One of the reasons that you are supposed to eat an array of colors is that it ensures your getting an adequate supply of phytochemicals. According to http://www.phytochemicals.info/: Phytochemicals are non-nutritive plant chemicals that have protective or disease preventive properties. There are more than thousand known phytochemicals. It is well-known that plant produce these chemicals to protect itself but recent research demonstrate that they can protect humans against diseases. Some of the well-known phytochemicals are lycopene in tomatoes, isoflavones in soy and flavanoids in fruits. They are not essential nutrients and are not required by the human body for sustaining life.
With the ever changing information regarding good nutrition, I don't know if any of that will turn out to be true or not, but just looking at the rainbow of peppers makes me hungry.
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