Notícias
Mudar o estilo de vida pode reverter envelhecimento celular
Os pesquisadores sabem há bastante tempo que mudanças no estilo de vida — como a adoção de dietas e a prática de exercícios físicos — podem melhorar a saúde de um indivíduo, prevenindo problemas cardíacos e aumentando sua expectativa de vida. Uma pesquisa publicada na revista The Lancet Oncology nesta terça-feira mostra, pela primeira vez, que essas mesmas mudanças também podem impedir, e até reverter, o envelhecimento das próprias células do indivíduo — e do DNA em seu interior.
Os telômeros são estruturas de proteína localizados no final de cada cromossomo. Eles fornecem uma proteção semelhante à presente nas pontas dos cadarços. Eles costumam envolver as extremidades do DNA, ajudando a mantê-lo estável e impedindo seu desgaste. No entanto, conforme as células se dividem, os telômeros se tornam mais curtos e mais frágeis. Assim, com o passar do tempo, eles se tornam menos capazes de proteger os cromossomos e podem ser usados como uma espécie de indicador da idade das células.
Os pesquisadores já sabem que comprimentos menores dos telômeros estão associados a um risco maior de morte prematura e doenças relacionadas com a idade, incluindo muitas formas de câncer — como o de mama, próstata, pulmão e colorretal —, doenças cardiovasculares, demência, AVC, osteoporose e diabetes.
Em seu estudo, os pesquisadores da Universidade da Califórnia, nos Estados Unidos, analisaram se mudanças no estilo de vida poderiam ter influência direta no próprio tamanho dos telômeros e não só na saúde geral do corpo. Para isso, analisaram o DNA de um pequeno grupo de homens diagnosticados com câncer de próstata de baixo risco, e que não tinham sido submetidos a tratamentos convencionais como cirurgia ou radioterapia.
Dez desses homens foram selecionados para passar por um tratamento que incluía uma mudança completa em seu estilo de vida, incluindo a adoção de uma dieta vegetariana, um regime de exercícios físicos moderados, a prática de técnicas de gerenciamento de stress — como meditação e ioga — e uma maior proximidade com família e amigos. Outros 25 homens serviram como um grupo de controle, e não passaram por nenhum tipo de tratamento.A papercraft option running short Cheap Tiffany Sale on lower income
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