Nutrition assessment is done to identify those at risk of diet-related problems, provide information for appropriate nutrition support, and monitor the progress of dietary therapy. Methods used include food records, weighed and estimated food collections, 24-hour recalls, and food frequency questionnaires, which are subject to errors from respondent inaccuracy, recall bias, and underreporting. Data interpretation considers nutrient targets, dietary guidelines, population standards, and additional factors like medical history, biochemistry, anthropometrics, living conditions, and daily schedules.