I know it's so frustrating, but try not to let the scales get you down. This kind of thing is measured over the long haul, not day to day, so you might want to skip the daily weigh-ins if they are going to upset you. Most of the fluctuations are due to water retention or dehydration. Eating fewer calories and/or exercising extra one day does not automatically translate to a lower weight the next day. And it works the same in reverse - eating a little too much or skipping a workout won't make you gain weight overnight, either. It would be pretty much impossible to either gain or lose a pound of real fat in one day, so take heart. Stick to your program and it *will* happen.