Você sabia que o cálcio é o mineral mais abundante no corpo? Uma pessoa adulta pode acumular até 2% do seu peso. Embora a maior parte esteja nos ossos e dentes, também é encontrada nos tecidos, plasma sanguíneo, cérebro e células.
O que é cálcio e por que precisamos dele?
Este mineral não é apenas essencial para manter a saúde óssea, mas também desempenha muitas outras funções vitais que ajudam o corpo a funcionar adequadamente.
Tem um papel importante na contração muscular, na coagulação do sangue, nos batimentos cardíacos e na saúde do sistema nervoso. Sem ir mais longe, o cálcio desempenha um papel importante para tornar os nossos neurónios capazes de produzir impulsos nervosos ao longo da sua membrana.
Quais são seus benefícios para a saúde?
Saúde óssea
Os ossos estão constantemente formando ossos novos e quebrando ossos antigos, e precisam de cálcio para crescer e se desenvolver. Esta é uma das razões pelas quais a ingestão de alimentos ricos em cálcio é importante para as crianças (e também para os adultos), para evitar doenças como o raquitismo.
Após os 30 anos, o pico de massa óssea é atingido, o que significa que o corpo atingiu níveis ideais de tecido ósseo. A partir dessa idade, o corpo perde massa óssea lentamente.
Saúde muscular e cardiovascular
O coração é um músculo que precisa de cálcio para se expandir e contrair, assim como outros músculos do corpo.
Se você sofre de deficiência de cálcio, talvez não consiga se mover facilmente, pois seus músculos não funcionarão adequadamente. Você também pode sentir cãibras musculares e espasmos nos músculos faciais.
Saúde cerebral
À medida que envelhecemos, por vezes tendemos a esquecer as coisas e isto pode dever-se ao facto de as concentrações de cálcio nas células cerebrais não serem reguladas corretamente e fazerem com que os neurónios não funcionem como deveriam. Há evidências que sugerem que este processo pode tornar o cérebro incapaz de armazenar corretamente o conhecimento.
Diabetes
Um estudo mostrou que também existe uma relação entre a ingestão de cálcio e o diabetes, pois pode ajudar o corpo a metabolizar a glicose, essencial para que ela chegue às células e forneça energia. Isso funciona em conjunto com a quantidade certa de vitamina D. Também é possível que a quantidade certa de cálcio no corpo possa beneficiar pessoas com pré-diabetes, que ocorre antes do início da doença.
O que acontece quando há alterações na quantidade desse nutriente?
Tal como acontece com muitos outros nutrientes, os níveis de cálcio no corpo podem causar problemas de saúde por serem muito altos ou muito baixos. Abaixo você encontra as principais alterações e sintomas.
Quando há um déficit
O principal problema causado pela deficiência de cálcio, seja por uma condição genética ou pela baixa ingestão, é a osteoporose. Isto leva a ossos mais frágeis e, portanto, a um maior risco de fraturas.
Um fornecimento insuficiente também leva ao desenvolvimento de doença periodontal e pode levar a problemas neuromusculares, como fraqueza muscular, cãibras e convulsões. Por outro lado, a ingestão insuficiente de cálcio está associada ao aumento da pressão arterial.
Quando há excesso
O excesso de cálcio ou hipercalcemia pode produzir muitos sintomas diferentes. Por exemplo, sintomas como constipação, náusea, vômito, dor abdominal, fraqueza muscular, apatia, depressão, irritabilidade, confusão, dor óssea, aumento da frequência de micção, etc. Eles podem estar indicando que há muito cálcio no sangue.
Existem algumas alterações que também podem causar isso, como hiperparatireoidismo, hipertireoidismo ou insuficiência renal, entre outras.
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