Your stall may not be from the Metabolife, it may just be your body adjusting to the WOL or evening out after a big loss in the first few weeks. Since you only took Metabolife for one day, I doubt it would still be affecting you, so don't beat yourself up. In fact, a lot of people continue to drink limited coffee while low carbing and still lose weight. You will probably start losing again soon, so stick with it.