Hi,
If you are taking medication, be extra careful. I have found that despite my diet, my BG level was higher than expected so I did a little research and found this article:
(The page does not allow me to link the page so just Google "webmd glucomannan")
It says, that glucomannan lowers blood sugar. However, it also says that glucomannan decreases the amount of medication your body absorbs.
So instead of taking glucomannan together with Metformin, I have taken it an hour later and it resolved the problem.
It isn't a very good solution though... Metformin should be taken after food. Glucomannan should be taken before food...