Thanks for the clarification. The food pyramid is what i was missing. Now i understand what you're saying.
Some insight from someone else... i dont pay the food pyramid ANY attention. I also don't pay any attention to a "recommended portion size". Maybe its because i'm a little more knowledgeable about nutrition than an average couch potatoe. I think along the lines of grams of proteins, carbs, and fats, and modify macros to meet whatever goal i have at the time. So if i'm aiming to eat 300 grams of carbs, it doesnt matter to me what a "portion" of pasta is by usda definition. It matters to me how much pasta is 300 grams worth of carbs.
Just food for thought.