Milly Gaines
Dieting can cause hair loss due to several factors, including nutritional deficiencies, rapid weight loss, and stress. Nutritional deficiencies, such as a lack of protein, biotin, iron, zinc, and vitamins, are essential for hair growth and can lead to hair loss if insufficient. Rapid weight loss and restrictive diets can cause physical and emotional stress, triggering hair follicles to stop growing and enter the catagen phase prematurely, leading to hair loss. Additionally, very low-calorie diets or those restricting certain food groups may result in nutrient deficiencies, further contributing to hair loss. Maintaining a balanced and healthy diet is crucial for hair health and can help reverse hair loss.
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What You'll Learn
Nutritional deficiencies
Protein is essential for hair growth, as hair is made up of protein. A diet without enough protein can lead to hair loss and thin, brittle hair. Amino acids, the building blocks of protein, are also necessary for hair growth. A very low-calorie diet or those that restrict certain food groups may cause hair loss due to nutrient deficiencies.
Iron deficiency is a well-known cause of hair loss. Iron is needed to supply nutrients to hair follicles, and a lack of iron can disrupt this process and stop the hair growth cycle. Diets low in iron are more likely to induce hair loss. Iron deficiency anemia, caused by a low red blood cell count, can have several serious health complications.
Zinc is another essential mineral for hair health. It is a trace mineral that the body cannot produce, so it must be obtained through food. A diet lacking in zinc can lead to hair loss.
Vitamin D stimulates the growth of new hair follicles, so a deficiency can cause hair loss or thinning.
Other nutrients that may affect hair loss include vitamin B12, folate, riboflavin, copper, selenium, biotin, fatty acids, and essential calories.
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Crash dieting
Hair is mainly made up of protein fibres, and amino acids, the building blocks of protein, are essential for hair growth. They foster the production of keratin, the hair's primary structural protein. When the body does not get enough protein, it prioritises more critical functions like tissue repair, water balance regulation, digestion, pH, and hormone production. This leads to weakened hair and hair loss.
Additionally, crash diets often result in nutrient deficiencies, especially in iron, zinc, and vitamin B12. Iron supports hair growth, so an undersupply can trigger unexpected or additional hair loss. Zinc and vitamin B12 are also important for hair health. Deficiencies in these nutrients can be corrected by including foods like nuts, eggs, spinach, cashews, and legumes in your diet.
The stress that the body undergoes during crash dieting can also contribute to hair loss. Stress-induced hair loss is called telogen effluvium (TE), and it occurs when hair follicles prematurely enter the resting phase and shed when they are supposed to grow. TE generally lasts for about 6 months but can become chronic if the stressor is not removed.
To prevent and treat hair loss caused by crash dieting, it is important to focus on a balanced diet rich in essential nutrients and to maintain a healthy lifestyle. Consulting with a healthcare professional or dermatologist is also recommended to address any underlying issues and receive personalized advice.
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Rapid weight loss
Firstly, rapid weight loss can induce stress and cause hormonal imbalances. The body perceives rapid weight loss as a form of physical stress, leading to increased cortisol production. These hormonal changes can disrupt the normal hair growth cycle, causing hair loss. This is known as telogen effluvium, a common form of temporary hair loss where hair follicles enter the resting phase of the hair growth cycle prematurely, resulting in increased hair shedding. Telogen effluvium typically occurs around three months after a triggering event like rapid weight loss and lasts for about six months as the body adjusts to the changes.
Secondly, restrictive diets often associated with rapid weight loss can lead to nutrient deficiencies, which are linked to hair loss. Diets lacking essential nutrients such as protein, amino acids, iron, zinc, and fatty acids can disrupt the normal hair growth cycle. Hair follicle cells are among the body's most rapidly dividing cells, and nutrient deficiencies can negatively affect their growth. Proper nutrition is vital for the formation of healthy hair shafts and the promotion of hair growth.
To address hair loss caused by rapid weight loss, it is important to manage stress levels, ensure a balanced diet, and address any nutrient deficiencies. Consulting with healthcare professionals such as nutritionists and dermatologists can provide valuable guidance and support during weight loss and hair loss prevention.
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Restrictive diets
Iron deficiency, for example, is the most common nutritional deficiency worldwide and is a well-known cause of hair loss. It disrupts the nutrient supply to hair follicles, stopping the hair growth cycle. Similarly, zinc is an essential mineral that must be obtained through food as the body cannot produce it. A diet lacking in zinc can lead to hair loss.
Protein is also essential for hair growth as hair is made up of protein. A diet without enough protein can lead to hair growth abnormalities, such as hair loss and thin, brittle hair.
Additionally, restrictive diets can cause rapid weight loss, which can lead to physical and emotional stress. This stress can trigger hair follicles to stop growing and enter the catagen phase prematurely, leading to hair loss.
The link between restrictive dieting and hair loss has been documented in research as far back as the 1970s. It is important to note that hair loss due to dieting is usually temporary, and hair growth will typically resume once the body's nutrient needs are met, and it is no longer stressed by rapid weight loss.
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Telogen effluvium
To treat telogen effluvium, it is important to address the underlying cause. For example, dealing with stress, correcting nutritional deficiencies, and addressing any medical issues. A healthcare provider can help diagnose telogen effluvium and recommend steps to promote new hair growth, such as consuming extra protein and taking vitamins.
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Frequently asked questions
Dieting can cause hair loss due to nutritional deficiencies, particularly a lack of protein, iron, zinc, vitamin D, fatty acids, selenium, and biotin. Calorie restriction can also affect hair growth by reducing the energy supply to hair follicles.
Nutritional deficiencies can cause hair loss, but they may also present as other symptoms. For example, a lack of iron can lead to iron deficiency anaemia, which has several serious health complications. It's important to consult a healthcare professional if you suspect a nutritional deficiency.
To prevent hair loss, it is important to avoid restrictive diets and aim for a balanced, healthy diet that provides your body with the nutrients it needs. This includes ensuring adequate intake of protein, iron, zinc, and other essential nutrients.
If you're experiencing hair loss, consult a healthcare professional to rule out any underlying medical conditions or nutritional deficiencies. They may suggest treatments to stimulate hair growth or recommend dietary changes to promote hair health.
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