The American Obesity Epidemic

I am currently working on answering the question: "What is the cause and cure of the American obesity epidemic?" My original topic was not about the American epidemic, but it was about high fructose corn syrup. I changed my topic because there is only so much you can talk about regarding high fructose corn syrup and I fear that I will not reach the required amount of pages to complete the research paper. So now my paper will be talking about obesity and to answer the question stated above. American obesity has been a large problem since the rise of fast food restaurants and soda companies, but there are many other first-world nations that do not have this epidemic. I have a good guess that the higher consumption and less exercise in American society could be the root of American obesity, but I have not researched much to be entirely sure. I am hoping to find a lot of answers as to why America is the fattest nation in the world and the many possible ways to cure it. The only question I have is, what topics should I explore regarding obesity? One of the topics I have already is about high fructose corn syrup, but I am still deciding about the other topics I want to implement on the paper. Some ideas I have is the boom of fast food restaurants, higher consumption of meat in America, and the different ways to fight against obesity. Please comment some ideas below because it would really help me in my paper. Thank you!