Get ready for some citations!
Fertility is ever changing in the female body by design. I've had some men contest the idea of using Marquette method by saying, "This is too much stuff to remember!" To which I respond: You are the one that's fertile all the time! Thankfully that fertile window is established by your brilliantly designed significant other.
Simply put: Fertility is possible through the cooperation of estrogen and progesterone. There are many hormones that influence estrogen and progesterone, but ultimately those two hormones are responsible for "ripening" the egg, and creating a "nest" for a fertilized egg.
Link number 1 below is a simplified version of how estrogen is stored in, and released from fat. Ketogenesis is a well-known state of fat loss or conversion (depending on the type of Keto), so therefore it becomes imperative to consider the implications of "rapid" fat loss on a person with high estrogen or progesterone. Over the years individuals with one sex hormone disorder or the other have noted the difficulty in weight loss, and then of course a feedback loop develops in which the person has an elevated sex hormone, and then weight causes more production of the hormone, and the sex hormone causes weight gain.
"Evidence supporting an interrelationship between insulin and fertility exists (Gong 2002, Hunter et al. 2004) but the mechanistic actions of dysregulated insulin functioning at a physiological and cellular level as associated with obesity, remain obscure." ( Mitchell, et al, 2005--reference number 5).
So this means that there seems to be relationship between fertility an insulin, but the research isn't sure of the type of relationship. It is possible, from my perspective at least, if inflammation is triggered by sugar in the blood stream that insulin can not mediate, that that same inflammation may have negative consequences systemically.
There are many anecdotal stories of people ceasing ovulation in a ketogenic state. These stories are generally older, and based on some old research on athletic women. The fact is, that in the US obesity has become a larger and larger issue (punny, right?) Estrogen related issues are also more prominent than they were 60 years ago. What some recent studies are showing, is that women with a higher fat percentage, or women who have irregular ovulation can be helped with a ketogenic diet. So, will a ketogenic diet make you ovulate? Not necessarily. But a Keto diet can help regulate a cycle, thus making ovulation more predictable. The link below is thread on Reddit about ovulation and cycle regularity on Keto:
https://www.reddit.com/r/xxketo/comments/19a517/keto_regulates_ovulation/
**note that these comments are also anecdotal, but at present there is no accessible study available, so this is basically a anecdotal rebuttal to more anecdotes. :)
1.The light description of Estrogen and Fat
2. Estrogen's relationship with body fat percentage
3. A REALLY good description of the estrogen/fat relationship (slightly more indepth than the livestrong article above)
4. A study suggesting that fat could be converted to estrogen through aromatization
5. http://www.reproduction-online.org/content/130/5/583.long
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