Apologies for the long post, but i hope this helps:
Highly respected scientists Drs Mattson and Varady have written many papers on health / weight benfits of IF, which you can Google. Dr Varady's book (Kindle from 2 Jan) details a lot of human trials.
5:2 is an easier WOL than other forms of IF, with most days being NFDs during which the body can recuperate.
Many of the problems reported by women with IF don't really seem to be caused by IF, but by combining tough protocols for both IF - ADF or daily 16:8 - and very demanding fasted training - lifting multiples of body weight, increasing over time.
Additionally, some women who have formerly eaten clean have then binged on junk during IF.
Some women have excellent results on protocols like LeanGains and are evangelical about them.
Others have had good results for 6 months or so, then had injuries or health problems, particularly those women with very low (12-18%) body fat, possibly already with irregular menstruation, or with EDs.
Men seem to have few problems on IF, presumably due to differences in hormones, body fat %, metabolism.
Post-menopausal women also seem to have fewer problems.