Environmental factors can alter the way our genes are expressed, making even identical twins different. Epigenetics is the study of changes in genetic expression that are not linked to changes in the DNA sequences but related to the influence of the environment on the genes being expressed or not --basically, whether a gene is silenced or activated. In essence, certain genes carry a sign that says, 'ignore me' --these genes are silenced. Other genes carry a sign that says 'pay attention to me' --these genes are activated. What makes the whole shebang noteworthy is that the patterns of these signs, is just as inheritable as the very genes themselves. Because of this, epigenetics offers an unparalleled indirect effect on the treatment of illness.
The GenoType Diet is a refinement of my work in personalized nutrition. It uses a variety of simple measurements, combined with blood type data, to classify individuals are one of six basic Epigenotypes: The Hunter, Gatherer, Teacher, Explorer, Warrior and Nomad types.