Whatever, I could eat twice as much as everyone else and can't gain weight (60 kg at 185 cm:shifty
...
Were your blood fat levels checked recently? If not, I'd recommend doing so.
I had that mode running from adolescence to around 30, and now I'm fighting high blood fat levels, although my BMI is around 22. Doctor said my body can't properly convert fat from food into "usual" fat cells, so I can eat much but don't gain weight. Instead, my liver has to handle the fat and eventually dumps it into the blood. You can guess that that's not healthy...
IMHO, doctors, trainers or body-coaches that use the BMI as single yardstick for weight goals should be avoided at all costs, as they can do more harm to people than McDonald's.
Also, I see the current "body-cult" as pretty dangerous. Weight and shape is only one aspect of a healthy body, but is treated as the be-all-end-all in society.
Oh well, at least at Facebook they can do the Photoshop diet. Just like the real models do...