I lost over 40 lbs a few years ago following the WeightWatchers plan. There isn't a specific "diet", you just find out how to calculate "points" for every type of food, and you quickly discover what sorts of food you WANT to avoid, and what portion sizes are appropriate to your goal. You get a certain number of "points" per day, plus a few "flex points" if you want to go over a bit, but sticking to your points total is important to achieve success. And what I found, is that after a while, you just get used to making the right choices, and it isn't so difficult. And, adding moderate exercises will increase the weight loss. Anyway, that's what worked for me.