A study by researchers at the University of Toronto shows that fast food makes us impatient:

Eating habits have shifted dramatically over the last few decades–fast food has become a multibillion dollar industry that has widespread influence on what and how we eat. The original idea behind fast food is to increase efficiency, allowing people to quickly finish a meal so they can move on to other matters. Researchers at the Rotman School of Management, however, have found that the mere exposure to fast food and related symbols can make people impatient, increasing preference for time saving products, and reducing willingness to save.

This makes me think about the more general inefficiency of being in a hurry. Rushing to get things done often results in a bad job, and promotes disorganized thinking that in the end costs you more time than hurrying was supposed to save. I hurry a lot, but I am trying to get better about it.