Why Does Nutritional Hair Loss Cause Brittle Hair?

Hair is made from a protein-rich fibre produced inside a follicle. When the body lacks energy, protein or a nutrient needed for cell division and keratin formation, the growing strand may be narrower, weaker or more uneven. The outer cuticle can lift and wear, allowing the hair to split, snap or feel rough. This can make shedding look heavier because broken pieces are shorter than the full strand.

Nutritional hair loss can follow restricted eating, poor absorption, illness or increased nutritional demand. Brittle hair can also result from bleaching, heat, tight styles, frequent washing or scalp conditions. A careful history helps separate breakage from shedding and identify whether a nutritional issue is actually present.

Use a gentle shampoo, conditioner and wide-toothed comb; reduce high heat, chemical processing and tight hairstyles while the cause is being assessed. Eat regular meals containing varied sources of protein and other nutrients. Do not start high-dose supplements based on hair texture alone: excess intake can be harmful and may obscure the real cause. A clinician can review diet, medicines, digestion and recent illness and decide whether blood tests or a dietitian referral would help.

Book an appointment if brittleness persists, breaks close to the scalp, or occurs with marked shedding, scalp inflammation, fatigue, weight change or bowel symptoms. Seek earlier review when hair changes follow a restrictive diet, surgery or prolonged illness. Sudden patchy loss, painful scalp or signs of infection warrant prompt assessment.

Ask whether your hair is breaking, shedding from the follicle or showing both patterns. Discuss relevant dietary gaps, medicines, digestive symptoms and which tests are appropriate. Ask how long a treatment plan should be followed and how to protect new growth from further damage.