I've not read the whole thread so apologies if I repeat anything other posters have said.
I've been overweight all my life, so was my mum, my gran etc. As a child, I was comforted with food, rewarded with food, encouraged to eat everything on my plate to the point of being uncomfortably full. As a result, I have no concept of portion control and I really struggle with willpower. I have tried WW a couple of times and, each time, have lost a stone or two very quickly, then got very bored and put it all back on, as there's no way I can count points on everything I put in my mouth for the rest of my life.
However, I joined SW a few months back and it's been a revelation, as their way is more focused on what foods you can fill up on, and making changes for life. I've lost a couple of stones so far and haven't felt like I've been depriving myself. I've learnt to fill up on their "free" foods; fruit, veg, pasta, rice, potatoes, eggs, lean meats and fish, but go easy on things like bread, cheese etc. I allow myself a treat every day, but pick something like a small milky bar or a freddo, as oppose to a kingsize mars bar like I would've picked before.
It's only small changes, as I've always eaten a relatively healthy diet, but I would eat large bars of chocolate, too much cheese, not cut fat off meat etc. and I'm slowly learning that these things make a difference.
Fortunately, my ds doesn't seem to have picked up on my attitude to food and that's how I would like it to stay. I'm not huge by any means, but was a size 18-20 at my biggest (down to a 14-16 now) and realised if I kept eating as I was, I was only going to get bigger and get all the health problems associated with that. I agree that faddy diets don't work and , ime, WW isn't a diet that is sustainable for life, but, for me, SW is working and is teaching me to eat healthily for life. I know I could've done this on my own, but I need that kick up the ass of going to a weekly meeting to spur me on!