Why Did We Care?

Yesterday was the bane of the existence of all normal girls - skinny ones, you are excluded from this broad category of females graciously but with an unhappy, joking half-smile borne of jealousy.
It was height and weight check.
Of course everybody had put on some holiday weight, but some put on more than others. In this new class where everybody was still strangers basically, people seemed to go into the room with a dread and while on that damned machine, would use their - surely chubby - bodies to block the view of the scale. An unwritten request to not announce the relevant weight as he wrote it down on his register passed between student and teacher, perhaps in the way that each girl came in, sneaked in, and tried to be light.
Why did we care?
I know not now,
But surely it was fair
that we should all know how.