Re: Sorry for getting all unfunnybusiness...
If we're having an OT thread, I might as well point out that our bodies evolved to function on diets of meat and berries, maybe a few grass seeds, and to fend off famine on that diet while also constantly performing manual labor. Then grain comes along and before our bodies can really evolve to work with this, all of a sudden our food options get crazy like woah, there's tons of it, all sorts of weirdness that we weren't used to using as fuel, and most of our lifestyles no longer include manual labor.

Now, if you want your body to function more or less how it's built to, you have to try and replicate the effects of an entirely extinct way of life. A lot of people just want to live their lives normally, and realize that they don't have to outrun a sabertooth tiger anymore, even if their body still kinda thinks it should.