There are a lot of different foods which are absolutely prohibited on the Paleo diet, including butter. Dairy products of all kinds are banned on this diet because most of them contain a high amount of saturated fat. Those who follow this diet will definitely want to make sure that they follow the guidelines that are laid out in order to achieve the desired results as soon as possible.
Some of the other foods that are now allowed on this particular diet include low-fat milk, cheese, cream, frozen yogurt, skim milk, whole milk, and powdered milk. Since this diet encourages people to cut down on the amount of fat they put into their bodies, it stands to reason that dairy products of all kinds, including butter, would be on the list.