The Decisive Factors of Affecting Mortality reduction In human history, life expectancy has been higher and higher. For our ancient ancestors, the average of life approximately is 25 years at England in 1700. But in 19th century, life expectancy has improved by over 30 years. By the time, the dramatic changes have been occurred, which caused by three factors. The most significant aspects that affected morality reduction were nutrition, public health measures, and medicine. Human ingested enough nutrition to enhance immune system. Because of that, mortality was reduced. From the mid-18th century to the mid-19th century, economic growth was rapid and people’s diets had been improved. People ingested comprehensive nutrition from diets which could provide a variety of nutritional ingredients, such as vitamins, proteins and carbohydrates. Human’s thorough immune systems could use the nutritional ingredients to resist many kinds of bacterium and virus, and recover the functions after diseases by themselves. Therefore, improved nutrition was a determinant of mortality reduction. From the end of the 19th century into the 20th century, public health measures became more important in daily life. The high mortality rates in cities, urban centers started to deliver clean water and waste. People got extremely useful advice of personal health practices from their doctors. Completely public health measures could give an advantageous living environment for residents. Hence people’s prevalence rates would be lessened. Moreover, mortality rates were effectively reduced. “The water purification alone accounted for half the mortality reduction in the United States” (Angus Deaton 2006). Many diseases could be practically eradicated by developed public health measures which played very significant role in mortality reduction. From the 1930s
