The article reviews common dietary assessment methods and their feasibility in epidemiological studies. Dietary intake can be assessed through subjective reports (e.g., dietary recalls, records) or objective observations (e.g., duplicate diet approach, food consumption records). Each method has its strengths and limitations. Subjective methods, such as 24-hour dietary recalls and dietary records, are open-ended surveys that collect detailed information about food consumption but rely heavily on respondents' memory and interviewer skills. Objective methods, like duplicate diet and food consumption records, are more reliable but can be time-consuming and resource-intensive. Recent technological advancements, including computer-based and web-based systems, have improved the accuracy and feasibility of these methods, though they still face challenges in certain populations and require significant initial investment. Food frequency questionnaires (FFQs) are widely used for long-term dietary intake assessment due to their simplicity and cost-effectiveness, but their accuracy varies across studies. The article concludes that no single method perfectly assesses dietary exposure, and a combination of methods may be necessary for more accurate estimates. Researchers should carefully select methods based on their research objectives, hypotheses, design, and available resources.The article reviews common dietary assessment methods and their feasibility in epidemiological studies. Dietary intake can be assessed through subjective reports (e.g., dietary recalls, records) or objective observations (e.g., duplicate diet approach, food consumption records). Each method has its strengths and limitations. Subjective methods, such as 24-hour dietary recalls and dietary records, are open-ended surveys that collect detailed information about food consumption but rely heavily on respondents' memory and interviewer skills. Objective methods, like duplicate diet and food consumption records, are more reliable but can be time-consuming and resource-intensive. Recent technological advancements, including computer-based and web-based systems, have improved the accuracy and feasibility of these methods, though they still face challenges in certain populations and require significant initial investment. Food frequency questionnaires (FFQs) are widely used for long-term dietary intake assessment due to their simplicity and cost-effectiveness, but their accuracy varies across studies. The article concludes that no single method perfectly assesses dietary exposure, and a combination of methods may be necessary for more accurate estimates. Researchers should carefully select methods based on their research objectives, hypotheses, design, and available resources.