It's not officially a diet, but there are plenty of reasons to follow the rainbow, especially when picking out fruits and vegetables. The secret to ensuring that your body gets the necessary nutrients lies in following an eating regimen that's rich in color. There's a wealth of health benefits associated with these bright hues. Foods that are blue or purple (eggplant, blueberries, blackberries) lower the risk of cancers and improve memory and urinary tract health. Green fruits and vegetables (kiwi, spinach, greens) promote good vision and strong bones and teeth while also preventing some cancers. Red foods (tomatoes, cherries) improve heart health and memory and lower the risk of cancers. Yellow or orange fruits and vegetables, like carrots, pumpkin and sweet potatoes, boost the immune system, improve heart health and promote good vision.