Noah Sinclair
Hair and nails are made of the same hard protein called keratin, which also forms the feathers and beaks of birds, and the claws of animals. They are both appendages of the skin and have much in common in relation to their origin, anatomical structures, and common involvement in many diseases. Factors such as genetics, age, hormones, and nutrition can affect the growth of hair and nails. Nutrition, in particular, can impact hair and nail growth, with nutrient deficiencies contributing to hair loss and nail breakage. However, opinions vary on whether nail growth and hair growth are directly linked.
| Characteristics | Values |
|---|---|
| Average hair growth rate | 1 cm per month or 6 inches per year |
| Average fingernail growth rate | 3 mm per month or 1/8 inch per month |
| Average toenail growth rate | 1/16 inch per month |
| Fingernails growth rate compared to toenails | 4 times faster |
| Hair growth rate compared to nails | Faster |
| Nails composition | Keratin |
| Hair composition | Keratin |
| Factors influencing hair and nail growth | Sex, age, diet, exercise, time of the year, genetics, environment, health, etc. |
| Vitamins and minerals beneficial for hair and nail growth | Biotin, B6, B12, A, C, B2, B7, E, omega-3 fatty acids, zinc, etc. |
| Foods that help hair and nail growth | Eggs, oats, kidney beans, sunflower seeds, fish, etc. |
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What You'll Learn
Nutrition impacts hair and nail growth
The key to healthy hair and nail growth is a nutritious diet. Nails and hair are made mostly of a protein called keratin, which is also present in animal hooves. Keratin is created and supported by several nutrients. A diet high in protein, such as meat and leafy greens, provides the body with amino acids, which are essential for hair and nail growth.
Protein is especially important for hair, skin, and nail growth. Lean protein, in particular, is recommended. A decrease in protein intake has been linked to hair loss. Fatty fish like herring, salmon, and sardines are also good sources of protein and are rich in omega-3 and omega-6 fatty acids, which play an important role in skin function and appearance. Eggs are another good source of protein, with one large egg containing approximately 6 grams.
In addition to protein, healthy fats are important for hair and nail growth as they help lock in moisture. According to the Mayo Clinic, 20% of daily calories should come from protein, 20%-30% from healthy fats, and 45%-60% from carbohydrates. Carbohydrates provide energy for vital organs and tissues, and a drastic reduction in carbohydrates may result in insufficient energy for hair growth.
Vitamins are also important for hair and nail growth. Vitamin C, B2, B7, and vitamin E aid in healthy tissue growth and contribute to stronger and healthier hair. These vitamins can be found in foods and are preferable to supplements, as consuming too much or too little of a vitamin or supplement can lead to health problems.
A well-balanced diet that includes a variety of fresh, vitamin-rich foods will help support hair and nail growth. The Mediterranean diet, which is rich in raw vegetables and fresh herbs, and a diet that includes isoflavone-rich soy, may promote healthy hair growth. It is important to limit processed foods, sugary drinks, and excess alcohol, as these can negatively impact the health and appearance of hair and nails.
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Hair and nails are made of keratin
Hair and nails are primarily made of the same protein: keratin. Keratin is a strong protein, also found in animal hooves, skin, and even horns. The only difference between the keratin in hair and nails is that nails have a denser formation of keratin, which makes them harder than the hair shaft.
Keratin is created and supported by various nutrients. A diet high in protein, such as meat and leafy greens, provides the body with amino acids, which are essential for hair and nail growth. Mineral sulfur in the body also helps produce keratin, and vitamin A helps the body absorb protein correctly and aids in the physical composition of hair and nails.
Vitamins C, B2, B7, and E are all beneficial for healthy tissues and promote stronger and healthier hair growth. These vitamins can be found in various food sources, such as eggs, kidney beans, sunflower seeds, and oats, or in natural remedies such as coconut oil, olive oil, and almond oil. A balanced diet that includes sufficient nutrients is essential for maintaining the health of hair and nails.
In addition to nutrition, other factors that influence the growth of hair and nails include sex, age, exercise, time of year, and genetics. For example, men's hair and nails typically grow faster than women's, except during pregnancy when there is a hormonal boost. Nails also grow faster on the dominant hand, and fingernails grow faster than toenails.
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Fingernails grow faster than toenails
The first theory, known as "terminal trauma," suggests that the more a digit is used, the faster the nail grows. This is because the body assumes that fingernails are being worn down due to constant finger use, such as scratching, typing, or other activities. In contrast, toenails are generally protected and less exposed to similar wear and tear. This theory is supported by the observation that nails on the dominant hand, which is typically more used, tend to grow faster than those on the non-dominant hand.
The second theory posits that nail growth rate is directly proportional to the amount of blood flowing through the digit. Since the hands are closer to the heart than the feet, there is a higher blood flow to the fingers, resulting in longer fingernails. Additionally, nails grow slower in cold weather when blood flow is restricted, further supporting the influence of blood circulation on nail growth.
While the exact reasons for the difference in growth rates between fingernails and toenails are not fully understood, it is clear that fingernails outpace their lower-body counterparts.
Other factors also influence nail growth rates. For example, children's nails heal and grow faster than adults' before puberty, and men's nails and hair grow faster than women's, except during pregnancy when hormonal changes boost metabolism and blood circulation. Additionally, nails grow faster during the summer, and the growth rate slows with age due to decreased blood circulation.
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Seasonal, gender, age and hereditary factors affect growth rates
Seasonal, gender, age, and hereditary factors all influence nail and hair growth rates. While some of these factors are beyond our control, understanding them can help us optimize our nail and hair health.
Seasonal Factors
Nail growth can be faster during the summer months. This may be due to increased circulation in the nail bed during warmer periods. Similarly, hair growth may be influenced by seasonal changes. For example, hair tends to grow faster in summer and slower in winter.
Gender Factors
There is limited research on the direct link between gender and nail growth rates. However, it is known that nails on the dominant hand tend to grow faster, which may vary between men and women. Additionally, gender differences in hormone levels can indirectly affect nail and hair growth. For example, testosterone can impact hair growth rates and patterns.
Age Factors
Nail growth rates typically slow down as people age. As early as age 20, the growth rate slows by about 0.5% per year. Nails may also undergo changes in texture, thickness, shape, and color due to aging. Similarly, hair growth rates can decrease with age, and hair texture and thickness can change over time.
Hereditary Factors
Genetics play a significant role in determining nail and hair growth rates, as well as nail bed size and shape. Certain genetic conditions, such as psoriasis and rheumatoid arthritis, can also affect nail thickness. Additionally, nutrient deficiencies that run in families can impact nail and hair health and growth. For example, iron and zinc deficiencies have been linked to hair loss and brittle nails.
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Health and diet determine hair and nail growth
The growth of hair and nails is influenced by a combination of factors, including genetics, age, sex, diet, and overall health. While it is true that nail growth is an indicator of good health and nutrition, it is important to note that growth rates can vary depending on various factors.
Nails and hair are primarily made up of the protein keratin, which is also found in animal hooves and skin. The growth of both hair and nails occurs from a matrix, which, in hair, is known as the hair follicle. New cells form in the matrix and push older cells outward, causing them to harden and form the hair fibre or nail.
A balanced diet that includes sufficient nutrients is essential for maintaining the health and growth of hair and nails. Nutrient deficiencies, such as a lack of iron and zinc, can contribute to hair loss and brittle nails. Consuming a diet rich in vitamins and minerals, such as omega-3 fatty acids, zinc, and B vitamins, can promote healthier and faster hair and nail growth. Additionally, specific foods like eggs, kidney beans, sunflower seeds, and oats are rich in the vitamins and proteins necessary for nail and hair growth.
The growth rate of hair and nails is also influenced by factors such as the time of year, with faster growth occurring during the summer months. Additionally, men's hair and nails typically grow faster than women's, except during pregnancy when hormonal changes boost metabolism and blood circulation.
Overall, maintaining a healthy diet and lifestyle, including regular exercise and stress management, can contribute to the growth and strength of hair and nails. However, it is important to consult a healthcare professional if you notice significant changes in growth rates, as it could indicate underlying health issues.
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Frequently asked questions
Yes, and no. Nails and hair are made of the same material, keratin, and grow from a matrix of cells. However, the rate of growth is different for hair and nails, and varies from person to person.
On average, hair grows at a rate of 1 centimetre per month, while nails grow at just over 3 millimetres per month. Toenails grow at about half the rate of fingernails.
Genetics, age, hormones, nutrition, and gender all play a role in determining how fast your hair and nails grow. For instance, men's hair and nails typically grow faster than women's.
Yes, certain health issues can impact growth rates. Diseases, hormonal imbalances, natural aging, poor blood circulation, malnutrition, and medications can slow down hair and nail growth.
Yes, nutrition plays a significant role in the growth and strength of hair and nails. A balanced diet with sufficient nutrients is essential for maintaining their health. Nutrient deficiencies, especially of iron and zinc, can lead to hair loss and brittle nails.
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