A couple of things could be said about this -- and might need to be.
The latest brain research on people with obesity indicates that the part of the brain that says, in effect, "that's enough" -- satiation -- is missing or not working properly in those suffering from obesity due to over-eating.
Secondly, I think if you do a more in-depth review of the literature you'll be more guarded in your support of "the self-medication response" to social adversity -- it's a lot more complicated than what you've outlined. Check out a special issue of the journal Addiction -- Volume 108, issue 4.
But, please don't be offended by the above comments -- I e"njoyed reading your response to the topic, just not the over-generalisation "the answer is always ..."
but better what you've written than the over-generalisations of the medical community 