If you look at ingredients on pasta sold in USA there are a bunch of vitamins (Folic acid, Niacin, Riboflavin, etc) added that you would never see in Italy. Italian law requires dried pasta must be made with only two components: Durum wheat semolina and water. And that's what I always buy.
They'll probably tinker with Fish and Chips next because some fat Brits are lacking something.
Everyone I’ve talked to says you feel much better after eating pasta in Italy. [That may also be due to the breeding we’ve done with wheat here]