Once you have determined the social determinant of health you wish to explore, you'll have to narrow your focus to a sub-theme or specific issue of interest. What specifically are you trying to learn more about? Essentially, what question are you trying to have answered?
Choose your topic of interest and start by conducting a broad search on it. Determine what kind of trending and popular research has already been done on your topic.
Narrow your topic down in a way that is relevant to you. You can refine your topic by one or more of the following:
Having more specific research terms will help in defining your question.
A broad question might be something like: What role do food banks play in reducing food insecurity?
A more narrow question with a critical focus could include:
Are food banks part of the problem, or the solution, to reducing food insecurity?
An even narrower question may include a geographic area:
In Canada, are food banks part of the problem, or the solution, to reducing food insecurity?
Once you have determined an appropriate research question/topic, then you can move on to planning your approach.
Additional Resources:
The objective of social research should be to discover something new about the social world. To achieve this you need a research question and you need to develop one (or a set of questions) which is researchable, in practice.