Same thing happened to me at first, I was doing weight watchers (points) and actually still gaining weight. That's when I started doing Atkins, part of my PCOS is insulin resistance - which in really broken down terms means that because of the PCOS my body doesn't process carbs correctly, in a normal body it will take carbs, initially burn them as energy, and any carbs it doesn't use turns into fat - if insulin resistance is one of you symptoms, your body is basically confused by carbs, skips burning them and turns them directly into fat... then you have to work twice as hard to get rid of them, and you're twice as tired because you're body isn't producing any of the natural energy you get from that step where it burns the carbs for energy. Now, the reason why low carb works is because if you are religiously working out, and not taking in as many carbs (think between 20-40g a day), your body isn't busy turning carbs into fat, instead it goes into shock and starts burning your fat for energy (and most people find that after about a week without carbs, their energy shoots up) which in turn causes the weight to come off.
I hope that made sense. If you want to continue doing weight watchers, you can try to pick things with points values that have higher proteins and lower carbs, or you can do the core plan, which is a low carb plan, they just don't like to advertise it that way.
Hope that helps!!
"That sweater doesn't make you look fat... Your fat makes you look fat, that sweater just makes you look purple" -BTVS
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