The Paleo diet seeks to eliminate food which are not a part of our ancestral heritage. This paper presents a good defense of that position (Loren Cordain, S Boyd Eaton, Anthony Sebastian, Neil Mann, Staffan Lindeberg, Bruce A Watkins, James H O’Keefe, Janette Brand-Miller; Origins and evolution of the Western diet: health implications for the 21st century. The American Journal of Clinical Nutrition, Volume 81, Issue 2, 1 February 2005, Pages 341–354). Here’s the foods that are “new” to our diets.
Eliminating these foods eliminates the diseases of modern civilization. Other than dairy and fruit this is consistent with the Low Carb diet.