Doomscrolling is just not that useful when you compare it to like, basically anything else you could be doing with the time, like exercising, reading a book, tidying around the house, just relaxing with your thoughts, etc.
The logical extension of constantly doing stupid stuff (like eating bad food, not exercising, not having a fulfilling life) is indeed physical or mental health problems.
The answer is just to take a step back and examine your life. Are you spending your time doing things you want to do, or are you being driven around on autopilot?