When I first started taking losing weight seriously, I actually thought I was dieting. I was passing up on cheesecake but not losing weight. And if you are not losing weight, you need more information.
Weight Watchers is excellent for portion control. When I learned the points system, what I saw I was eating about twice what I needed to lose weight. Helps to reset my mind of what a portion really is. Once you learn the points system, you just know it. Becomes something very natural. They have also just released an important update on their program called the Weight Watchers Momentum Program and I highly recommend you take a look at what we have written and learned so far.
You can also apply it to other diets like Fat Smash, The Zone, South Beach or Eat for Health.