It's a principle thing...I decided when I hit the 215# mark (that put me in the upper end of "normal" for my height) that I wanted to be solidly in the middle range...and that's at 205#...even if I see it on the scale for only one morning (I jump on each day after my appropriate bathroom duties: pee, preen and prepare for the day).
call me pig-headed, stubborn and obsessive... lol