Does living in cities have bad effects on people's health

Health issues always can catch the general public attention. There has been an argument that living in a big metropolis may bring about adverse consequences to people’s health. To some extent, this is the case. In this essay, I will be exploring the reasons for this and explain how living in cities does have some benefits to people’s health.
With urbanization and industrialization, various kinds of water and air pollution have become increasingly severe in modern societies, especially in developing countries like China. These are considered to be a major threat to people's fitness [for formal writing, you might use ".. a major threat to the fitness of the people."]. According a statics from the China Social Academic, in big cities people’s life expectancy has been shortened by five years due to heavy pollution. What is more, life in big cities is usually very stressful and harsh. It is said that over half of white-collar workers have ever experienced sleeplessness at night, which can lead to unexpected health problems. Also, the fast pace of life is not good for people’s health.
On the other hand, living in big cities does have some advantages. For example, people can get excellent medical service in case of illness. In developing areas, first-class medical facilities tend to be concentrated in downtown areas. Actually, a large percentage of diseases have become incurable just because of a lack of medical care. Furthermore, it is more likely for people to get access to health advertisement in cities. The population in rural areas sometimes has very little knowledge on health, which is clearly in contrast to their urban counterparts.
As I see it, in cities, there are millions of problems which may have greater influence on people’s health. However, people in these areas have more access to good medical treatment, which of course are beneficial for their health.