Before Weight Watchers, I thought what I was eating was good for me. I'd eat peanut or almond butter, because I knew they were good fats and full of protein, but after starting the program, I realised those items were high on points value for a very small portion. It's not that nut butter is bad for you, it's that it might not be ideal for losing weight.
I've had this experience with many foods and, empowered with this new knowledge, I'm now making the right choices. In my opinion, learning more about the foods you're eating and from the community that Weight Watchers gives you is key to the success this program has had over the years.