A study from a Chinese lab referring to Western diets as toxic and a cause of depression?

A Western diet is a transferable thing. Just like in the US we hear about the benefits of the Mediterranean diet or the lower rates of some diseases in Scandinavia or Japan. China has had KFC since 1987. Korean restaurants often have Katsu. Japan has Kobe beef and steakhouses. It’s not some nationalistic plot to say that certain regional diets or their influences on a population are beneficial or harmful in various ways.

I don't think you need to go to China to find that people think the average north American eats terribly for their health.

I think given that 75% of americans are overweight and 40% is obese, certainly food would be a very reasonable first hypothesis of any neutral, objective scientist. I would be surprised if food you ate didn't affect energy levels, feelings of wellbeing, etc.

the term western dietary patterns has a more specific meaning: https://en.wikipedia.org/wiki/Western_pattern_diet