As Amber grew fatter and fatter, space was quickly running out in the stomach. Realizing this, the fat began to migrate far and wide to find their own slice of paradise. A lot of the fat gypsys decided to migrate to Amber's forearm and hands but underestimated the journey.
As the first group of fat gypsy's reached the elbow, they tried to make the climb, which had disasterous results. Realizing they were fat cells, they took the lazy route and decided to set up operations in her upper arm, where they lived fatteningly ever after.