[zare_st]

The body is a huge system. Causation is easy in easy cases, if you eat heavy metals you will get cancer, because we know enough of the radiation effect on cells to encircle these cases with systematic knowledge. This happened years and years after corellation was anecdotally detected and then statistically proven.

How many years we'll need to gather that knowledge for psychological diseases is beyond me. There are too many variables.

The research's findings are rather useless for the real world application. If someone was informed at early age they're in risk group, either by having history of illness in family or an episode, they're going to be advised to live a healthy life 100%.