If you have a disease that fucks up your metabolism and makes your body go haywire, why the hell would you choose the one profession where your top priority is keeping your weight stable? It's like if I were an ethical vegan and decided I wanted to work in a meat processing plant- what kind of sense does that make?
This is exactly what bothers me, explained in words I couldn't access when I tried to reply to gigi's 'condition' earlier.
If you have an illness which renders you struggling or unable to maintain a qualification for your job, why would you force yourself into that job, where (to be blunt) no one really wants you anyway?
This reminds me of how I felt when the Hunger Games movies came out. I'd never read the books really because they're not my genre, but I understand the gist of them and most other post-apocalyptic light-sci-fi young adult novels with ordinary yet innately 'special' teen heroes. In this particular formulaic shitshow, the main character was literally starving! It drove the entire plot of the Hunger Games!
These people were so hungry that they were willing to risk their lives - knowing 6/7 or whatever of them HAD to die, and that those odds aren't good - in order to win and obtain food and a better quality of life for themselves and their communities.
Now, it's my understanding that actors must emotionally and physically transform into their characters in order to fulfill the role. That's the art. The crew helps, of course, but it's the actor who has to make sure they are the perfect physical canvas for those crew members to work on.
Jennifer Lawrence refused to lose weight from her average (not actor-average...non-performer civilian average) frame. She refused to lean down to play a poor teenager in a post-apocalyptic world where everyone in the character's 'district' was poor, and she in particular was starving to death.
The Hunger Games' audience
not only allowed Jennifer Lawrence to go on unquestioned about her decision to undermine the art (which earns her millions of dollars per year), but
praised her for this unprofessionalism. It was hastily explained away (can't remember if by Jennifer herself, or by the internet on her behalf) as a choice akin to activism for feminism - HA! Activism... of course.
Why do people do this?
If you cannot, or do not want to, achieve the qualifications for a job - and that could mean coding certifications for a programmer, a medical license for a doctor, strength and stamina for a pro athlete, or the body to act or model like Jennifer and Gigi, respectively) -
don't force your way into the position with your name and half ass the job.
Don't be so arrogant as to take the place of a person who could have performed better, and don't sacrifice the quality of the art you're involved with because you can't or don't want to be the canvas your coworkers need.