Various methods are used to collect dietary data in epidemiological studies, including:
24-hour Dietary Recalls: Participants recall all foods and beverages consumed in the past 24 hours. This method provides detailed intake information but may not represent usual intake. Food Frequency Questionnaires (FFQs): Participants report their usual intake of specific foods over a longer period (e.g., past month or year). FFQs are useful for capturing habitual intake but may lack detail. Dietary Records: Participants record their food and beverage intake in real-time over several days. This method can be highly accurate but is also burdensome for participants.
