Background: In this modern era, the available food is increasingly diverse and processed into various types, so that some foods become unhealthy. This food is often called "Fast Food" or fast food that is high in calories and high in fat, sugar and salt (Kemenkes, 2018). According to the results of research conducted by Alfonita on students at the Faculty of Medicine, University of Sam Ratulangi during September - December 2014, showed that those who consume fast food once a day were 60.6%, 1-3 times a day as many as 5.6%, 4-6 twice a day as much as 2.8%, once a day 1.4%, and once or several times a year as much as 29.6%. Research Objectives: To find out how the description of knowledge, attitudes, and behavior of fast food consumption at the level 1 student of the medical faculty at one of the universities in western Indonesia. Research Methods: This research uses descriptive quantitative research with research subjects at the level 1 students of the medical faculty at one of the universities in western Indonesia with a research instrument that is a questionnaire that has been tested for validity and reliability. This research uses accidental sampling method with 92 respondents. Results: Based on the analysis, the level of knowledge of students about fast food consumption was mostly (77.2%) was good. The attitude of students about consumption of fast food is mostly in the negative category of 50 people (54.3%). For student behavior regarding fast food consumption, most of the students consume fast food with a frequency of 3-4 times, on average students consumed fast food accompanied by soft drink, students often consume fast food during the daytime and when they are in campus, and on average the pocket money of students spent on fast food is around Rp. 31,000.00-Rp. 50,000.00 for every fast food purchase. Recomendation: Researchers suggest for institutions to be able to issue policies related to fast food that exist around campus, for future researchers to be able to use more effective ways of getting data such as direct interviews.