In "Sleep, Sugar, and Survival" the author mentions that once upon a time babies were conceived in the summer because of the abundance of fruit and optimal vitamin D levels.
I've seen a lot of threads about birth control here, and I was wondering if anyone has tried this seasonal approach by not supplementing vitamin D, VLC/cutting fruit completely out of their diets October-April?
Or if they've noticed a more seasonal pattern in the conception of their babies after going paleo regardless of those specific parameters.
I'm reading this book right now and the advent of yearly fertility is one thing that is sticking out to me, as in "I don't know about this". I think Wiley is saying the change occurred with camp fire use, so it's definitely not Neolithic. For whatever reasons we have evolved to have a menstrual cycle instead of an estrus cycle and to have concealed ovulation. I think, as with most things, it's probably a little more complicated than-fire usage=year round fertility. This is a great question, I love all female related evolutionary theory topics, so I may have to research this one more.
I just finished this book a few weeks ago. It strikes me as very interesting, but I would like to see an updated version with new information and corrections. So little was known about leptin at the time they wrote it and there has been a lot of interesting information on other hormones such as ghrelin. Some of their theories seem highly speculative. And there are outright errors.
For example, they state that only carbs raise blood sugar, therefore stimulating an insulin release and fat gain. Well, protein also increases blood sugar (much less than carbs, but not insignificant). Even Dr. Bernstein recommends that diabetics shouldn't go crazy on protein, saying it can cause problems.
Ancient Bodies, Modern Lives is a very interesting book, and discusses how we wouldn't have been constantly fertile (and had relatively very few hormonal swings/periods). I can't remember if it covers food though...
This is only semi-related to the fertility issue, but it certainly hits upon a lot of other female hormone issues and is a fascinating read. Very long, but worth it! Really made me think about some of the "female troubles" going on these days, where they're all coming from and why.
It's kinda hard to read on the website b/c the column is so small, but you can download the pdf from the same link.