What should you know about diet causing hair loss?

Hair production requires energy, protein, and micronutrients. A very limited intake, repeated dieting, loss of appetite, or rapid weight change can disturb the hair cycle. Shedding may appear after the trigger, which can make the cause difficult to recognise from the day it starts.

Diet is not the only explanation. Pattern hair loss can gradually thin the crown or hairline; alopecia areata can create smooth patches; scalp ringworm can cause scale and broken hairs; and tight hairstyles can cause traction alopecia. Telogen effluvium may follow illness or another bodily stressor.

Return to regular, varied meals if it is safe for you, and include adequate protein and a range of nutrient-rich foods. Avoid making several restrictive changes at once, because that makes the timeline harder to interpret. Tell your clinician about vegetarian or vegan eating, food intolerance, digestive symptoms, heavy periods, and any recent weight change.

Do not treat shedding with high-dose vitamins without advice. A clinician can review the scalp, diet, medicines, and health history, then decide whether testing is needed. Keep photographs in consistent lighting and note whether hairs are shedding from the root, breaking, or forming defined patches.

Arrange care when hair loss is persistent, rapidly worsening, patchy, painful, itchy, or associated with scale, redness, or swollen areas. Get prompt help for severe weakness, fainting, or symptoms suggesting significant illness alongside restricted intake. A new scalp change should not be attributed to diet without examination.

Could my diet be affecting the hair cycle, and what evidence would support that? Which other causes fit the pattern on my scalp? Should I change my meals, use a supplement, or consider a treatment only after testing?