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Tudo sobre a vitamina A: para que serve e principais fontes
Entender tudo sobre a vitamina A significa conhecer um dos nutrientes mais importantes para a saúde ocular.
Isso porque, sua deficiência é a principal causa de cegueira evitável em países em desenvolvimento; e mesmo nos casos leves, a falta dela compromete o sistema imunológico.
Portanto, uma alimentação saudável e equilibrada, rica em compostos naturais, é o caminho para alcançar o equilíbrio do corpo, mantendo-o em seu estado mais pleno.
Continue lendo esse artigo para entender mais sobre a vitamina A, onde encontrá-la e como reconhecer os sintomas de sua deficiência.
Tudo sobre a vitamina A e sua importância para o organismo
A importância da vitamina A para uma nutrição equilibrada e saudável é incontestável, pois ela possui funções fisiológicas variadas.
Além de atuar para o bom funcionamento da visão, contribui para o equilíbrio do organismo, reforçando o sistema imunológico – defesa do organismo contra doenças, principalmente as infecciosas.
Sua atuação no corpo também é associada ao crescimento infantil, ajudando na formação dos dentes.
Já em adultos, trabalha no processo de formação de colágeno, sendo um nutriente necessário para a renovação celular.
Sua ação antioxidante atua no combate aos radicais livres no organismo, essencial para evitar doenças relacionadas ao envelhecimento do corpo.
Ainda, ela é um importante componente para evitar acnes, inibir a carcinogênese (a formação do câncer), somando forças também contra à anemia.
Neste sentido, os benefícios da vitamina A possuem efeito duplo: ao mesmo tempo que reduzem a gravidade e a probabilidade do aparecimento de doenças, ela alivia a demanda dos atendimentos básicos de saúde.
Tudo sobre a vitamina A e o processo de funcionamento da visão
A vitamina A trabalha em conjunto com a opsina na região exterior dos bastonetes da retina. Juntos, esses dois componentes participam da produção de rodopsina, pigmento visual que atua na visão em condições de baixa luminosidade.
Vitamina A e a diferenciação celular
Atua diretamente nas células produtoras de queratina em diferentes tecidos epiteliais do corpo, principalmente nos dos olhos.
Além disso, a vitamina A tem ação bastante parecida com a de um hormônio na diferenciação celular de vários tecidos e órgãos.
Vitamina A no sistema imunológico
Participa dos processos de manutenção da imunocompetência, principalmente em relação aos linfócitos. Neste sentido, é fundamental para o bom funcionamento de respostas mediadas pelas células T e de ativação de macrófago.
5 benefícios da vitamina A
- Essencial ao crescimento e desenvolvimento do corpo humano;
- Atua na manutenção da visão;
- Reforça o funcionamento sistema imunológico
- Mantém saudáveis as mucosas do organismo que também atuam como barreiras de proteção contra infecções.
- Age como antioxidante.
Sintomas da carência da vitamina A
A deficiência da Vitamina A afeta as estruturas de diferentes órgãos, mais especificamente na estrutura que atua na proteção do tecido conjuntivo.
Portanto, sua carência pode causar diferentes sintomas, como:
- Cegueira noturna: é uma forma de disfunção da retina que prejudica a adaptação visual em ambientes pouco iluminados; sintoma bastante comum em crianças e gestantes.
- Xerose corneal: perda do brilho ocular que deixa córnea seca e com aspecto granular.
- Ulceração da córnea: a ulceração progressiva pode levar à necrose e destruição do globo ocular, provocando a cegueira irreversível.
- Infecções frequentes: apesar de os olhos serem os órgãos mais afetados, sua falta reduz a capacidade do organismo de se defender contra infecções em diferentes lugares.
Tudo sobre a vitamina A: onde encontrar
Assim como outros ativos naturais, a vitamina A é um micronutriente essencial. Ou seja, não é produzido pelo corpo e deve ser ingerido de forma complementar.
Encontrado em fontes de origem animal e vegetal, é recomendado fazer a reposição da vitamínica com acompanhamento médico.
No Brasil, o Ministério da Saúde entende a importância da suplementação e incentiva o consumo de alimentos ricos em vitamina A pela população.
A maior fonte deste nutriente é o fígado de alguns peixes, como o linguado, o bacalhau e o arenque. De modo geral, os animais do final da cadeia alimentar são os que contém maiores concentrações de vitamina A.
Fontes de origem animal
- Leite (humano e de outros animais);
- Fígado de peixe;
- Gema de ovo.
Fontes de origem vegetal
A provitamina A é encontrada em folhas verdes, vegetais amarelos e frutas de cor amarelo-alaranjada.
Os principais alimentos ricos na vitamina A são:
- Espinafre;
- Couve;
- Abóbora;
- Cenoura;
- Manga;
- Caju;
- Goiaba;
- Mamão;
Ao ingerir a vitamina A, nosso corpo a armazena no fígado, garantindo uma reserva do nutriente por mais tempo.
A alimentação desequilibrada faz com que o organismo recorra a essa reserva e, caso ela não seja reposta, ocorre a deficiência do nutriente.
Tudo sobre Vitamina A e a suplementação natural
Ao saber tudo sobre a vitamina A, você descobre que a suplementação alimentar natural é outra maneira bastante eficiente para consumir esse nutriente extremamente importante para o corpo.
Suplementos como o OPS Super Eyes são ricos em compostos naturais que buscam na natureza os nutrientes necessários para manter o funcionamento e equilíbrio do corpo.
Veja tudo o que o OPS Super Eyes pode fazer por você.
- Auxilia no combate da ação de radicais livres nos olhos.
- Atua contra a oxidação das membranas dos olhos.
- Favorece a regeneração do nervo óptico.
- Ajuda a aliviar a fadiga ocular.
- Contribui a favor da visão sob baixa luminosidade.
- Auxilia na proteção contra a perda de sensibilidade visual.
- Favorece os fotorreceptores, que filtram a luz nociva aos olhos.
Conheça toda a linha de suplementos da OP Suplementos em nossa Loja Virtual.
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