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Since nutrition scientists are constantly making new discoveries, we need to revise our recommendations for healthy eating from time to time. However, nutrition is an art as well as a science . It's an art because it requires creativity to develop a healthy eating plan for people who differ in their food preferences, beliefs and culture, let alone in their nutritional needs according to their genes and life stage. As we discover more about how our genes and our environment interact , it's becoming increasingly difficult to provide a single set of dietary recommendations that will be suitable for everyone.