Before my injury I was 6'4" and 170 lbs (36 year old). When NL and I got married, I was 24 years old, 6'4" and 150 lbs. I have a light bone structure, and NL is/was an excellent cook.
Measure of my height while lying down seems to indicate some compression from 6'4" to 6'3"
Yes, I am thin. I eat just about whatever I want to eat and supplement my regular diet with Ensure/Boost. That is why I stated, you can't deny metabolism.
That said, by my nature, I just don't eat or crave large quantities of any foods. I, for whatever reason, naturally eat within moderation and portion control.