Researchers at George Washington University have linked fast-food consumption to the presence of potentially harmful chemicals, a connection they argue could have “great public health significance.” Specifically, the team found that people who eat fast food tend to have significantly higher levels of certain phthalates, which are commonly used in consumer products such as soap and makeup to make them less brittle but have been linked to a number of adverse health outcomes, including higher rates of infertility, especially among males.