When I was on the Jenny Craig diet I lost 2 lbs per week which meant I lost 8 lbs per month and in 1 year of sticking to the Jenny Craig diet I lost 96 lbs which was almost 100 lbs of weight loss in 1 year.
The Jenny Craig diet does work well as long as you follow through with the instructions and stick to the diet you will lose weight using Jenny Craig as it did work great for me.
It just takes time to lose a substantial amount of weight using any diet including the Jenny Craig diet because it takes time to safely lose the weight.