Calvice na juventude
Autor: BUSQUEI SABER | Publicado: 2011-08-03T14:03:00-07:00





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A calvície costuma ser uma preocupação de homens acima dos 50 anos, mas o assunto tem preocupado muitos jovens que sofrem com a perda do cabelo antes mesmo dos 30. Para os mais novos, uma boa notícia: aqueles que começam a ficar calvos ainda jovens possuem 45% menos chances de serem vítimas do câncer de próstata.De acordo com um estudo americano, publicado nesta terça-feira na revista especializada Cancer Epidemiology, a calvície ainda na juventude está ligada a um alto nível de testosterona no organismo -&nbsp;o que ajudaria a diminuir as chances de tumores. Para a pesquisa, os cientistas analisaram 2.000 homens entre 40 e 47 anos, sendo que metade deles foram vítimas do câncer de próstata.Ao comparar em que idade os pacientes haviam começado a perder o cabelo, os pesquisadores descobriram que aqueles que apresentaram os primeiros sinais de calvície ainda&nbsp;ao redor dos&nbsp;30 anos foram os pacientes com os menores riscos de desenvolver o câncer. Apesar da boa notícia, especialistas alertam que o estudo ainda é controverso, já que pesquisas anteriores sugerem justamente&nbsp;o oposto:&nbsp;a calvície pode estar associada a maiores riscos de desenvolver o câncer.Na maioria dos casos, a perda de cabelo acontece quando o folículo capilar – uma bolsa tubular da epiderme que contém a raiz de cada fio capilar – se torna exposto a uma grande quantidade de dihidrotestosterona (DHT) – um andrógeno produzido pela testosterona. Se há muito DHT circulando no sangue, o folículo encolhe, deixando o cabelo mais fino e com um crescimento mais lento. Os cientistas acreditam que os homens com alto nível de testosterona tendem a perder o cabelo mais rápido, especialmente se há casos de calvície na família.Em um dos tratamentos mais comuns no combate ao câncer de próstata, o paciente faz uso de um medicamento que reduz os níveis de testosterona, já que o hormônio pode acelerar o crescimento de tumores já existentes. O que a nova pesquisa sugere é que um alto nível de testosterona na juventude pode, na verdade, ajudar a prevenir a doença.