I've been wearing my GWF for 2 months now, and I have not lost a single pound. I have no idea what I'm doing wrong. I am very anal about inputting my food intake. I measure and weigh everything. The computer shows a deficit of 250-500 calories everyday. You would think I would have lost at least 4 pounds in the last 8 weeks, but I haven"t even lost 1/2 pound. I'm beginning to think the machine is no better than just using my sparkpeople. The only thing it seems to do is calculate my sleep.