Dietary intake and physical activity assessment
During the study period, subjects maintained their usual dietary intake. Changes in dietary intake were evaluated through a standardized 3-day dietary record (2 days on weekdays, 1 day on weekends). Dietary intake was analyzed by a trained dietitian. Total daily intakes of energy, carbohydrates, lipids, protein, and fiber were analyzed using a Computer-Aided Nutritional analysis program (CAN-pro, Korean Nutrition Society, Seoul).Subjects were asked to maintain their usual physical activity during the study period. Changes in physical activity were measured according to activity using a global physical activity questionnaire (GPAQ). GPAQ is a questionnaire that measures physical activity in three domains, including work (vigorous-to-moderate intensity activity for more than 10 min for daily work-related activities), transport (activities such as cycling and walking for more than 10 min for movement of place), and recreation (vigorous-to-moderate intensity activity for more than 10 min for leisure activities) [