I wonder if they were able to cleanly separate the genetic bias (which both mother and child would share) when it comes to eating.
I.e. does mommy's aggressive eating style during pregnancy instill an aggressive eating style in the child, or is it merely that mommy always had a suppressed (social pressures, body image, etc) aggressive dietary desire buried in her genetic sequences and once she became pregnant and the social pressures relaxed (queue OBGYN that says "eat it if you want it girlz!") then the eating bias was no longer supressed.
Then out pops kiddie, with similiar genetic pre-disposition to aggressive eating habits, and being a kid faces less social pressure to maintain a BMI below 40, and the same genetics that befell mommy dearest during pregnancy are suddenly manifest evident in child-wonder...