I have tried a lot of different diets in my life of on and off obesity. Truthfully I have always been obese, to the extent varies. Largest 340 lowest 185. I am 5'8" and should be around 135, that's never going to happen, but I digress.
I went on Weight Watchers (WW) a few months back after she has been having success with it. If you don't eat healthy you will have to change a to a healthy diet,we eat healthy but we over indulged in the wrong foods.
WW is a point based diet based on what you eat, I have been on it for about 2 months now and lost 20 lbs. I like it because it is sustainable and I only get hungry if I am eating a late meal.