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.