Besides meat, our caveman forebears had easy access to fruit and vegetables, which means all varieties of fresh, in-season produce—from leafy greens to tubers to berries—are completely fair game. (Pro tip: If you go Paleo, you’ll probably want to get acquainted with your local farmer’s market—or join a CSA.)
On the flip side, though, Paleo experts think we modern humans rely far too heavily on high-carb legumes, like soy, peas, chickpeas, beans, and peanuts—so they’re all 100-percent nixed. “Legumes are off the diet for the same reasons as grains, minus the gluten component,” says Quinn. “They’re high in antinutrients like lectins and phytic acid."