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Public health is involved with protecting the health of whole populations. Epidemiology is the study and complete review of the cause, effect, and pattern of diseases. It is the key discipline of public health and notifies risk factors for disease and targets for preventive healthcare. The main portion of Epidemiology is to earn a new understanding of the correlation of genetic and environmental factors which affects human health, providing the scientific base for translation of this knowledge to the world. It is applied to extend the description of epidemic diseases and health-related conditions like high blood pressure and Obesity.