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横坐标从左到右为普通蓝莓、野生蓝莓,纵坐标为抗氧化能力

来源: 未知  2016-05-05 唐山视野
蔬菜和水果皮中所含的植物化学物质使他们具有抗氧化的保护能力,用以对抗强烈的阳光直射和其他严酷的生长条件。自然环境越恶劣,植物的保护力越强。当我们食用这些食物时,也会得到相同的抗氧化能力用以保护我们自身的健康。
野生蓝莓在恶劣的生长条件下茁壮成长,超过一万年。作为北美原产的特有浆果之一,野生蓝莓从来没有被栽培或人工种植过。然而,由于其高浓度的类黄酮花色苷——存在于蓝色水果中的植物化学素,使它们在难以想象的冰川土壤和寒冷北方气候下繁衍生息,成为在美国缅因州和加拿大独有的野生浆果。因为野生蓝莓与普通蓝莓相比具有较高的花青素含量,所以,当食用野生蓝莓时,我们将会从这种更耐寒的超级水果中获得额外的抗氧化保护。

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抗氧化剂是当今的热门话题,因为它们帮助我们的身体减少了与年龄相关的健康风险。但抗氧化剂是如何工作的呢?
每天,我们的细胞都在发动对抗自由基的战争。自由基是一种不稳定的氧分子,是人类身体正常新陈代谢的副产品。当你从日常饮食中不能够获得足够的抗氧化剂时,自由基会在身体里堆积,引发氧化应激,氧化应激是引发癌症、心脏疾病、糖尿病和其他老龄化疾病的一个重要因素。

膳食抗氧化剂,比如存在于野生蓝莓“蓝色色素”中的花青素——一种黄酮类化合物,具有消除自由基以及防止细胞损伤的能力。同时,抗氧化剂也具有消炎功能,而炎症被视为引起脑老化、老年痴呆症和其他退化性疾病的主要致病因素。

野生蓝莓是总抗氧化能力的冠军。通过一个被称为氧自由基吸收能力的测试实验后得出结论:野生蓝莓的总抗氧化能力是普通栽培蓝莓的两倍之多。

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