quarta-feira, 23 de dezembro de 2009

VITAMINA B 12-Descobrindo cedo a falta dela dá para resolver

Pesquisadores ligam as deficiências das vitaminas B12 e de folato à doença de Alzheimer

Fonte: Neurology, 08/05/2001

Pessoas com níveis reduzidos de vitamina B12 e folato estão sob maior risco de desenvolver a doença de Alzheimer, de acordo com um estudo publicado na edição de 8 maio da revista Neurology.

O amplo estudo, que envolveu pessoas com idade acima de 74 anos, indicou que mais da metade dos pacientes (46 em 78) diagnosticados com demência apresentavam níveis reduzidos de vitamina B12 ou folato, além de um tipo de demência relacionada à doença de Alzheimer.

Os autores do estudo teorizam que a deficiência em vitamina B12 ou folato afeta a doença de Alzheimer, influenciando os neurotransmissores ou os níveis do aminoácido homocisteína no corpo. Qualquer dessas deficiências podem aumentar os níveis de homocisteína, que tem um efeito neurotóxico que pode levar à morte celular ou a condições neurológicas como a doença de Alzheimer.

As vitaminas B12 e folato (forma solúvel da vitamina B) são encontradas em alimentos comuns. A vitamina B12 é naturalmente encontrada em carnes, peixe, leite, laticínios, ovos e frango. Folhas verdes como o espinafre, nabo, feijão e ervilha, cereais fortificados e produtos a base de grãos, além de frutas e vegetais, são fontes ricas em folato.

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