In the Infinite Tsukuyomi, Chōji was in heaven. Food everywhere. All the food he could ever want and more. All of them were prepared by his girlfriend, Ami Yoshimaru, a brown-haired girl from Konohagakure who (much to the shock of Ino and Shikamaru) had a thing for gluttons. And in her eyes, Chōji was the biggest glutton she had ever met. So of course, whenever he was away on a mission, Ami would always prepare a feast fit for the Hokage whenever he got back. The only problem was, Chōji didn't sometimes know when to stop, leaving nothing for her. But she would always laugh, pat his head and just prepare more food for herself. Chōji was happy.
(!)
In the real world, Chōji was cocooned and tied to the Shinju along with his teammates, his family and his friends. In a matter of years, he would undergo a transformation just like the rest of them. One that would change him from being a big-boned, ever happy and food loving ninja into an obedient soldier for Mistress Kaguya. And he won't have to worry about being called fat anymore because everyone will look exactly the same.
(!)
In a year, Chōji's clothes evaporated, leaving him completely naked. He would not need them.
(!)
A year later, Chōji's chakra slowly began to become drained and the signs were showing. He already losing the amount of fat in his body, his skin was turning pale and his brown hair lost its color. And that was not all. His jutsus were being drained as well. In a matter of months, he would not be able to perform any of the Akimichi jutsus anymore such as the Meat Bullet Tank and Expansion Justsu. But he would not need them for when the change was complete.
(!)
Chōji became incredibly thin after another year passed. Now that his entire chakra was drained, his personality slowly began to be rewritten. He no longer cared if people called him fat anymore. And soon he would no longer care about food anymore. He no longer cared about being a shinobi anymore. All he cared about was serving Princess Kaguya. He was a soldier in development. A soldier was not meant to be fat. A soldier was meant to be fit and obedient. And he will become those things.
(!)
Another year passed. What was left of Chōji was now a husk of a man. He was now a dried up mummy, but he was still alive. He was preserved so that his body can now begin the next phase of the transformation. The first part was to restore the body's muscles. Very slowly, they regrew until the body now had the build of a well-built soldier.
(!)
A year later, Chōji's hair color had completely changed from brown to a sickly green color, his black eyes turned yellow and his skin turned chalk white. He was almost ready.
(!)
Another year passed. The cocoon containing Chōji Akimichi unraveled itself and let loose not Chōji, but White Zetsu, one of millions, and all of them loyal to Princess Kaguya. Beside him were his teammates. Once, they were Ino and Shikamaru, but they were White Zetsu just like him. If there was any trace of Chōji left, he would be happy. People were not going to call him fat anymore because everyone was now the same. And they all had one goal: protect Princess Kaguya and her world.