I've been eating OMAD for about a year and I've lost 5 stone.
What I eat has drastically changed too - because it I'm only eating once a day, I want that good to be as nutritionally good as possible. I eat a lot of homemade vegetable soups with a huge range of veg - so I get most of my 5 a day and a wide range over the week.
I eat avocados and oily fish on alternate days too.
I also add ground seeds to my soups for a bit of extra nutrition.
When I'm working, I'll eat an early dinner (around 5ish) so I'm still not hungry going to bed, but at weekends, I have my one meal around 2pm. I think the research shows that early eating windows have the biggest benefit, but I'm never hungry in the morning and would feel weird eating lots of veggies for breakfast, so I prefer later in the day.
It works for me and I'm rarely hungry, unless my period is due and I get like a ravenous beast. I still usually manage to hold off eating even then, though.
I will have days off for big events - and if I'm eating out with friends I will eat my one meal with them, relax a bit and get back on it the next day.
I can't tell you how much better I feel for eating this way. It is a truly ingrained habit now.
The only problem I have is that it has become so normal that I'm still losing weight and have reached a point where I don't want to lose too much more. I will have to start working out how to balance it out so that I get the benefits of the fasting without losing any more weight.
Any ideas would be welcome.