I measure my weight, bodyfat, water % twice a day on a Tanita digital scale -- one of those most recommended on the BF. Like most cyclists, my weight tends to increase by a few pounds in the off-season and I get down to racing weight during the season. Over the course of the year, my weight may fluctuate as much as ten pounds.
But my bodyfat and water% don't fluctuate much at all.
This year, I have lost seven pounds -- at a rate of less than one pound per week -- but my bodyfat and water numbers are still pretty close to the same. I suspect my power is up quite a bit because my speed for a given heart rate is up (but I don't have a power meter to verify it).
What's going on? Am I doing something wrong with my training/nutrition? (Or are these scales just not that accurate?)