Originally Posted by
atomic sagebrush
Unsatisfying answer - we don't know. I believe that if you are already very thin, then 2-3 weeks of diet may very well be enough (because blood sugar/pH/EWCM seem to change very quickly and while testosterone and estrogen take some time to drop, if you're already low body weight you probably have less T and E than others do anyway) and additionally the majority of people do not get pg the first month of swaying anyway and most people have to drop at least some sway tactics to conceive, and so that ends up being 6 weeks by default.
You also have the option of starting a vegan/vegetarian diet (for pink, that is) while keeping cals high and do that for a couple months before hitting it very hard on diet. This may help lower your T and E levels without causing you to dry up and blow away to nothing.