Well, I've been trying to diet and bicycle without much success for a while now. The year I lost 50 pounds, I was taking Chromium Picolinate, but stopped when I started having anxiety attacks (which I now blame on overtraining and caffeine) and then I threw it away when I heard about all the health risks.
Since I haven't been making any progress without it, I am trying a supposedly safer form of Chromium (Chromium Polynicotinate) and seem to be having results already after just a few days, with no other major changes. In addition to apparently increasing fat loss, it seems to make me more tolerant of hunger and I'm having much less of the constant compulsion to snack.
The people who push Chromium claim that it's a natural requirement in our diet which we're not getting enough of. I hope they're right, because I figure I'd better go on with it for a while...I'd like to spend some of my life at a normal weight, and nothing else is working for me.