If your initial question is too broad, given the length of the paper you plan to write, look for ways to restrict your focus. Here, for example, is how two students narrowed their initial questions.
Too broad
What are the hazards of fad diets?
What are the benefits of stricter auto emissions standards?
Narrower
What are the hazards of low-carbohydrate diets?
How will stricter auto emissions standards create new, more competitive auto industry jobs?
Exercise: Research questions