My personal guess is that there are multiple causes. Different people are affected differently by the same thing. If we have pervasive exposure to numerous things that have (unproven) theories behind them, it would be hard to identify any given one due to the noise and long duration (epigenetic especially) that might be required to manifest rhetoric end result.
There's so much we've learned over the past century, and yet it feels like know almost nothing when we try to dig into complicated life science topics.
There's so much we've learned over the past century, and yet it feels like know almost nothing when we try to dig into complicated life science topics.