[busyant]

I think you're ignoring a wealth of research just because it doesn't fit with your world-view.

There is a fair amount of evidence indicating both genetic and epigenetic contributions to obesity.

http://www.ncbi.nlm.nih.gov/pubmed/12574619

http://www.ncbi.nlm.nih.gov/pubmed?cmd=Search&db=pubmed&...

http://www.ncbi.nlm.nih.gov/pubmed?term=obesity%20epigenetic...

http://www.ncbi.nlm.nih.gov/pubmed?term=obesity%20genetics