Now if you didn't know this, it seems that diet, stress, infection etc. may determine the sex of the offspring.
Recent study linked human mother stress to female offsprings. Before that we had mices http://www.biolreprod.org/content/71/4/1063.full
This is interesting:
In particular, a diet high in saturated fats but low in carbohydrate leads to the birth of significantly more male than female offspring in mature laboratory mice, whereas when calories are supplied mainly in the form of carbohydrate rather than fat, daughters predominate.
Can we have some mom input here ? What did you eat, what was your level of stress, did you have any chronic infections at the time of pregnancy and what was the sex of the output ? :)
I don't buy it with humans. In the USA at birth 1.07 boys born per girl. Strangely enough, worldwide, the birth sex ratio is 1.07 boys per girl.
That would suggest that on average, everyone's life is just as stressful and everyone has on average the same diet as in the USA.
In livestock many folks swear that adding apple cider vinegar to animals' drinking water will alter the sex of the offspring. Their theory is that the acidic vinegar acidifies the reproductive tract and that Y sperm aren't acid-tolerant, while X sperm is. It's an old-wife's tale though. But something a bit more complex than pH seems possible.
I think that it's more complicated than 'whatever sperm gets there first'. If you've ever seen videos of the moment of fertilization, there are usually multiple sperm present at the same time; the egg accepts only one. As far as I've read no one knows what influences this 'choice'.
The woman's body/egg cell having some say is the only explanation for crazy cases like my fiance's uncle, who had 7 boys with his first wife and 6 girls with his second wife.
There hasn't been a boy born in my family for 35 years. We're all carb lovers... we'll see what happens when my saturated-fat-loving self tries to get pregnant.
Don't know if there's anything to this, but my experience does support the idea posed, I was VLC for the months leading up to conceiving a boy. Being roughly 50/50 odds, that isn't exactly landslide proof in my mind though.
If you wanted to "sell" LC paleo to societies that prefer male offspring, this would be a good angle to work.
Here's some Mama input...during my first pregnancy, I was a strict vegan, and while I had a pretty mellow lifestyle, I moved houses while pretty far along, and got married, plus I was working several jobs, all with young children...so, yeah, there was some stress there. I gave birth to a girl. During my second pregnancy, I had been eating a WAPF based diet for over a year, and I'd been eating low carb for several months when I conceived, and had no major life events. I gave birth to a boy. So my experience fits into the theory, but I have vegetarian friends who eat heavy carb based diets and have tons of stress who have given birth to several boys. I've always thought that some men just tend to have more of one gender, and that you can guess at their predisposition by looking at what gender the father of the man in question tended to have more of...of course that information only works in larger families. My father fathered five children, four of us are female. The only male thus far has fathered one daughter...it's all so interesting...
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