Stephanie Mencimer, Mother Jones:

Way back in 1988, the World Health Organization declared alcohol a Group 1 carcinogen, meaning that it’s been proved to cause cancer. There is no known safe dosage in humans, according to the WHO. Alcohol causes at least seven types of cancer, but it kills more women from breast cancer than from any other. The International Agency for Research on Cancer estimates that for every drink consumed daily, the risk of breast cancer goes up 7 percent.

The research linking alcohol to breast cancer is deadly solid. There’s no controversy here. Alcohol, regardless of whether it’s in Everclear or a vintage Bordeaux, is carcinogenic. More than 100 studies over several decades have reaffirmed the link with consistent results. The National Cancer Institute says alcohol raises breast cancer risk even at low levels.

I’m a pretty voracious reader of health news, and all of this came as a shock. I’d been told red wine was supposed to defend against heart disease, not give you cancer. And working at Mother Jones, I thought I’d written or read articles on everything that could maybe possibly cause cancer: sugar, plastic, milk, pesticides, shampoo, the wrong sunscreen, tap water…You name it, we’ve reported on the odds that it might give you cancer. As I schlepped back and forth to the hospital for surgery and radiation treatments, I started to wonder how I could know about the risk associated with all these other things but not alcohol. It turns out there was a good reason for my ignorance.