Luffy was an odd one, that was for sure, especially when he ate. Gorging himself on an overwhelming amount of food until he would Literally balloon up

This was no problem for him, of course, His body naturally squashed and stretched with no harm thanks to his Devil Fruit powers

Laat night wasn't anything out of the ordinary, Luffy inhaling pound after pound of cooked meats and rice, anything he could get his hands on until you had to roll him down to your shared Cabin. His Body would be back to normal in the morning anyways

However, when you woke up just a few minutes after he did, you found him standing in the mirror and staring at something (honestly.. something he's done quite a few times, but this time was different

It was only when you got up and came over to him asking what was wrong did he turn around, face blank and... with a little fat on his tummy

It was unusual, his body would automatically fix itself and go back into shape, but perhaps he had eaten too much for his Devil Fruit powers to handle?