DNA may or may not be one factor; gut flora may be another. The fact is that we now have proof that 2 mice can eat the same energy, burn the same energy and po

DNA may or may not be one factor; gut flora may be another. The fact is that we now have proof that 2 mice can eat the same energy, burn the same energy and poop the same energy, and yet 1 will become fat and the other won't. Say what you will about responsibility when it comes to obesity, you can no longer argue with authority that "calories in - exercised calories out = weight" due to this single counterevidence.