Citrus are a diverse group of refreshing desirable fruits, with attractive colors. They include oranges, lemons, limes, grapefruits and tangerines. This family is becoming pretty famous, due to their richness in compounds called flavonoids, which have anticancer properties. These flavonoids are also antioxidants that can neutralize free radicals and may protect also against heart disease among others. "Every white will have its black, and every sweet its sour." Thomas Percy.