No, viewed scientifically there are no "clear" links that food causes mental health issues. There are only vague leads that the food you eat may have an impact on your mental health, when you have anxiety disorders or depressions. The problem is you just don't understand what you read. Were not talking about feeling dizzy, sick or weak. We're talking about mental health, which has nothing to do with things like that. And just to be very clear. I'm not saying that food doesn't have an impact on mental health, i'm saying that food is
not the reason for the decline of mental health.
Anyway, the post i've referrenced was not made by Tyler (which doesn't make it any more true what he said). Someone wrote "...gut health is extremely important and improper gut flora leads to all kinds of mental health problems", which is the bullshit i've called out.
You may want to educate yourself before propagating nonsense based on an non-existent knowledge, i.e. start with something easy like
https://en.wikipedia.org/wiki/Epidemiology_of_depression. Educate yourself about what people eat in these countries (e.g. processed food vs non-processed) and enjoy the feeling of gaining true knowledge not based on ten minutes of reading some studies without any context. Just stop being such a nonsensical keyboard warrior.
It is mentioned in the study...you have linked. You may want to read what you refer to as your source,