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For any "disease" or condition, you could start by considering interactions among environmental and social factors: Poor diet, resulting from food choices, "causes" nutritional deficiency or obesity in a population
Is it "caused" by historical distribution of land use, including (in developing countries) during colonial times?
Or by the regulatory environment, including crop subsidies, food inspections, etc.?
What about the role of NGOs, IGOs, aid networks?
What about infrastructure, such as food distribution networks, transportation, etc.?
Is the status of women/girls a factor?
What about mental health issues?
What is the role of commercial activity, including advertising?
What about the healthcare and health insurance system?
...Consider that how issues are framed is influenced by our assumptions and biases, and also, keep swimming upstream!
Is your topic researchable?
You may need to broaden or narrow the focus of your topic.
This may become more apparent as you search for and find information. It may prove difficult to find research on very narrow topics, or to cope with the vast literature on an un-focused, broad topic.
"The harmful effects of domestic beer consumption among female students at Cal's Big Game"
"Social factors contributing to binge drinking among college students in the United States"
"Alcohol consumption by young adults"
Below are some examples of questions or lines of inquiry.
Considering what question a research article addresses may help you determine if it's relevant to your needs:
Are their racial or ethnic disparities in type 1 diabetes mellitus prevalence?
Compare and contrast personal versus "upstream" factors relevant to these disparities.
Describe examples of things that could reduce these disparities, differentiating between personal and upstream factors.
If a policy or program increases disparities, what are possible reasons for this? Differentiate between personal and systemic factors.
Describe a plan/program/policy to reduce these disparities.
Justify why systemic or upstream factors contribute more to these disparities than personal factors.
What is the question being addressed in the study you are reading? Compare:
"Our intervention worked toward fixing Problem X"
"The best intervention(s) for fixing Problem X is/are:..."
Finding a systematic review that addresses the question you are interested in can be very helpful
Structuring Your Search
It may be useful to have a structure to help guide you when searching.
When you formulate a research question, consider these elements:
Phenomenon: What happened?
Subject or Population: Who did it?
Time: When did it happen?
Location: Where did it happen?
Cause or Motivation: Why did it happen?
Process: How did it happen?
Note: It is possible that not all of the above elements will be appropriate for your search topic. Here is a handout (PDF) to help with this process This exercise (PDF) will take you through the process of formulating a search