As the author Michael Pollan taught us in his book The Omnivore’s Dilemma, our food and the way we eat has changed more in the last fifty years than in the last five thousand. All these changes mean that we’re eating in a way that’s significantly different from our ancestors. High-fructose corn syrup, corn-fed factory-farmed meat, preservatives, genetically modified wheat, and hormone-injected dairy are all examples of foods that have never been consumed in the quantities and combinations that we’re consuming them in now.