There are various phases in a process of decision-making, and a process of food preparation normally presents a rich variety of such phases that would offer opportunities to train students in developing their decision-making capabilities. This research aims to demonstrate the effectiveness of learning food preparation in terms of the subject matter. A total of 456 university students and high school students were the subjects of this study. They were classified into two types; those majoring or specializing in food preparation and those not majoring or specializing in it. Their value consciousness and decision-making ability were analyzed on the basis of the questionnaire sent and collected both prior and susequent to respective classes of food preparation. The results of the study are as follows: The research confirmed that both the university students and the high school students majoring in food preparation showed higher learning effectiveness on their value consciousness and decision-making capabilities in food life than those not majoring in food preparation. In other words, those with learning experience in food preparation faired better than those with no such experience. From the above, it is clear that the learning effect promotes the cultivation of decision-making ability in food life.