I remember the result of a survey done in the 90s, which concluded that the highest rate of M.E sufferers (Chronic Fatigue Syndrome - can be extremely debilitating) was shared between one other group (forgot who) and female Jehovah's Witnesses aged 18 - 40.
We had 3 female sufferers back then in the cong. (One genuine case, she was bed-ridden - the other two seemed able to turn it off and on at will - one used to lie on a reclining bed-chair at the back of the k hall, then when the meeting ended, folded it up herself and drove herself home. The other also lay flat out for the 2 hours she was occasionally present as well. As she was my sister-in-law, I know she found it quite easy to sit on a hard backless bar stool all evening at the pub getting rather 'plastered').
Alchoholism is a real hidden problem too. My 84 year old mother, a jw for 57 years has been an alcoholic for the last 40 of them (since my Dad died - she was convinced she would 'have him back' within a couple of years. The PO used to visit her around 11am off the ministry and she used to hide her glass of whiskey- one of several a day - between her armchair and the sideboard! This must still happen. I used to 'counsel' her on her drinking - it was so frustrating, she used to slur whilst glaring at me, "I can find my nosshe with my indecks finger, zo I'm not drunk".)
I knew at least three more, one a girl of 19 (she happily recovered very quickly when an MS asked her out (good job that prior he had never 'worked' with her on a Saturday morning as her breath could have ignited a match) - they eventually married). Also two married women in their early 40s. One of these had sadly contacted Hepatitis B via a forced- upon- her BT when she was a child. She married at 19 but due to her medical condition she 'had' to wait until the Noo Sistem to have kids. Hit 40, could have adopted in the meantime but resolutely declined - convinced one day 'soon' she would have her own, then suddenly realised at that age she may possibly never become a mother either way and spiralled into deep depression and alcoholism. The other was a circuit 'Barbie' in the 90s, who one day woke up and it was her 40th birthday. At 18 she thought she would never see 25. Now she herself had an 18 year old daughter and wore tighter dresses and higher heels than her daughter whilst they both 'paraded' at the assemblies, still trying to 'compete'.