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Phenotype = Genetics + Environment + (Interaction of Genetics and Environment)

This simple equation is essentially what this study is verifying. Your phenotype (observable traits of a person) are the product of your genes, your environment and the interaction of the environment with your genes.

For example, your height is largely a function of your genetics. Malnutrition will have an impact, but your height is largely determined by your genes. Your language or accent is a product of your environment. Genes may impact your vocal qualities, but you speak a certain language with a certain accent because of the environment to which you were exposed (Think kid of Asian descent speaking with a heavy English accent) . This study describes the interaction of genetics with the environment. Certain genetic traits may be significantly impacted by the environment. This is nothing new, and it really underlies all dietary research whether the researchers know it or not.

BTW, Ornish is a bit of a whack job.