Mitch is correct in striving to limit the breads and pasta. or if we can clarify, the white breads and pasta; and too large a portion
white bread and pasta wouldnt be a massive contributor to nutritional intake and can easily be eaten in excess making portion control more challenging. you are correct in asking why not? if you can control your portion and not have them too often then bread and pasta are ok… they must be the 1/4 of the plate max, along with the veggies and protein and pasta and bread are rarely served this way.
but you can make greater improvements than just portion control…
Root vegetables are a lighter choice regarding carbohydrate grams and calories; they are super for minerals, some vitamins and fiber.
wholegrains like quinoa, millet, brown rice, buckwheat etc are nutritious and filling (fiber rich also). you can even shoot better with more antioxidant rich choices such as black rice, red rice, red quinoa etc.
pastas can be improved by choosing pastas made from beans, lentils, edamame, buckwheat, millet etc.
breads if you like them can also be improved for example rye, millet, buckwheat, sourdough etc. just be mindful to not make every meal a sandwich!
be smart in other words. some people are best just avoiding bread and pasta; this i have definitely seen. for some reason it seems to solidify better choices.