Scar had been right after all: once Nala got past how much she thought she could eat, there were no limitations on how fat she could get.

Hooked up to the metal snake and constantly being stuffed more-than-full, Nala soon lost herself. She could feel, dimly, that she was growing, and derived some pleasure from that feeling, but she was more concerned with consuming as much as possible, as fast as possible. As a result, she grew fast. Soon, much of her limbs and tail became completely buried under her flab, turning her into a single shapeless ball of fat. Her massive stomach creaked and groaned constantly as it was forced to accommodate an ever-increasing flow of food, and if you watched her--as her scientist feeders did--you would swear you could see her growing.