From the Super Mario Wiki
Spaghetti is an item found in the Paper Mario series and is Mario's favorite food as said in The Super Mario Bros. Super Show! and officially by Nintendo. It is briefly mentioned in the opening of Hotel Mario and in Super Mario 64 (if Mario is left idle long enough and takes a nap). Tayce T. can make it with Dried Pasta, but Zess T. requires Fresh Pasta. It heals six HP and four FP, and also increases defense that turn by one if used in battle. The item's healing power is doubled when cooked with Dried Pasta but reduced when cooked with Fresh Pasta. In Super Paper Mario, it is replaced by the Spaghetti Plate.
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