Responses
It's obvious because they literally spend all day sitting still on a chair and eyes glued to the computer screen (most of them gets problems of eye sight as well at one certain point).
I know because I'm an artist myself, a victim (￣∇￣")
And to finish the chapters before deadline, it's pretty common to keep on drawing all night long with barely any sleep.
I think I see a lot of artist with health/physical problems after finishing a season or 2 (￣∇￣")