As it turns out, food can only be labeled natural if it contains no artificial ingredients or added colors and is minimally processed, this is according to the USDA.

事实上，根据美国农业部的说法，食品只有在没加入人造成分或颜色，并很少加工的情况下，才能贴上“天然”的标签。

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Natural pigment can give the food delighted colors as well as physiological function. It can be applied to functional food manufacturing and medicine industry.

除了赋予食品艳丽的外观外，最近的研究表明有一些天然色素还具有多种生理功能，可用于保健食品工业和医药工业等。

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