I think they blame their obesity on medical conditions because it would otherwise mean they over-eat, which would have been a big no-no back in ancient times. Imagine living in a small caveman tribe and 1 guy is constantly eating all the food. Of course he's a problem and needs to be killed. So fat people have become accustomed to blaming their obesity on other reasons to avoid being killed for being greedy assholes. They have literally evolved over time to lie about their over-eating to protect themselves while throwing others under the bus by eating their portions. &quot;Muh genetics&quot; is a lie as old as time