The paleo diet mimics how our hunter-and-gatherer ancestors ate during the Paleolithic era. It avoids grains but allows high-carb foods, such as sweet potatoes and carrots, that the keto diet eschews. Another differentiator is that traditional Paleo diets don’t allow dairy whereas full-fat milk products are a part of a keto diet. However, some Paleo diets allow ghee and other dairy products.