How can I develop a thesis statement relating to obesity prevention?

A thesis statement is simply a summary of your thesis or the main argument of your paper. Before you can construct a thesis "statement," you need to develop a thesis. To do so, you need to do research about the causes of obesity and different strategies which have been used to reduce obesity. Since this is a subject for which a Google search returns over a million results, your first step is narrowing your topic...

A thesis statement is simply a summary of your thesis or the main argument of your paper. Before you can construct a thesis "statement," you need to develop a thesis. To do so, you need to do research about the causes of obesity and different strategies which have been used to reduce obesity. Since this is a subject for which a Google search returns over a million results, your first step is narrowing your topic in order to make it possible to research and write about in a short period of time. 

One topic you might choose is prevention of obesity in children in the United States. To narrow this farther, you might look at recent pilot programs studying home visitation as a technique to prevent obesity among Native American pre-school children. You might claim that community-based programs that work closely with parents are an effective way to reduce obesity in a particular vulnerable population. Alternatively, you might look at other groups such as high school students in your community or low-income middle-aged Caucasian males in the southern United States. 

The key to writing a paper on this sort of topic is to narrow it to focus on some one specific aspect of the problem rather than just creating vague generalizations.