Yes, parsley sprinkled on foods make them look pretty but according to researchers at the University of Missouri it does a lot more than that. Parsley is a very good source of apigenin, an antioxidant the researchers suggest can stop breast cancer cells from growing. Eating a few ounces of parsley daily is a good way to keep the apigenin in your blood stream. Other apigenin-rich foods include mint and celery. Another benefit of eating parsley is that it helps to control bad breath.