To our knowledge, this is the first study to compare individual estimates of amounts of served food with the actual weight of the food served in a laboratory setting, where less disruptive data collection techniques are applied. Other studies assessing the accuracy of estimated portion sizes have used photographs as the reference for the assessment (Huybregts et al, 2007, Turconi et al, 2005), fake food items (Bucher et al, 2011, Bucher et al, 2012, Bucher et al, 2013) or average portion size weights based on repeated measures (Ngigi, Verbeke, & Pérez-Cueto, 2011). In contrast, the present study was performed using actual food items. In addition, the use of the Intelligent Buffet allowed the exact weight of food served by each participant to be recorded in a relatively undisturbed manner.  请问一个英文句子概括本段