Our health is not predetermined by our genes. No single gene controls the presence or absence of a chronic disease. Our pattern of health and illness is determined by how families of genes are expressed, and that expression can be influenced and indeed altered by a range of lifestyle, diet, and environmental factors—exercise, stress, pollutants, radiation, specific foods, phytonutrients, and more—that send signals to the cells of our body. 2. Chronic illness is a result of an imbalance in one or more of the core physiological processes. Such an imbalance derives from the interaction
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