咖啡因和茶鹼可以导致钙流失

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咖啡因:

关于咖啡因和骨质流失关连性方面的研究发现 : 咖啡因会使钙在肠道及尿液中流失的量增加,在正常的情况下,人体会代偿性的增加肠道对钙的吸收量,但这种代偿作用会随着年龄的增加而降低,尤其当钙的摄取量又低于一般建议剂量(每天800毫克)时,此种代偿作用会更不明显。据统计,大部份中年以上的人,在摄入高含量咖啡因的同时只摄入低剂量的钙,这种情况目前已被证实会增加骨质的流失,对骨头造成伤害,因而增加发生骨折的机会。 咖啡因会改变个人的遗传体质,使你成为骨质疏松易患体质,导致骨质损失.可乐中含有大量的磷酸盐,会干扰骨质的形成,人体中血磷增高时,为了维持钙和磷离子总量的恒定,血钙必须减低,同时钙的吸收也会变差

 

专家对美国3170名50岁以上的老人进行饮茶习惯与骨折危险的分析表明,每天饮浓茶5杯的人髋骨骨盆处)骨折的危险较不饮浓茶者高70%;每天饮浓茶超过7杯者,其相对危险性达80%以上。这是因为茶中的 咖啡因可明显遏制钙在消化道中的吸收和增加尿中钙的排出。由于遏制吸收和加速排泄这双重途径,使体内缺钙而诱发骨中钙质流失,日久便出现骨质疏松症,容易导致骨折。