I read that as "crash dieting" (voluntary or otherwise). Not enough protein, vitamins and trace minerals, interupts the anagen hair growth phase and all sorts of other nasty side-effects including (but not limited to) bone-loss if you are not getting enough calcium and vitamin D.
M-47,W-40,No kids D-filed 5/27/2010 Piecing - 10/21/2010 -=Soon to be banned=-