What this thread has shown is how we are all different.
I lost four stone two years ago, and have managed to keep it off. I did low calorie, and my appetite which I always thought was huge, actually wasn't. I managed really well on three smallish healthy meals a day, lost a couple of pounds a week. I thought I'd be starving, but after the first week, I adapted to much smaller portions. My tummy never rumbled, even though I was eating so much less.
I keep it off by controlling what I eat - I'm 60, and it is true that you don't need to eat as much when you're older. What works for me is no snacks, natural foods, limited unrefined carbs, no sugar. And proper portion control too.
A typical day - a couple of spoons of Greek Yoghurt at breakfast (I'm not hungry but have to take meds with food). A rice cake mid morning if at work, don't bother if at home. Lunch - small bowl of overnight oats or microwaved porridge. Small portion of dried fruit. Small slice of fruit loaf. I drink loads and loads of water throughout the day.
Dinner - small portion of lean protein, usually fish or chicken. Lots of leafy veg or salad. Couple of new potatoes. I only have rice/noodles/pasta twice a week max. I don't eat bread. I don't eat pastry, cakes. I do have a couple of nice chocolates in the evening if I fancy them, but only a couple.
It's about portion control and controlled carbs for me. BMI about 20.
I work with people who are naturally slim - but as soon as they gain a little, they cut back, refuse the cakes/biscuits/crisps that always sit in the staffroom. The overweight people mindlessly eat the snacks, and their normal lunches. There's a lot to be said for mindful eating.
It's a bit boring, but second nature to me now. And worth it, so worth it, I feel so much better.