Have lost six and a half stone in total, both post pregnancy (eat like a horse when pregnant and bf), once WeightWatchers (did lose weight but always felt hungry) once low carbing and mainly didn't really feel hungry (not Atkins - had a few carbs every day - it was more about measuring GL/sugar release levels, filling up on protein and veg).
Both times I would say I had to be very, very focused to do it. Plan ahead everything, keep a food diary, lots of self control and a bit obsessive about food, regular exercise prioritised etc. Doable, but not easy. It was also very, very boring.
Staying eating more or less like that (but not counting it, just eating healthily and occasional treats, at least once a week something like pizza and drinking alot of wine too) I stayed the same weight. It was very easy, and not boring, as I knew if I wanted the odd treat I could.
Then went to the US and put on half a stone in three weeks (!) as we were driving coast to coast and there was mainly only shit to eat and obv wasn't exercising as driving most of the time.
Then this summer I ran two 10ks and a half marathon (assuming I'd lose the weight) but was hungry all the time, especially for carbs/pasta, and didn't lose a single pound! Ok, I know muscle is heavier than fat, but also I think there's a limit to how much you can exercise if you want to lose weight, rather than get fit.
So am going back on the lowish carb, regular moderate exercise wagon for the new year to shift that pesky lingering half stone from the coast to coast excess.