Really, food preference refers to consumer test in which the consumer is given a choice and asked to indicate their most liked product, usually from a pair. On the other hand, acceptance testing the consumer uses a rating scale (the most common hedonic scale is the 9 point hedonic scale) for the degree of liking or disliking.

Thanks, Juan Haro Vicente. Sorry, i forgot to mentioned that I'm looking for daily/habitual food intake context. Yes, what you mentioned is true for consumer based /sensory studies but it quiet confused in our daily intake since a lot of food items we tend to prefer and like. Tq.