The newest crazy diet fad: eating like a caveman. Dieters eat mostly meat, but also vegetables, fruits, nuts, and seeds. Fatty cuts of red meat are encouraged, while processed foods like sugar, dairy, grains, and beans are all off-limits. A typical Paleo meal includes grilled steak on a bed of uncooked spinach, for example, with a few blueberries for dessert. 

The movement is gaining momentum thanks to dedicated fans who swear by the diet’s steady intake of meat and veggies. Skeptics are wary, though, and research supporting so-called “evolutionary eating” is thin at best. Is this a passing fad or the diet of the future?