I have mild PCOS and found that it was slightly harder for me to get into ketosis than some others report. I'm not sure if this is related to PCOS though or the fact that i'm very inactive as i work from home on my computer all day (being active means you burn up your glycogen stores quicker, hence into ketosis faster). I haven't been on Exante long enough and consistently enough to reach ketosis yet but i suspect from looking at the amount of grams of carbs in the packs, that it will be harder for me to get into keto than on some other diets with less carbs. The carbs are around 54g a day on this diet, maybe slightly more if you add bars. I know for me this will probably only show up as very mild ketosis on the ketostix or maybe even only as trace readings... i think some diets use 30g a day as the threshold and i find i enter keto much easier/faster doing these.
Now, i'm talking here merely about time taken to show a keto reading on the ketostix. Physically, i find hunger starts to diminish after the 3rd day is complete and i start getting carpet tongue and bad breath, which is usually some time (2 days or so) before ketosis shows on the sticks.
I'm no medical expert, but one of the signs of PCOS is high testosterone levels. I have high testosterone levels myself and all the nasty side effects that come with that. But testosterone has one positive side effect which is that you also burn calories faster/lay down more muscle than those who are low on testosterone. So in theory at least, i feel that maybe keto should be reached quicker for people with PCOS than without. Not taking any medication into account of course.
Hmm,... confusing...