Wow, great informative comment.  I was actually inspired by OP's post and the Idiocracy reference from a commenter below to make a separate post on how I think fats are evolutionarily destined to fail, and will not be able to sustain their current numbers.  I argue that while modern technology / medicine is a stop-gap to keep fats going, it ultimately will not be able to keep up with nature's ability find evolutionary innovations which prey upon the weak.  However, with modern medicine, we are able to get these hams pregnant with fertility treatments, and keep them "healthy" during their pregnancies with drugs for high blood pressure, gestational diabetes, etc.  I had no idea this kind of shit was already going on.  I ranted in my post about how fats will probably become increasingly infertile, but I had no idea we were already engaged in this shit, and that there is such a thing as "gestational diabetes" and so on.