I don't know if it's been mentioned... but while I agree with CICO to a certain extent (well obviously you have to keep your calories under control or you WILL put on weight), the composition of the foods you eat is still super important.
I was reading "Primal Body, Primal Mind" the other day, and it mentioned the results of a 1956 experiment where overweight people were put on varying diets of just 1000 calories a day (so obviously it was calorie restricted for ALL people and all macronutrient ratios). 1/3 of the people ate 90% carbs, 1/3 of the people ate 90% protein, and 1/3 ate 90% fat. Those on the carb diet actually GAINED an average of 0.24lbs a day, those on protein lost 0.6lbs a day and those on fat lost 0.9lbs a day.
Again, all very low calorie diets, but WHAT they ate seemed to be the key to how much they lost. To be honest, I'd like to see the results in people eating more than 1000 calories a day. That's too little for most people, obviously. And I'm not suggesting that all those who struggle to lose weight despite doing the "right" things should suddenly go on a 90% fat diet of 1000 calories.
So yeah, haven't read the entire thread (hell, it's pretty long and I read the first 13 or so pages and the last couple), but I thought this was something worth pointing out. It can't just be a matter of calorie counting, but ALSO considering the macronutrient ratios.
I've actually had a good long think about this thread overnight, because I'm afraid I was slipping into more of the mindset that if I just eat paleo/primal then my weight will start magically dropping off... but I'm one of those women who has struggled with weight for a long time, yo-yo'd etc. etc. so I'm starting to think this isn't going to be the case for me. Obviously I'll have to watch my calories, especially if I plateau... but I'm also looking at WHAT I'm eating and the effect it potentially has on me. If I have to stop eating fruit for awhile... I'll do it (not something I would consider doing FOREVER, but temporarily, yes).
Oh, I'm also extremely short so that doesn't help... an ideal weight for my height is about 100lbs... I obviously won't ever be able to eat as much as a normal sized person (woman or man!). I tend to put on muscle fairly easily (I haven't worked out in a gym for a few years now... being as it wasn't financially feasible, but just lifting heavy boxes of wood and doing push ups for roller derby training has made my arm muscles surprisingly large... and I haven't been doing it THAT long, I'm pretty sure if I were to get into it more seriously I'd get even more muscle... to the point where I'd look funny ). Soooo... this may mean I'm not estrogen dominant, as I must have enough testosterone to actually be able to build muscle with relative ease (of course, I know very little about the topic).
I figured I'll stick with what I'm doing right now for a month and see what the results are. If nothing much happens, I'll start switching things around a bit. I think given that we're all different (and it's annoying as hell that some people seem to think that if everyone did the SAME THING they'd all be the SAME when this is quite clearly not the case) we all have to experiment with ourselves to find out what works. Even given our personal preferences, some diets will work better than others because we'll be able to stick with them better. If you're never, ever able to eat foods you enjoy, you'll struggle to lose weight because it's just soooo bloody hard to do. If you're able to eat food you enjoy every day, it's not going to be as much of a trial. Yes, there will probably always be some stuff you love but can't eat... you just have to focus on the stuff you CAN eat and enjoy.
So that's where I'm at now, after just a few weeks into a primal eating plan (before which I was following more WAPF guidelines and loving my "properly prepared" grains... it wasn't helping my weight...). I actually found it easier than expected to dump the grains (I really just miss brown rice and occasional oatmeal... I go okay without bread... although if my kid wants Pizza Hut on his birthday I'm really going to struggle! It's one thing to avoid food when it's not in front of you, another entirely to sit around hungry when everyone else is eating).