A.
I am a HUGE propoponent of Weight Watchers. When I started, I was nursing and just incredibly busy, and exercise just wasn't happening (other than walks on nice days). But, the weight still came off fairly quickly. My husband started WW this summer and has had great results as well, and it's been more about diet than exercise.
I've tried several diets, and just general "eating healthy," but it took WW for me to really understand portion sizes and log the food that I ate to ensure I didn't overeat. Because sure, a chicken breast is healthy, but a serving is half of one, and I never did that!