OK, great, thanks for that.
The epigenetics explanation though, you've left out whether it changes genes themselves or just the expression of the genes. The google def said it doesn't affect genes themselves, only the expression. And I'm sure I've read some pretty detailed explanation of epigentics some time ago which said the same thing.
I'm not convinced they're not basically the same thing. Apart from diathesis stress talks about a particular kind of expression, an illness, eg depression.
Both are about external events affecting final gene expression. I think that's established. And if I'm right, which I'm pretty sure I am, both are about how the expression of genes gets modified, between the genes themselves and the final expression.
It's just that the daithesis stress version concentrates on depression and schizophrenia, whereas epigentics includes those things, but also many other things, including non-disease stuff.