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As mentioned earlier,
正如我們之前所言
most commonly used supplements have been used in traditional medicine practices.
很多常用的補充劑在傳統醫學中都有使用
In their original use, herbs were often given in symbolic and ritualistic manners
傳統上，草藥通常是一種象征帶有儀式的意味，
that provide psychological and cultural effects.
它們能夠產生心理和文化作用，
Most cultures had a healer who practiced these therapies and was viewed with respect.
大多數文化中都有這樣的醫師，他們給人們開藥并且受到極大的尊重，
It is not possible to expect a pill or a tablet containing an herb to replicate these complex interactions.
幻想一片補充劑中含有的草藥成分能夠代替這種復雜的活動是不可能的
One mechanism through which many supplements may impact health is by acting as antioxidants.
很多補充劑都是通過充當抗氧化劑來起到促進健康的作用的
Oxidation is a natural event in the human body in which
氧化是人類身體中的一個自然過程，
oxygen interacts with other molecules and causes them to be damaged.
氧氣和身體內的其他分子相互作用并使它們受損，
Common targets for oxidation include lipids and membranes,DNA molecules, and proteins.
通常，氧化過程的主要目標是脂質和細胞膜，DNA分子和蛋白質
The body has many defense systems in place to protect from oxidative damage.
人體內有很多防御系統保護人類受到氧化過程的侵害，
These antioxidants include enzymes and chelators
這些抗氧化劑包括酶和螯合劑，
that remove oxygen-containing molecules and repair the damage.
它們可以移除氧化的分子并且對受損的部分進行修復，
Many plants contain natural antioxidants as well which protect the plant cells.
很多植物也含有天然抗氧化物，它們可以保護植物的細胞
The most abundant antioxidants in plant foods are polyphenols.
植物中最常含有的抗氧化劑是多酚，
This is a widely varying class of chemicals
這是一種具有多種形態的化學物質，
that includes carotenoids, lutein, flavonoids, anthocyanins, and catechins.
包括類胡蘿卜素，葉黃素，類黃酮，花青素和兒茶素
In plants, some of these compounds provide bright colors of red, yellow, orange, and purple
在植物中，這些物質中的一些能夠呈現紅色，黃色，橘色和紫色
such as those found in tomatoes, squash, pumpkin, and beets.
比如番茄，南瓜和甜菜，
They are also found in tea and whole grains.
它們也存在于茶和天然谷物中
It is widely thought that the antioxidant activity of these compounds contributes to the health benefits
人們普遍認為，這些成分的抗氧化活動對人體健康有益，
associated with a diet rich in fruits and vegetables.
因此應該多食用水果和蔬菜
You may find advertisements for vegetable extracts or supplements
你或許會在廣告中發現一些蔬菜提取物或者補充劑，
that claim to be good sources in these compounds.
聲稱自己能夠提供這些抗氧化劑，
Caution needs to be exercised when considering these products
但是面對這些產品時我們必須要小心
because they are likely to be poorly absorbed from such formulations
因為它們可能并不能很好地被人體吸收，
and may have undergone significant chemical degradation in processing procedures.
并且在生產加工過程中很可能會由于化學過程而使得自身功效受到損害，
The best way to enrich your diet in these compounds
在飲食中添加這些物質的一個最好的方式
is to consume a wide variety of fruits and vegetables.
就是多吃水果和蔬菜
