What is meant by a rainbow assortment of fruits and vegetables?

It has been established time and again by scientific studies on large number of people that a diet rich in fruits and vegetables is your best bet for preventing virtually every chronic disease. The evidence is so strong that it has been endorsed by U.S. government health agencies and by virtually every major medical organization, including the American Cancer Society. By "rainbow," we mean that by selecting fruits and vegetables in a variety of colors, including red, orange, yellow, green, blue, and purple, you'll be giving your body the full spectrum of pigments with powerful antioxidant effects, as well as the nutrients it needs for optimal function and protection against diseases.

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