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成人叶酸吃多了有副作用吗?备孕长期吃叶酸有什么副作用?

发布日期:2022-06-29 11:00:37编辑:美清

  服用叶酸会带来很多好处,孕期妈妈们大多会补充叶酸。但是叶酸的用法用量是有标准的,吃太多会有副作用的。那么成人叶酸吃多了有副作用吗?备孕长期吃叶酸有什么副作用?

  成人叶酸吃多了有副作用吗?

  1.可以掩盖维生素B12的缺乏

  高叶酸的摄入可能会掩盖维生素B12的缺乏。你的身体使用维生素B12来制造红细胞,保持你的心脏。大脑和神经系统的最佳操作。如果不及时治疗,这种营养素的缺乏会降低大脑正常工作的能力,导致永久性神经损伤。这种损伤通常是不可逆的,这使得维生素B12缺乏的延迟诊断尤为令人担忧。

  叶酸和维生素B12的使用与你的身体非常相似,这意味着它们的缺乏会导致相似的症状。一些证据表明,叶酸补充剂可能覆盖维生素B12引起的巨幼细胞性贫血,这可能导致未发现的潜在维生素B12缺乏症。因此,虚弱、疲劳、注意力不集中、呼吸短促等症状的人可以从B12水平的检查中受益。

  2.与年龄有关的智力下降会加速吗?

  过量摄入叶酸可能会加速与年龄相关的智力下降,尤其是对维生素B12水平较低的人。一项针对60岁以上健康人的研究发现,叶酸水平较高的人智力下降,而B12水平正常的人智力下降。血液中叶酸含量高的参与者通过摄入高水平叶酸(以强化食品和补充剂的形式)而不是食用富含天然叶酸的食物。

  另一项研究表明,叶酸含量高但B12含量低的人比血液参数正常的人大脑功能丧失的可能性高达3.5倍。这项研究的作者警告说,叶酸补充剂可能对低B12水平的老年人的心理健康有害。此外,其他研究还发现,过量服用叶酸补充剂会导致智力下降。记住,在得出强有力的结论之前,需要进行更多的研究。

  3.可能会减缓儿童的大脑发育

  怀孕期间摄入足够的叶酸对婴儿大脑发育和减少畸形的风险是必要的。育龄妇女经常被鼓励服用叶酸补充剂,因为许多妇女不能仅仅从食物中获得RDI。然而,过量摄入叶酸可能会增加儿童的胰岛素抵抗力,延缓大脑发育。

  在一项研究中,怀孕期间每天摄入1000微克叶酸的4-5岁儿童在大脑发育测试中的得分低于每天摄入400-999微克叶酸的儿童。另一项研究表明,怀孕期间血液中叶酸含量越高,9-13岁儿童患胰岛素抵抗的风险越大。尽管需要进一步的研究,但除非健康专家建议,否则最好避免在怀孕期间摄入过量的叶酸。

  4.癌症复发的可能性会增加吗?

  叶酸在癌症中的作用似乎是双重的。研究表明,将健康细胞暴露在足够水平的叶酸中可以保护它们免受癌症的伤害。然而,将癌细胞暴露在维生素中可以帮助它们生长或扩散。换句话说,研究是混合的。尽管一些研究指出,服用叶酸补充剂的人患癌症的风险略有增加,但大多数研究报告并不相关。

  风险可能取决于癌症的类型和你的个人历史。例如,研究表明,如果以前被诊断为前列腺癌或结肠直肠癌的人每天摄入超过1000微克叶酸,癌症复发的风险将增加1.7-6.4%。

  不过,还需要更多的研究。记住,吃富含叶酸的食物不会增加患癌症的风险,甚至可能有助于降低风险。

  推荐使用,剂量和可能的相互作用。

  叶酸含有大多数复合维生素。产前补充剂和复合维生素B,但也作为单独的补充剂出售。在一些国家,有些食物也富含这种维生素。叶酸补充剂通常用于预防或治疗血液中叶酸水平过低。此外,孕妇或孕妇经常服用它们,以降低出生缺陷的风险。

  叶酸RDI是大多数成年人每天400微克,怀孕期间每天600微克,哺乳期每天500微克。补充剂通常为400-800微克。叶酸补充剂不需要处方即可购买,一般认为正常剂量是安全的。换句话说,它们可以与一些处方药相互作用,包括治疗癫痫、类风湿性关节炎和寄生虫感染的处方药。因此,任何服用叶酸的人在服用叶酸前都应咨询健康专家。

  备孕长期吃叶酸有什么副作用?

  在怀孕期间,我相信很多女性会补充叶酸。但是你知道吗,叶酸不能补充,否则会有副作用。那么,怀孕期间叶酸补充剂的副作用是什么呢?让我们看看。

在怀孕期间,夫妻需要两个人一起补充叶酸。怀孕后,他们的妻子将继续服用叶酸片3个月。具体剂量需要遵循医生的建议。如果条件允许,你可以在整个怀孕期间吃。叶酸是人体所需的重要营养素。及时合理的补充可以有效预防胎儿神经管畸形。我们都知道我们应该吃叶酸。我们还应该在日常饮食中多吃富含叶酸的食物,但是如果我们补充过多的叶酸会发生什么呢?有害吗?

答案是肯定的。过量摄入叶酸容易导致某些肿瘤疾病的风险增加;其次,大剂量补充叶酸会掩盖血液中维生素B12缺乏的症状,从而影响医生对患者的判断和治疗;另一个原因是叶酸补充过多会干扰人体的新陈代谢。根据《中国妇幼饮食指南》中的建议,妇女应在怀孕的前三个月补充叶酸,每天400微克。但是你怎么知道吃了三个月后你会怀孕呢?如果你没有怀孕,你想继续吃叶酸吗?如果我们在食物中添加叶酸,很容易补充过量,而人们对叶酸的最高耐受性是每天1000微克。

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