I was 5x5 when I started, for about 6 months, then hurt my ankle and don't do much more than walk a couple miles now. I worked out in fasted state and then would eat shortly after, because I'd be so ravenous that I could eat just protein and still enjoy the meal.
I should get back to lifting (I'm just lazy), and it's possible that some of the other purported IF effects would kick in if I did so --- but the literature isn't encouraging, at least what I've read (I may be reading the wrong stuff!).
I should add: I'm in pretty terrible shape! I joked on Twitter about how, in the post-AHCA US, my wife Erin will have trouble getting insurance despite her constant exercise and diet regime, while I, subsisting on pork fat, nicotine, and whiskey, will have no trouble. I mean, I eat a green bean here and there, but for the most part I'm not joking. :)
I don't have a lot of health objectives with IF; it's just mostly painless and imposes some structure over what I eat and when I have to take time out of my day to eat.