Ok...so the average man looking like David would probably be healthy. Some muscle mass from a bit of physical labor, walks or runs a good bit, doesn't eat too much and not too much body fat. There's nothing wrong with wanting to do enough activity to maintain your muscle mass, keep joints healthy and your body fat in check.

The mental disturbance comes in when otherwise healthy people get fixated on needing to change the size of their musculature, fix this or that muscle imbalance, years long drastic changes in diet to change their body, religious gym adherence even when they don't want to go, always thinking about what to do better to change their body, etc, etc

Mass delusion has taken over and made people think body dysmorphia is normal.

You've got millions upon millions of people out here who if they had those bodies would look in the mirror and see things wrong. They would feel inadequate, not manly enough, weak, scared, defective, etc. They would become fixated on changing their physique and like a lot of guys on a forum like this -- a large part of their life would center around making changes. They would derive "fun" out of making progress in seeing those changes. In reality those guys have perfectly normal and probably healthy bodies.

They all have good faces though

Well he's saying they are the best of the best so of course their face will look attractive. Having or not having their face doesn't mean a man should develop body dysmorphia in an attempt at compensating.

All comes down to what lengths one goes to to change their appearence. Strictly speaking, to diagnose most mental health disorders there needs to be established negative impact on person's day to day to life. If bodybuilding gets in the way of other **** in your life - you can argue it's pushing in that direction. For most people i'd argue that spending 90 minutes in the gyn x4 a week is probably a good thing.

I'd say if a negative perception about your body and need to change it to some idealized form permeates your mental space to the point of being the motivation for your gym visits and drastic changes in diet -- you are mentally unwell even if you get your other stuff done.

Only true if you are worse off than you would have been had you not went to the gym. There are levels to this and spending 20 minutes in the morning thinking about losing weight for vacation is different than staring at your self in the mirror for hours at a time.

If the extent of the fixation for an otherwise healthy person is only looking in the mirror and thinking he or she could stand to lose 5 lbs and tone up a bit -- true...I probably wouldn't categorize that as body dysmorphia.