Food is every substance in different stages of being processed, to which it is expected to be consumed by humans. Due to the increasingly present fast-paced lifestyle in the modern age. There is an increasing need for the preparation and production of so-called fast food. The focus of the fastfood concept is not on the nutritionally satisfactory composition and optimal energy value of the dish, but on the speed of preparation and marketing appeal. The goal of this paper is to show what attitude consumers have about fast food, and whether they are familiar with what they are consuming and whether they consider fast food good or bad for their health. Through this paper, it will be explained what role food has played throughout history and how it has changed. We will review how changes in lifestyle have led to different eating habits and how they have changed with respect to demographics. It will also be explained how the very process of food production, i.e. fast food, changed in accordance with technological advances and the emergence of genetic food modifications. Through this research made on 62 examinee using anonymous questioners, we showed how much fast food do adolescent residents of City of Zagreb consume and how often do they meet promotive materials for fast food products and what effect does it have on their perception of fast food. Research showed that examinee, even though they are aware that fast food is not good for their health, they still consume it often. With that, promotion materials like ads on social media, tv commercials and billboards do not have a significant role with their decision to consume fast food, rather the enjoyment they get out of the consumption of fast food. From the research we can conclude that examinee value the enjoyment and practicality of fast food more than its long-term effect on their health. This research can help with understanding habits of consumers, and it can help constructing a strategy for promotion campaigns to create healthier eating habits.