Facts and Figures On average, people buy food around twice a week from fast food restaurants. However, teenagers eat out more often. The majority of teenagers eat at fast food restaurants approximately three times each week. The survey also showed that teenagers made up almost two-thirds of the customers of pizza and burger restaurants, over half of the customers of chicken restaurants, and around 4 in every 10 of the customers of fish and chips shops. None of the teenagers interviewed said that they didn't like a particular kind of fast food.