It isn't boredom, I've come to realize. It is preference. When people think about eating eggs and they're in the throws of ketogenic anorexia, it sounds not so appealing. But, oh boy, that flavorless oatmeal they had every morning for 10 years sounds wonderful.

That's 10 years of Pavlovian conditioning against a few weeks of low carbing with ketogenic lack-of-appetite that makes eggs sounds not so good.