(Almost forgot — coffee also reduces risk of breast cancer)
The article states that:
The team found that about half of women have a gene that links breast size to coffee intake, The Local reported. Healthy, premenopausal women with the gene who drink three or more cups of coffee a day have smaller breasts. Those women also have a lower risk of breast cancer. It's not the caffeine that does it. For carriers of the gene, coffee counteracts effects of hormones that can be carcinogenic.