Productive is not what I'd call what I do but anyway: I don't follow things that make me miserable or even just "people". My feeds are full of all kinds of fun stuff, like my fandoms or science or art. So I don't ever "doom scroll", really, but read about what other people thought about that newest episode or some new thought they had about an ancient episode or general fan squealing about a ship or the newest weird findings about spinosaurus or 'look at these new photos Perseverance has taken' or 'look at this detail in this awesome painting' or 'this is how to improve this aspect in your drawings'.
Why those two in particular? And why on repeat instead of queueing several different ones? If you don't mind me being nosy for absolutely no good reason.
It's been a while but my most recent information was that this correlation couldn't be confirmed. Sorry, can't provide sources, just what I remember from a while back, so feel free to take this with a grain of salt.
That was a gazillion years ago. Probably some fandom thing? Seems likely.