I was searching out something else and came across this supplement. Here's what it says about it....

"Promotes a feeling of fullness

High potency source of fiber

Makes an excellent addition to any weight-control formula
Glucomannan is a calorie free dietary fiber source obtained from the root of the konjac plant. Nature's Way glucomannan is specially grown and prepared in Japan according to Nature's Way's exacting specifications. Glucomannan is an excellent addition to a sensible weight loss program."

I have not tried it, but I recently read an article that said it stabilizes blood sugar in people with insulin resistance. I can't remember where I read it, I think it was an article about PCOS.