Which of the following approaches to measuring diet is used by Willett and coworkers at Harvard University in such studies as the Nurses' Health Study and the Health Professionals Follow-up Study?

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The food frequency questionnaire is the approach used by Willett and coworkers at Harvard University in studies such as the Nurses' Health Study and the Health Professionals Follow-up Study. This questionnaire asks participants to report how often they consume certain foods and beverages over a specific time period, providing information about long-term dietary habits.

Which of the Following Approaches to Measuring Diet Is Used