A Researcher Is Interested in Seeing Whether Early Exposure to Certain

Essay

A researcher is interested in seeing whether early exposure to certain FDA approved food preservatives has a negative impact on the cognitive development of children. Clearly a controlled laboratory experiment would be difficult, if not impossible, to do and raises some ethical issues as well. What kind of study could be done that might provide evidence for a possible causal relationship between ingestion of food preservatives and cognition. Describe briefly how this study might be done.