“But of mental illness, we’re a particularly long way from understanding the interplay among those factors.”

This line is very important to the overall argument because I think it really summarizes the overall content of the article that there is no conclusive evidence to what causes mental illness and it will take a long time before we can understand it. The article mentioned many experiments and their results, but there is still no definitive answers to the cause of mental illness.

According to the article the factors that causes mental illness are genetic, environmental, psychological and physiological factors. I think 4 different factors makes it very difficult to come up with a conclusion especially genetic. The genetic factors an experiment concluded that “Certain genes are turned on, or turned off, expressed or not expressed, depending on environmental inputs”. This would be impossible to get a conclusion as people would not know what genes are not expressed because they would not know that they had it in the first place.