This research, “ A study on how advertisements and online food delivery system influence the food and lifestyle of people”, is intended to elaborate the in depth on the effects of the different online food delivery websites and mobile applications. The research primarily aims at highlighting the level of influence exerted in the people living in different geographic locations and the effects of different advertising forms on them. This is again a metropolitan cities and their frequency of using online food delivery apps based on the same factors. The research is expected to disclose the target audience segregated on the criterion of geo demographic aspects and the effects left on them bring in a sudden drink in their lifestyle research study focuses on how different category of people are influenced by the online food delivery websites and mobile apps. The research implies on percentage analysis of the respondents where 57% of the people out of 100 respondents get influenced by the advertisements of the food delivery apps that they hear/watch/ read.