Reach for Tomatoes. A diet rich in fruits and vegetables has long been tied to a reduced risk of disease, and even if you can’t agree on which camp tomatoes belong under, the latest science shows they offer a significant health benefit to women: reducing breast cancer risk. In a new study published in the Journal of Clinical Endocrinology and Metabolism, women who ate a diet rich in tomatoes for 20 weeks showed an increase in levels of adiponectin, a hormone that plays a part in the regulation of fat and blood sugar levels, lowering their breast cancer risk.