The eye tracking technique permits observation and measurement of the movement of eyes when consumers receive a visual stimulus or view a product. The information regarding their gazing behaviour is collected in an objective, rapid, and noninvasive way. An attached device or sensor will record the eyes’ movements, mark the observed region, and mark the time that the eyes stopped in each region, reflecting the observer’s attention and interest levels for each zone of the visual stimulus . A number of different measures such as time to first fixation, fixations before, fixation duration, and fixation count, can be used to characterise the gazing behaviour. By analysing those measures, the gazing behaviour of consumers and expected tastiness intensities or consumer perception of quality factors such as healthiness. Moreover, eye-tracking strongly contributed to the study of factors which might influence choice and consumer behaviour such as eating motivation decision goal, and thinking style. Furthermore, several studies used eye-tracking to understand how psychological illnesses and food-related health status, such as anorexia nervosa, eating disorder,or BMI status, influence consumers’ choice and food habits. Hence, eye tracking is proving to be a useful tool for studying consumer perception and behaviour by gaining information in an objective way.