Is it really healthy to try to eat like a cave man? Won’t you be deficient in many nutrients if you do not make grains and legumes the basis of your diet? Take a look at Professor Loren Cordain’s work that proposes a Paleolithic diet composed of modern foods.
As a fun experiment, use some nutritional software and start deleting veggies, fruit and lean meats and start adding bread, rice pasta and beans. Look at what happens to the nutritional quality of your diet with the addition of these foods.