“Usually weight gain on antidepressants is more in the realm of 20-40 lbs”
^I respectfully disagree wholeheartedly with this as a definite conclusion. I am not on antidepressants at the moment but have been on a bunch (seriously, almost every single SSRI plus a few of the others) over the years and have never seen much impact on my weight. I have known literally dozens of people on antidepressants (due to making friends during multiple stints in psych treatment programs) and some have had weight fluctuations but none anywhere near 20-40 pounds. And for every person who maybe went up a few pounds after starting meds, there was one who lost a few.