Fruits and vegetables get their color from the micronutrients they contain. Vitamins and phytonutrients responsible for providing these colorful hues vary in every plant source. There is no one particular color of food that provides all the available nutritional values we need. This is why it is so critical for you to eat all the colors of the rainbow. So, a ‘rainbow diet,’ is one that is abundant in all the nutritional colors essential for optimal health.