Go ahead, eat the garnish. It may just prevent a type of breast cancer from spreading, according to an article published in the American Association for Cancer Research. Researchers say the compound, apigenin – found in parsley – kept certain breast cancer tumors from developing or spreading in rats. That said, more research is needed, but these findings may help women with or who have had breast cancer. Apigenin is also found in artichokes, basil and celery.