I lost 40lb the conventional wisdom way about 8 years ago. I.e. Lots of exercise, low fat, calorie restriction, 6 small meals a day. I was highly motivated and I'm an all or nothing type, so I was able to get where I wanted, lean and fit.
It wasn't until about a year ago, after picking up some parasites in Asia, that I started having very serious IBS issues, that doctors didn't want to know about that I stumbled over the paleo diet.
Until then I had kept the weight off, but if I wasn't careful about what I ate and my exercise it came back fairly quickly. As an athlete that wasn't too much of issue until the off season, where the weight could build reasonably quick i.e my diet wasn't quite as good as I wasn't quite as active.
Since going paleo weight maintenance has become a thing of the past. As in I don't need to do anything conscious to keep a very lean stable weight. Too add to this experience I've been recovering from a foot injury the last 4 months so my activity has been almost nil, and I've still maintained my weight without effort.
There are a couple mechanisms at play here, the first is metabolic derangement, or where you're insulin resistant and leptin resistant, from a 50,000ft view these two hormones are key to weight regulation as well as appetite regulation. As your diet changes and life style changes (i.e. better sleep/stress, some activity) you will hopefully start becoming more insulin & leptin sensitive, or your metabolic system will start working again.
If you're overweight you should have plenty of leptin, and once your brain becomes leptin sensitive your body will know it is carrying to much stored fuel (fat). And once you're no longer insulin resistant your body will be able to access it's fat store as energy. The result? You naturally won't be as hungry as your body burns more fat for fuel, rather than demanding that you feed it more from telling you that it's hungry.
(Okay, long winded... but we're almost there..) So once you have reached a lean weight you don't really have to do anything but keep a clean paleo diet. Your body will naturally tell you to eat a bit more, because you don't have the excess fuel as fat, and that mechanism will very easily keep you weight stable and very healthy.
A caveat to the above is the potential long term damage one may have done to their metabolic system. From my reading it should be mostly reversible most of the time, but it is still a very new area of research to fully understand all of the parameters currently.