What the hell was the "paleo" fad?
It's an exceptionally stupid fad diet called the Paleo Diet. Basically, some idiots picked an arbitrary point in the history of human evolution and decided that the way they imagined people ate back then is the way we are "meant" to eat. The diet itself is perfectly healthy -- your standard low carb, high in fruit and veg, no processed foods, no refined sugars and grains diet. But the reasoning, if one can call it that, is solidly idiotic, and its proponents are very preachy. Preachy and stupid.