Absolutely right about that...losing weight for vanity's sake is one thing but losing it for health reasons makes it a life or death matter.
One's height can change daily.
You are actually are taller when you get up in the morning than when you go to bed.
It's got something to do with your spine getting compressed during the day.
Also those who lose a good deal of weight may experience a height increase.
Having less weight to carry around lessens the spinal compression and your general posture is more erect.
I noticed a gain of 2cms in height when I lost weight - and I'm only a short fella!