Meat and mental health: a systematic review of meat abstention and depression, anxiety, and related phenomena
"The majority of studies, and especially the higher quality studies, showed that those who avoided meat consumption had significantly higher rates or risk of depression, anxiety, and/or self-harm behaviors.
Our study does not support meat avoidance as a strategy to benefit psychological health."
https://pubmed.ncbi.nlm.nih.gov/32308009/

Whatever happened to that fucking weirdo?
The mental health of the country and probably most of the planet is in the shitter.
In short there's a mass psychosis largely brought on by social media and the internet as a whole. Just about every unhealthy thought or emotion you can possibly have is stoked by the internet. Not to mention, your particular algorithm will specifically hit on topics most likely to piss you off, cause you fear, anxiety, hatred, little by little. It also ensures that any 'conspiracies' you harbor are affirmed.
Thats just a byproduct of the internet and social media, on top of that there is the intentional social engineering going on too.
There's all sorts of factors but thats the main culprit.