Do Grape Trees Start as Nuts?

I have realized that no matter how much sugar or honey you put on Grapenuts cereal it still tastes very bland. You could sprinkle a light layer of Grapenuts on pure cane sugar eat it and it would still taste awful. Its weird though that only after a couple of bites you are full and you wont get hungry again for at least 5 hours. At least it is not taco bell where I feel nauseated for a week after eating it.