Here is a link to the original report. The study mentioned was a survey of 50,000 in Australia. A German study of 4000 also showed more mental health issues. http://www.sbs.com.au/news/article/2...-unhappy-study

Here is a basic report of the research done. It appears the research was very broad and the anxiety/depression issue was not the focus. The complete data is not presented.
http://www.roymorgan.com/findings/52...s-201310272327

The link posted to tryptophan rich foods would do well to have a source to the values listed in the table.
Here is another list.
http://www.healthaliciousness.com/ar...phan-foods.php

Note, processed soy, especially fermented soy, is high in free glutamate that is a neurotoxin.