Some of you may remember the fake food hypothesis that relates the obesity epidemic to the introduction of highly processed industrial food. JCI now has a nice review on the satiation signal and the complex system that may be disturbed.
Microbe content might also be important in this context click | click | click, however, even the adoptive transfer might be a secondary effect – everything in biochemistry follows mass equilibrium constants. The poorer resorption in the lean may lead to a different colonialization and vice versa. Will the adoptive transfer really show lasting effects longer than 2 weeks (in the mouse study)? Isn´t colonialization not influenced by diet (in the human study)?

Yea, yea.