Yeah, I think it's very easy to say that "life being stressful is not an illness." In reality, life is often stressful in ways that can very much lead to mental illness, particularly in a society that drastically values corporate success over human well-being.
If you truly wanted data, you could so easily Google (as I did), and find the below sources that back up the comment you're responding to. There are myriad papers and sources.
But I think your comment doesn't seek insight so much as it seeks to discredit and dismiss... in, frankly, a pretty lazy attempt. If you're going to be dismissive, put some effort in, man! ;)
