Remeron can produce weight gain, but check with your pdoc, Zoloft does that in some people too.
Seroquel, I am not sure about, I have never taken that one, but I think you should ask your pdoc about this and see if there are any alternative meds, cause we know weight gain does not do anything for our depression.
I wish you lots of luck with this

DE
In giving advice seek to help, not please your friend
SOLON