I have no doubt that obesity increases the risks of pregnancy. The issue is how much of a factor has the increase of obesity been in the increase of pregnancy related mortality.
We agree that obesity increases the risk of mortality during pregnancy (and there are numberous studies that tend to bear that position out through empirical analysis of facts).
I guess the next step is to come to an agreement that America is getting fatter.
In the early 1960s, the average American adult male weighed 168 pounds. Today, he weighs nearly 180 pounds. Over the same time period, the average female adult weight rose from 143 pounds to over 155 pounds (U.S. Department of Health and Human Services, 1977, 1996). In the early 1970s, 14 percent of the population was classified as medically obese. Today, obesity rates are two times higher (Centers for Disease Control, 2003).
That's from an article titled
Why Have Americans Become More Obese? from the Journal of Economic Perspectives written in 2003.
http://www.google.com/url?sa=t&rct=...=J9n3tW_jgzvpU8TdSKVERw&bvm=bv.51156542,d.dmg
In 1990, obese adults made up less than 15 percent of the population in most U.S. states. By 2010, 36 states had obesity rates of 25 percent or higher, and 12 of those had obesity rates of 30 percent or higher.
Today, nationwide, roughly two out of three U.S. adults are overweight or obese (69 percent) and one out of three is obese (36 percent). While U.S. obesity rates have, overall, stayed steady since 2003, the rates are still rising in some groups, and disparities persist: Non-Hispanic black, Hispanic, and Mexican American adults have higher rates of obesity than non-Hispanic white adults.
That's from an article titled
An Epidemic of Obesity: U.S. Obesity Trends from the Harvard School of Public Health website.
Harvard School of Public Health » The Nutrition Source » An Epidemic of Obesity: U.S. Obesity Trends
Now, if obesity poses a serious risk (I consider it a serious risk, anyhow) or maternal morbidity, and American women are getting fatter by the day, I think it stands to reason that a good part of the increasing rate of maternal morbidity can be laid at the dorrstep of obesity.
Likewise, there are a number of studies that indicate that cesarean delivery presents an increased likelihood of maternal morbidity. Here's one (the abstract, at least):
Even without trial of labor, women after primary cesarean delivery were 10.3 times more likely to develop endometritis (95% CI 5.9, 17.9) than after spontaneous vaginal delivery. The risk of transfusion was highest in women delivered by primary cesarean after labor, 4.2 times higher (95% CI 1.8, 10.1) than spontaneous vaginal delivery. The risk of pneumonia was 9.3 times higher (95% CI 3.4, 25.6) after repeat cesarean delivery with labor. Deep venous thromboses occurred in 15 (0.1%) after spontaneous vaginal delivery, 2 (0.04%) after operative vaginal delivery, and 12 (0.2%) after cesarean delivery.
That's from an article titled
Maternal morbidity associated with vaginal versus cesarean delivery published in Obstet Gynecol in 2004.
Maternal morbidity associated with vaginal ve... [Obstet Gynecol. 2004] - PubMed - NCBI
You'll note that many of the complications that arise from c-section delivery (endometritis, pneumonia, venous thromboses) are cited in that CDC MPSS study that minnie616 provided earlier as being "classes" of conditions that are tracked as being involved in instances of maternal morbidity.
So I hope we can now agree that cesarean delivery increases the risk of maternal morbidity.
The following is from a website called Childbirth Connection:
Childbirth Connection: Information for Women on Pregnancy & Childbirth
More recent studies reaffirm earlier World Health Organization recommendations about optimal rates of cesarean section. The best outcomes for women and babies appear to occur with cesarean section rates of 5% to 10%. Rates above 15% seem to do more harm than good (Althabe and Belizan 2006).
The national U.S. cesarean section rate was 4.5% and near this optimal range in 1965 when it was first measured (Taffel et al. 1987). Since then, large groups of healthy, low-risk American women who have received care that enhanced their bodies' innate capacity for giving birth have achieved 4% to 6% cesarean section rates and good overall birth outcomes (Johnson and Daviss 2005, Stapleton et al. 2013). However, the national cesarean section rate is much higher. After steeply increasing over more than a decade, it leveled off at 32.8% in 2010 and 2011 (Hamilton et al. 2012). So, about one mother in three now gives birth by cesarean section.
Here's the link (you'll note that the references are cited in the text):
Why the National U.S. C-Section Rate Is So High | Cesarean Section
So getting back to the point I made initially, I don't
know that there are any studies that
difinitively prove that increasing rates of obesity and elective cesarean delivery are causing an increase in maternal morbidity rates.
But if it has been proven that obesity and cesarean delivery increase the risk of maternal morbidity to a signifigant degree, and it's been proven that rates of obesity and cesarean delivery have skyrocketed in America over the course of the last couple of decades, I think it stands to reason that there's a fair to middlin' chance that the increasing rates of obesity and cesarean delivery play a substantial role in what would appear to be a corresponding increase in maternal morbidity.
Can I prove that with cold hard facts?
I don't know.
Personally, I think the facts speak for themselves and you'd have to be, as I said, either overly politically correct or deliberately obtuse (or "something else") to not put two and two together.
But, no, I can't point to a body of acedemic and medical research and say, "Here. See? This proves it."
That said, I'm not in the business of proving these kinds of things.
I know that if my wife and I were still having kids I'd be encouraging her to not be obese or opt for an elective c-section.
You're welcome to make of all this what you will.