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Theodoius Dobzhansky said, "Nothing in biology makes sense except in light of evolution." The evolutionary origin of diseases, such as heart attacks, tuberculosis, myopia and cancer, has been one of the most mysterious, complex and controversial aspects in medicine. Darwin's evolutionary perspective on medicine, however, can help us understand the origin of diseases which can be a valuable input in the ultimate goal of medicine. Evolutionary explanation provides a better understanding of our bodies' malfunctioning, natural selection's inability to eliminate the genes that cause hereditary diseases and the causes of other infectious diseases. Natural selection for the most part is responsible for determining the existence of mild to lethal modern-day diseases. Since natural selection improves our chances of survival and reproductive success, modern-day diseases are perhaps associated with increased fitness.
Our immune system has been shaped over centuries to provide resistance to......

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