Patsy,
I wouldn't worry too much about this issue... The candidates that the medical staff want to eliminate are those who are grossly overweight (and therefore possibly incapable of carrying out their duties without suffering fatigue). 4lbs here or there isn't going to prevent you from being a pilot.... jeez have you ever seen the circumference of a long-haul LHS occupant?!!
Get that app. in!
LAU.