The researchers theorized that human chorionic gonadotropin (hCG) that is often thought to be high in women with morning sickness may have protective effects against cancer. (babygaga.com)
There's more detail about breastfeeding and its protective effect against cancer here, and you can read a fuller discussion of the lifestyle risk factors linked to cancer here. (scienceblog.cancerresearchuk.org)
Conjugated Linoleic Acid (CLA) is a potent antioxidant and there is evidence that it has a protective effect against cancer, heart disease and other diseases. (wellnessmama.com)