喝绿茶的利与弊

癌症抗癌

喝绿茶可以防癌。绿茶中含有的儿茶素、茶多酚等物质具有抑制癌细胞的作用。而且其他茶虽然也含有防癌抗癌因子，但效果远不如绿茶。现在医学实验证明绿茶对胃癌和肠癌有明显的防御和抵抗作用。

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防止早衰

经常喝绿茶有助于延缓衰老。我们知道，过度氧化会导致人体在新陈代谢时产生大量的自由基，加速人体的衰老。绿茶中所含的儿茶素能消除自由基，保护细胞膜，有助于延缓衰老。

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降血脂

经常喝绿茶可以有效帮助降血脂，因为绿茶中含有的儿茶素可以促进血液中胆固醇的分解，缓解血液的高凝状态。高血脂的人，经常喝绿茶可以有效降低血清中总胆固醇和甘油三酯的含量，血液粘度也会更低。经常喝绿茶不仅有助于降血脂，还能有效预防心血管疾病。

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健身减肥

绿茶含有丰富的维生素C，据分析计算，每100g绿茶中含有维生素C约280mg..而且绿茶中没有像水果那样的高糖成分，喝绿茶也不用担心肥胖的风险。此外，绿茶还可以帮助减少体内脂肪细胞的堆积，在减脂中不断减肥。

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龋齿预防

我们知道，牙膏中会添加一种叫做“氟”的物质，有助于预防龋齿。其实萝卜茶中就含有这种物质。经常喝绿茶或用绿茶漱口，有助于消除牙齿之间的一些污垢，防止龋齿。经常这样做还可以防止蛀牙，祛除口臭。

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清热解毒

绿茶最早发现的功能是清热解毒。它味苦性寒，经常饮用能有效帮助降火解毒。绿茶中含有的叶绿素和单宁酸有助于消炎杀菌，清热解毒。对于经常上火，脸上长痘痘的人来说，喝绿茶绝对是缓解这些症状的最佳选择之一。

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防辐射

经常喝绿茶可以改善看不见的辐射危害，这是一种人体健康状况。因为绿茶中含有一种叫做脂多糖的物质，可以有效帮助提高人体的非特异性免疫功能，有效帮助身体抵抗辐射。经常接触会产生辐射的电子产品的人，不妨试试每天喝绿茶。

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消除疲劳

喝绿茶有助于消除疲劳，因为绿茶中含有的儿茶素和维生素C可以分泌激素，帮助对抗疲劳、压力和紧张，使人喝后感到轻松。而且绿茶中含有的少量咖啡因能刺激中枢神经系统，使人感到神清气爽，疲惫不堪。

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喝绿茶的坏处

引起胃病

喝绿茶，尤其是新茶时，茶叶中含有的未氧化的多酚、醇类等物质会极大地刺激人体肠胃，导致肠胃不适，出现胃病。另外，对于胃寒的人来说，喝绿茶会加重胃部不适。

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影响铁的吸收

绿茶中含有的鞣酸会阻碍人体对铁的吸收，容易造成体内缺铁性贫血。尤其是月经期的女性，不宜喝绿茶。还需要注意的是，鞣酸不仅影响铁的吸收，还可能影响乳腺的血液循环，不适合需要哺乳的孕妇喝绿茶。

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增加心脏负荷

如果经常喝太多绿茶，可能会增加身体虚弱的老年人心脏的负担，导致血压升高，尤其是加入绿茶冲泡更烈，更容易导致心脏负担过重，甚至心力衰竭。

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诱发便秘

喝太多绿茶也可能导致便秘。因为绿茶中含有的鞣酸也可能与食物中的蛋白质结合，形成不易消化的沉淀物，导致便秘。所以绿茶一天不宜喝太多。

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什么时候应该喝绿茶？

下午适合喝绿茶。正常情况下，人体在中午会有很强的肝火。这个时候喝绿茶可以疏肝降火，清热解毒。

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谁不应该喝绿茶？

不是所有人都适合喝绿茶，比如贫血、脾胃不好、结石、发烧、便秘、营养不良、孕妇等。喝茶不利于健康，也不适合喝绿茶。

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