Nunţa părului unei persoane este dat de pigmenţi cunoscuţi sub numele de melanină. Părul cărunt este rezultatul unei cantităţi mai mici de melanină în keratină. Cu cât mai puţină melanină există în keratină, cu atât părul este mai cărunt. Părul alb nu are deloc melanină, notează adevarul.ro.
Stresul este una dintre cauzele care duc la încărunţirea rapidă a părului. Viteza cu care un om încărunţeşte variază de la caz la caz, în funcţie de numeroşi factori, printre care predispoziţiile genetice, expunerea la substanţe chimice şi nivelul de stres cronic înregistrat de-a lungul vieţii.
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