Women trying to get pregnant should steer clear of fast foods and eat more fresh fruit instead. That’s the conclusion of a new study that followed the diets of nearly 5,600 women in Australia, New Zealand, Ireland, and the U.K. Researchers found that participants who ate meals at fast-food restaurants at least four times a week took nearly a month longer to conceive than those who rarely ate fast food. And while women who rarely or never ate fast food had an 8 percent risk of infertility—defined as not being able to get pregnant after a year of trying—the risk was 16 percent among regular fast-food eaters. Meanwhile, women who ate fruit at least three times a day got pregnant two weeks faster on average than women who ate fruit less than once a month. “It shows that healthier foods support conception,” study leader Jessica Grieger tells NBCNews.com. Researchers note that a high-fat diet has been shown to have a toxic effect on the ovaries of mice, and that fast food could have a similar effect on human-egg cells.