Hi lorelei!
I have never heard of Slender Weigh, but I think you may have touched on what will work. I have been eating low carbohydrate for a little over 5 months and I have lost 50-52 pounds. Up until I had read this book "How I gave up my low fat diet and lost 40 pounds!" by Dana Carpender, I had given up on losing weight. I have found hope now. I have over 100 pounds to lose still, but now I know I will be able to do it. It's not about eating less and low fat. What works is lowering the carbohydrates in your diet and eating more protein and vegies. Too many carbs make your body store the fat.
I have never trusted pills. I think it's important to figure out how to change the way you eat, so it can be a life time change and not a yo-yo diet. So I hope that helps...check out the book, it really helped me.
Lowcarbgal