To define the Paleolithic diet is impossible. Our early ancestors lived in different environments and their diets had to be food that was available in those varied environments. However, it is considered by Paleo enthusiasts to be protein-rich, with emphasis on grass-fed beef and fish rich in omega-3 fats. Carbohydrates should come from nonstarchy fresh fruits and vegetables. Since it is assumed that our predecessors did not have access to cereal grains, legumes, dairy, potatoes, or processed foods – they are not considered to be Paleo. The avoidance of processed food does contribute to this diet’s good points; however, however, it may be a bit restrictive (not so good).
The Paleo Diet is either a fad or a trend. Here is a very comprehensive article on all the aspects of the diet – its pros and its cons. No one diet is appropriate for all – the best diet is one that you feel comfortable with and can make it a part of your lifestyle.