Think about the story. Why does the narrator first eat the soul orb dust?

To ease the fear of remaining isolated and becoming a Shell
To regain strength to venture back to the settlement
To save the dust so that it can later be used to pay the Crone
To avoid losing the memories and feelings that the dust contains

The narrator first eats the soul orb dust to ease the fear of remaining isolated and becoming a Shell. The dust provides a sense of connection and comfort, helping to alleviate the feelings of loneliness and fear.