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Q: My hair seems to be getting thinner, and I see more on my hairbrush now. Should I be eating more protein?

A: For most people with hair loss, inadequate protein is not to blame.

It’s true that severe protein malnutrition may cause hair loss. But people with adequate access to food, a normal appetite and normal digestion should not lose hair due to low protein intake.

In fact, it’s more important that you get “enough” protein, not that you eat “a lot” of protein. A healthy, average adult diet includes about 50 grams of protein daily, representing about 10% of the total calories. You can easily get that much from a turkey sandwich, a glass of milk and a cup of yogurt.

The most common causes of hair loss are unrelated to protein intake. These include:

• Male pattern baldness: A combination of genetics and hormonal influences cause hair follicles to shrink, producing less and less hair over time
• Injury to the hair, including heat and chemical exposures at the salon
• Medications: A long list of drugs can cause hair loss
• Stress over a major illness
• Thyroid disease
• Childbirth: During pregnancy, hair grows thicker, and after delivery, hair loss is common.

Rare causes of hair loss include liver failure, kidney failure and skin diseases (such as alopecia areata or lupus).

For people with protein malnutrition, there are much bigger health concerns than hair loss, such as poor immune function, poor wound healing, lack of energy and muscle weakness.

Common causes of protein malnutrition include inadequate access to food, abnormal absorption of nutrients by the digestive tract (as may occur with colitis, infections or other intestinal diseases), HIV, cystic fibrosis, unusual diets and anorexia nervosa.

Other risk factors for protein malnutrition include:

• Poor appetite
• Swallowing problems
• Taking multiple medications
• Depression
• High nutrient requirements (as with children)
• Repeated “flares” of illness requiring hospital stays
• Alcoholism

It is rare to develop protein malnutrition in the absence of risk factors as long as you have access to a balanced diet. So, adding protein to your diet is unlikely to slow or prevent hair loss in the absence of protein malnutrition.

Talk to your doctor about any concerns you have about your protein intake and hair loss. Simple blood tests can provide useful information. Even if your protein levels are normal, your doctor may be able to identify another readily treatable, reversible cause of hair loss.

Robert H. Shmerling, M.D., is a senior faculty editor at Harvard Health Publishing and corresponding member of the Faculty of Medicine, Harvard Medical School. For additional consumer health information, visit health.harvard.edu.

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