I did it, though I may have abused some stimulants in the process.
Last year I dropped from about 280 down to just south of 250 in the span of 7 weeks. Yeah, you read that correctly. I had a 7 week course in the city with about a 3 mile walk, round trip, from the station to the center, and I did nothing but drink water during the day. Occasionally I'd have a meal during the day but the following meal was a minimum 12 hours later, sometimes 24 hours later.
I couldn't do more more than 18 hours consistently so it might not fit some's definition of IF, but I just remember not worrying about food as much. My gut also felt much better and after the first 4 or 5 days of doing it, it became second-nature and I would stop feeling sick.
This was almost exactly a year ago. Once my course ended I was back at home and put back about 5 pounds since. Which isn't too bad but I find that not being active and moving about often and instead sitting inside books on a desk really makes not thinking about food impossible. But for 2 months post-seminar, I was 242ish, at my lowest.
But I did realize the difference between eating to live and living to eat and being honest with myself, when I have a craving, whether I'm really hungry or just bored. I became more self-aware after that.
My dad does IF once in a while too, but he's much healthier than I am lol. He deals with healthy weight loss in his clinic so he's well-read on IF and other "healthy living" methods. He's been veg for 30 years now and he's really doubled down on fruits and veggies and kefir when he eats. But I can't live like a rabbit.