It doesn't seem as though many people eat pasta or bread on plant-based. Is there a particular reason for this?

I do use pasta and bread in some recipes, in my cookbooks and in the meal plans but strongly suggest using either whole wheat, gluten-free or brown rice options since white pasta and white flour are not healthy. A whole foods diet focuses on whole, unprocessed foods and even whole-wheat breads and pasta are to some extent processed, so they are not as great as brown rice, oatmeal and other grains that are still whole, but my belief is they are fine as part of the accent to a diet, but should not be the bulk of the diet -- the bulk of the diet should be whole, unprocessed foods like grains, legumes, fruits and vegetables