A follower of the “paleo” diet—the trendy faux–Stone Age regime of meats, nuts, veggies, and fruits that excludes grains and dairy—who falls off the wagon (or falls out of the Flintstonemobile, perhaps). 

In a sentence:  “I’ve been eating nothing but rare steak and almonds for weeks. Then I get one whiff of my grandma’s lasagna and I’m a total faleo.”

Related:  Glute-ons—people who claim to be “gluten free” until you offer to buy them a cold beer or a warm scone.