Good news for ladies who like the woods—your period is (probably) not something that attracts (most) bears.
There are not a lot of studies addressing this particular topic, but a National Park Service paper published this year took a look at all of them and put the scattered pieces information together into a single puzzle. It's probably not a complete picture, but it's certainly better than hearsay and random, sexist stories you heard from your grandpa's drinking buddy. More importantly, even when there is a documented risk between menstrual blood and bears, that shouldn't be construed as a reason to keep women out of the wilderness. After all, bears are attracted to food, and we don't tell people they shouldn't eat while backpacking. Instead, we have practices that reduce risk. Same thing applies here.
Here's what we learn:
1) You can menstruate freely and without fear in the contiguous 48 United States. Grizzlies, and particularly black bears, don't seem to be interested in what's happening in your pants. Evaluating hundreds of grizzly attacks found no correlation between menstruation and risk of attack. In the case of black bears, this has actually been tested experimentally, with researchers leaving used tampons from various stages of menstruation out in the wilderness and watching how the bears respond. (Science!) The bears completely ignored the tampons.
2) Yellowstone data suggests food is a much bigger risk than menstruation. Analysis of bear attack data from Yellowstone National Park doesn't even consider attacks that happened before 1980. Why? Read the rest
Speaking of Todd Akin, Cory posted yesterday
about the history of the bogus idea that women who were raped (excuse me, "legitimately" raped) can't get pregnant from it, citing a medical/legal text from 1785. In a story at The Week
, we learn that this particular bit of misinformation is, in fact, even older than that, dating back to 1290
. So Akin is propagating a belief that has been spread—despite a complete lack of evidence to support it—since the 13th century. Good times. Read the rest
Kate Clancy is one of my favorite bloggers. An anthropology professor at the University of Illinois, she studies the evolution of female reproductive anatomy. Her blog covers science I don't see anywhere else—the human evolution, cultural anthropology, and behavioral science behind ladybusiness.
So Clancy's blog was one of the first places I looked yesterday after reading about Missouri Rep. Todd Akin thoughtful commentary on female biology. In a long, well-written, and (fair warning) rather graphic post, Clancy talks about what we know about rape—think of it this way, you know way more people who have been raped than who have a gluten intolerance—and the way that emotional trauma affects conception and pregnancy.
First off, there is absolutely no difference in the rate of conception between women who have been raped and those who had consensual sex. Clancy breaks this down nicely in her blog post, and even offers a surprising tidbit from the research literature that all people should consider—at any given day in a woman's cycle (even days when she is supposedly "infertile") there's about a 3% chance of unprotected sex leading to a pregnancy.
The impact of stress on miscarriage is a lot messier. I've mentioned here before that we know very, very little about miscarriage, relative to a lot of other medical issues. To paraphrase my family practice doc, when you start talking about conception and miscarriage you very quickly wander past the small amount of hard evidence and straight into voodoo. And also into the counter-intuitive nature of reality. Read the rest