Oh, I'm not stressing at all. It's water. It may even be a good sign because my biggest whooshes have usually been preceded by several pounds of gain over the span of a couple days (sometimes six or seven pounds). Also, I may have gotten a bit dehydrated over the last few days and my body is reclaiming water. Plus, I've significantly increased my fiber intake and that may be playing a roll.

Whatever it is will work itself out (literally). That's one advantage of doing strict portion control -- I absolutely know that I have been towing the line right down the middle, so these bumps in the road are not hurdles or obstacles, they are just bumps.