Several observational studies have looked at the link between increased consumption of onions and a reduced risk of certain types of cancers, including stomach, breast, colon, prostate and ovarian. (bembu.com)
Plus, research shows that people who eat lots of broccoli may have a lower risk of certain types of cancer, including colon and bladder cancer. (health.com)
Studies have observed a trend in which lower concentrations of selenium correlated with an increased risk of certain types of cancer. (althealthworks.com)