1 Cacao nibs contain all of the fiber, fat, and nutrients that the cacao bean does. 2  Cacao paste comes from cacao nibs that have been slowly heated to preserve the nutrients and are melted into a bark known that is a less-processed form of dark chocolate bars. Cacao nibs contain all of the fiber, fat, and nutrients that the cacao bean does. 2  Cacao paste comes from cacao nibs that have been slowly heated to preserve the nutrients and are melted into a bark known that is a less-processed form of dark chocolate bars.