The Paleo diet is a low carbohydrate diet that eliminates the consumption of hydrogenated fats, grains, dairy, sugar, and trans fats. They also do not allow dairy foods. Followers of this particular diet believe that trans fats are the devil because they increase the bad for your cholesterol. Which is LDL, and as a result, people who eat that way tend to disregard healthy fats, which is HDL, and so they become in danger of developing diseases?
The Primal diet, on the other hand, follows the concept of grown crops being a no-no, and they also prohibit dairy foodstuffs. This diet does not permit for the consumption of cereals, grains, processed foods, and sugars. However, unlike the Paleo diet, the Primal diet does not restrict healthy dairy foods. The Primal diet is more of a holistic approach, while the Paleo is more of an actual diet.