1) Programming is a sedentary job, if you don’t take care of yourself (some sport, weight lifting, something keeping you active) you will feel physical strains over time.
2) Burnout is a possibility, I’ve seen programmers that had burnout, not self diagnosed but actual burnout. It was not pretty. Ever since I try to watch out for my mental healthy. It is easy to be put under enough pressure to break or even put yourself under that pressure (imposter syndrome …)
3) General negativity and naysaying. Part of the job is finding problems, debugging and generally poking holes in ideas so you don’t waste a lot of time implementing stuff that is impossible to begin with. Don’t let this become a part of you, don’t even let this take over in your job. It will rob you of the joy of programming.
That is what I gather from articles I’ve read over time and from myself. I am not aware of any research, just anecdotal evidence.