protein requirement for vegans | Plant-based diet with a variety of high protein legumes, seeds, nuts and vegetables |
| Other factors that can lead to hair loss | Smoking, drinking, stress, lack of sleep, medical conditions, hormonal dysregulation, infection, and micronutrient deficiencies |
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What You'll Learn
- Hair follicles are metabolically active and require protein
- Poor diet or malnutrition can cause protein deficiency
- Protein deficiency can worsen hair loss and treatment
- Amino acids are the building blocks of protein and are vital for hair growth
- A balanced diet with adequate protein is key to hair health

Hair follicles are metabolically active and require protein
Hair follicles are among the most metabolically active parts of the body. They require a constant supply of nutrients to sustain rapid production and support hair growth. This includes an adequate intake of protein, which is one of the body's main building blocks and plays a critical role in the structure and function of hair.
Protein is made up of amino acids, which are essential for the replication of cells that form the hair shaft and contribute to hair length. A diet lacking in protein can disrupt this process, leading to hair loss or thinning over time. This is because, in the face of protein deficiency, the body will prioritise protein for more vital functions, causing more hair to enter the resting phase rather than the growing phase.
The recommended daily protein intake for adults is generally around 0.36 to 0.8 grams per pound of body weight, or roughly 45 to 60 grams per day. However, this can vary depending on age, physical activity level, and fitness goals. For example, athletes with strenuous training schedules may require up to twice the amount of protein as the average person.
A balanced diet that includes protein-rich foods such as meats, beans, eggs, and nuts can help ensure adequate protein intake. For vegetarians and vegans, dairy products like Greek yoghurt, legumes, nuts, and seeds can boost protein intake, while strict vegans can opt for plant-based sources of protein.
It is important to note that while protein deficiency can contribute to hair loss, it is not the sole cause. Other factors, such as medical conditions, hormonal changes, infection, stress, and sleep deprivation, can also influence hair loss. Additionally, sudden weight loss, malnutrition, and deficiencies in other nutrients like zinc, vitamin D, and iron can play a role in hair thinning and loss.
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Poor diet or malnutrition can cause protein deficiency
Protein is crucial for maintaining healthy hair. Hair is made up of protein fibres, and when the body does not get enough protein from the diet, it can lead to hair thinning and loss. The body prioritises preserving protein, causing more hair to enter the resting phase rather than the growing phase, resulting in hair loss over time. Additionally, a protein deficiency can affect the production of neurotransmitters in the brain, leading to potential changes in mood and behaviour.
A poor diet or malnutrition can lead to protein deficiency, especially during crash dieting or in developing countries after natural disasters. Malnutrition can result from a lack of overall calories and protein, causing extreme weight loss and muscle wasting. This can also impact hair growth and lead to hair thinning and loss. Severe malnutrition from a lack of protein is called kwashiorkor, which is prevalent among children in developing countries.
The recommended daily protein intake for an average adult is 45 to 55 grams, but this may vary depending on age, activity level, and overall health. To prevent protein deficiency, it is essential to maintain a balanced diet rich in protein sources such as meats, beans, eggs, and nuts. For those with dietary restrictions or allergies, alternative protein sources can be considered.
The effects of protein deficiency on hair loss can be addressed by adjusting the diet to include adequate protein intake. In most cases, improving the diet and increasing protein intake can promote hair regrowth. However, it is always advisable to consult with a healthcare professional or dietitian for guidance on treating protein deficiency and its associated symptoms.
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Protein deficiency can worsen hair loss and treatment
Protein is one of the body's main building blocks, playing a critical role in the structure and function of muscles, skin, enzymes, and hormones. It is formed of amino acids, which are essential for normal hair growth. A diet lacking in protein can therefore cause hair loss and adversely affect any hair loss treatment.
Hair has a growing phase and a resting phase. When the body does not receive enough protein, it will adjust by moving more hair into the resting phase, resulting in hair loss or thinning over time. This is especially true when someone goes on a crash diet, which changes the number of calories consumed, vitamins and minerals, and the amount of protein intake overall.
The average adult male and female should aim to consume 45 to 55 grams of protein per day. This can be achieved through a diet rich in meats, beans, eggs, and nuts. For vegetarians, this can include egg white omelets, cottage cheese, Greek yogurt, and high-protein legumes, nuts, and seeds. Vegans can also get their protein from a variety of legumes, seeds, nuts, and vegetables.
If you are experiencing hair loss due to protein deficiency, the best option is to adjust your diet so that you receive the right amount of protein each day. Typically, the lost hair will grow again by improving your diet and upping your protein intake to normal levels. It is very rare that hair restoration surgery or medications will be necessary to address hair loss caused by protein deficiency.
It is important to note that hair loss can be caused by various factors, including medical conditions, hormonal dysregulation, infection, micronutrient deficiencies, stress, lack of sleep, and smoking. If you are experiencing significant hair loss, it is recommended to visit a healthcare professional to determine the cause and receive the appropriate treatment.
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Amino acids are the building blocks of protein and are vital for hair growth
While hair loss can be caused by various factors, such as disease states, nutritional deficiencies, and sudden weight loss, protein intake plays a crucial role in maintaining hair health. A well-known effect of decreased protein intake is acute telogen effluvium (TE), which can lead to hair loss or thinning.
Protein is indeed essential for overall health, and this includes the health of your hair. Hair strands are made up of a protein called keratin, which is built from amino acids. Therefore, consuming a diet rich in protein and essential amino acids is crucial for maintaining healthy hair.
Amino acids are the building blocks of proteins, and there are 20-22 amino acids that make up proteins in humans. Out of these, 9 are considered "essential," meaning they must be obtained from the diet. Non-essential amino acids, on the other hand, can be produced by the body from the essential amino acids.
Keratin, the protein that makes up your hair, is composed of 18 amino acids. Some of the amino acids that occur most frequently in keratin include cysteine, arginine, lysine, and methionine. Cysteine is particularly important for hair growth as it forms strong disulfide bonds within the keratin structure. Lysine is also crucial as it contributes to collagen production, which supports the hair follicle and promotes hair growth.
Additionally, amino acids play a role in the production of neurotransmitters and hormones, which can impact hair growth. For example, tryptophan is a precursor to serotonin, which has been linked to potential effects on hair growth stimulation.
If you suspect that your hair loss is related to a lack of protein or amino acids in your diet, it is recommended to consult a healthcare professional or a nutritionist. They can help evaluate your diet and ensure you are meeting your daily protein and amino acid requirements.
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A balanced diet with adequate protein is key to hair health
Protein is one of the body's main building blocks, playing a critical role in the structure and function of muscles, skin, enzymes, and hormones. A diet lacking in protein can have adverse effects on hair growth and overall health.
Protein fuels the body, providing one of three sources of calories, along with carbohydrates and fats. A well-balanced diet that includes adequate protein is essential for maintaining strong, healthy hair. Hair is made up of protein fibres, so ensuring sufficient protein intake is crucial for hair health. The recommended daily protein intake for an average adult is about 0.8 grams per kilogram of body weight, or roughly 45 to 55 grams per day. However, this can vary depending on age, physical activity level, and fitness goals. For instance, serious athletes with strenuous training schedules may require up to twice the amount of protein as the average person.
A protein deficiency can cause hair loss and make existing hair loss worse. When the body does not receive enough protein, it adjusts by moving more hair into the resting phase, resulting in hair thinning and eventual hair loss. This is often seen in individuals on restrictive diets or those with overall poor dietary habits. Fad diets, low-protein vegetarian or vegan diets, and severe malnutrition can all contribute to inadequate protein intake and subsequent hair loss.
To maintain healthy hair and prevent protein deficiency, it is essential to consume a balanced diet rich in protein-containing foods. Meat, beans, eggs, and nuts are excellent sources of protein. For vegetarians, dairy products like egg white omelettes, cottage cheese, and Greek yogurt, along with legumes, nuts, and seeds, can boost protein intake. Vegans can ensure adequate protein intake by including a variety of plant-based sources, such as legumes, seeds, nuts, and vegetables, in their diet.
While supplements are an option, they may not always be effective and can sometimes cause more harm than good. It is always best to consult a healthcare professional or dietician to determine the appropriate dietary changes to ensure adequate protein intake and promote healthy hair growth.
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Frequently asked questions
Yes, a lack of protein in your diet can cause hair loss. Hair is made up of protein fibres, so it is crucial to have a diet rich in protein to ensure healthy hair.
Protein deficiency is when your intake is unable to meet your body's requirements. While true protein deficiency is uncommon in the Western world, some people get very low amounts from their diet.
The symptoms of protein deficiency include hair loss, edema, increased hunger, and more severe infections. In addition, a lack of protein can also make you lose muscle mass, cut your strength, and slow your metabolism.
Foods that are rich in protein include meats, beans, eggs, and nuts. For vegetarians, it is recommended to eat egg white omelettes, cottage cheese, and Greek yoghurt along with high-protein legumes, nuts, and seeds.











































