Oh boy… It’s so validating to finally find this subreddit and see this question being discussed more – but also so frustrating :( YMMV, but in my case, I’ve been on the IF wagon for 2.5 years now, which has also coincided with 2.5 years of almost no periods. I menstruate only on the rarest of occasions, 2-3 times a year, even though I’m always hovering around the healthy/overweight BMI line.
I’ve done all the hormonal tests – and apart from subclinical hypothyroidism, and high cortisol levels which form a vicious cycle with insomnia (pandemic pals, where you at <3 ), there is no gland-related issue that could explain the amenorrhea.
I’m coming to the conclusion that the last factor I’ve yet to n=1 experiment with is the IF, and I hate it. This way of eating has done such wonders for my eating habits and daily life in general, and I don’t like the idea that I might have to give it up. But, as the supportive weightloss subreddits kindly remind us, every body is different, and maybe some just throw tantrums and disagree with IF :/
Anyway, must keep in touch with this subreddit re. the period stuff. Good luck, fellow (non)menstruating people!
Edit: typos