前言是，我真的非常讨厌美国，不管是这个国家还是这里的人，但这并不影响我选择要在这里求学。我是个现实的人生存和感情可以分开来谈的。而这里的食物是我最讨厌的，那么就从肥胖来看美国的生活方式吧。（This might be a good introduction of begin a presentation），PS其实这是我翻译的别人的，我就当作业交了。既然要写这么无聊的essay，我确实觉得没什么意义，所以我的脑子拒绝工作，刚好看到这篇文章挺符合我意的，就篡改翻译了。 

American have became considerably more obese during the last 25 years. What had affected this was consuming more calories than how many they actually needed. What explains this growth in obesity? Why is obesity higher in the US than in any other developed country? Americans have to admit that automobiles and a great deal of high fat food are the two main factors lead to obesity.

  Firstly, automobile is an important part of Americans, it is no exaggeration to say that they can even count how much walk they did every day. It is hard to image how much Americans rely on automobiles, basically their daily life begin with entering the parking lot, find their cars and drive into another garage. The US gained the name of “a nation living on the wheels” because of the suburbanization happened in 1960s, large sum of houses were built in the suburb, and conducted the citizens to move out from the center of the city. It was indeed achieved the tow major objectives: the standard of living condition was improved, along with the automotive industry developed. At present time Americans are paying for their overweight, starting to live concentrated and walk instead of driving.

  Secondly, excessive eating high fat food and high protein food are harmful to health of American. 1914, there was an experimentation made by some American scientists, they used animal protein to feed the mice, and they found out these mice grew fast and big. At that time, most of Americans were Pilgrims immigrated from Europe, their eating habits were simple. Thanks to the promotion of this experimentation, it leaded to a big change in American’s eating habit: large steaks、hamburgers、 milk and dairy product have become the major food. Americans did gain benefits from those, they are physically strong. However, world widely a lot epidemiology data proved that high fat food is closely related to fat、hepatic adipose infiltration、 angiocadiopthy  and some other cancers. Saturated fat and high-cholesterol-contained food are two main factors. According to a mass of experimental data, the us national authority organization—— ADA suggested that having vegetables could lower the risk of getting those chronic diseases; and these chronic diseases include adiposity、CAD（coronary artery disease）、 hypertension、 diabetes mellitus、 carcinoma of colon、lung cancer and disease of the kidney. In fact, just having vegetable food may be the most salutary diet.

  We cannot ignore these facts any more, American food are approaching other countries, and the way Americans eat are not good for health. We learnt that for environmental problems, we cannot develop the country first pollute the environment and then take counter-measures. Same for the unhealthy lifestyle problem, people have to aware of what is happening among Americans, we cannot first suffer from the diseases and then turn around go back for the old lifestyle. Let that be a lesson to all of us, never repeat the mistakes were made by others and leave trouble for oneself or leave a legacy of trouble to the next generation.