A Food Frequency Questionnaire (FFQ) is a research tool used to assess an individual's dietary intake over a specific period, typically the past month or year. It consists of a list of foods and beverages, asking respondents how often they consume each item. This method helps researchers gather data on eating habits and nutritional intake. FFQs are commonly used in nutritional epidemiology studies to explore the relationship between diet and health outcomes. By analyzing the responses, researchers can identify patterns in food consumption and evaluate the impact of diet on conditions such as obesity, diabetes, and heart disease.