Exactly what is the hypothesis that you’re testing? That gut flora affect metabolism and, as a consequence, a variety of things including weight? Sure, I agree. I suspect most everyone will agree.
But that’s a far cry from being the “best hypothesis” as to why some people easily gain weight and some do not.
Fecal transplants provide a way of testing the gut flora hypothesis.
Exactly what is the hypothesis that you’re testing? That gut flora affect metabolism and, as a consequence, a variety of things including weight? Sure, I agree. I suspect most everyone will agree.
But that’s a far cry from being the “best hypothesis” as to why some people easily gain weight and some do not.