Both the amount and the quality of consumed food have a direct impact on health. There has been a noticeable increase in frequency of fast food consumption. The aim of the paper was to assess the food habits in a selected group of quick service restaurant employees, who have easy access to fast food. The survey was conducted at the end of 2014/beginning 2015 among 270 purposively selected McDonald’s Warsaw restaurant employees. An original survey questionnaire was employed. Statistica software was used to process the data; correlation coeffi cient was calculated taking p < 0.5 as the level of statistical signifi cance. The survey points to many nutritional errors committed by the employees, including too long intervals between meals and frequent fast food consumption. Additionally, it was observed that seniority played a role in food preferences: the longer the employee’s length of service, the more often would they consume McDonald’s-bought products. It was determined that place of employment was a determining factor in food choices. The respondents with longer seniority reported more frequent consumption of products bought during work hours and use of McDonald’s restaurants in general. Although almost half of the respondents were aware of the negative health eff ects of fast food, they did not limit its consumption. It appears essential to introduce health education for the surveyed group.