??? It depends on the health condition you're born with, as actually and you CAN be born with health conditions that will result in you being unhealthy thin... I was born with a health condition and take meds that affect my weight and always get complements about how 'healthy' I look when I'm at my worst health moments because I 'look thin'. It's extremely frustrating because 1) I'm sick as hell and being told I'm healthy 2) When I am healthy and have gained weight I'll be told I look 'unhealthy' or 'lazy' (but this is going a little off topic though so back to tropes)
I want to stress this, but I'm not saying YOU have to dislike the trope, or even that I 'hate it every time I see it' I'm just explaining why I and other are not a huge fan of it because of the reasons stated (I just like over explaining I'm sorry, I'm not arguing or fighting with you if that what it looks like xD just kinda got me started in explaining stuff I like talking about), AND because that I think the trope can be improved if people included more than just the 'looks' of the condition in the story. Like I said very early on in the thread, I really liked how then handled Tobias in the Black Lightning TV show in concerns to that character having albinism.
Prosthetic are another similar example in games and anime that get thrown into another trope I'm not a fan of, I really dislike when writers will throw in super powerful prosthetic arms or show how cool it is to have robot limbs while completely ignoring the physical and mental effects prosthetic have on a person, BUT, like the albinism trope, I can still find series that I like it in, Full Metal Alchemist is the most obvious example, as it used the trope while paying attention and respecting the original base source it was inspired on by including a lot of the negative elements both physically and mentally that came with having artificial limbs despite them being pretty powerful and fantastic in that story. The characters with automail were still damn cool, they still kicked ass, but they were still disabled and didn't ignore that fact, it was really amazing.
I think my issue with tropes like these that are based on disabilities is that it could be so much more than it is and add a lot of layers, complications and nuisance to the story and characters if explored, but the majority are usually only used for the visual / cool factor when they could be doing a lot more, it doesn't even have to be a plot point just be aware as a writer your characters will have these nuisances and have that silently reflect on the characters in the story, it'll just give them a lot more depth.