Kakashi is really starting to become confused. His diet has barely changed, but his weight is out of control. Normally he would have missions constantly, so he never has to worry about his weight too much, but Tsunade has had him in the village more often than not, rarely giving him a mission that lasts longer than a couple days.
His once trim and defined body has softened at a rate that seems almost impossible, but the evidence is clearly on display. His thin legs have ballooned, becoming jiggly marshmallows that test the limits of the stretch in his pants, the inner thighs going see-through. His arms follow suit, the sleeve of his shirt tight enough that they've begun to rip, exposing pale doughy skin that's unused to sunlight. His chest has expanded, becoming soft pointed moobs that rest on his belly. And his belly, seemingly most of the excess weight has collected there, becoming a squishy ball that rivals a yoga ball in size. Too large to be contained in any shirt of his, he's had to resort to a henge to conceal the fact that his shirts usually only function as a bra of sorts, holding his moobs up and accentuating their size.
He's been too stubborn to weigh himself, but he can't ignore it any longer. He steps on his bathroom scale, trying to look over his recently grown gut, buy can't seem to see the numbers, let alone his feet. He turns to the side, finally able to see the fact that he somehow has hit 300 pounds. His face, already pale, becomes sheet white. He had no clue that he had gotten so fat, so piggish, so lazy. The moments of laziness flash through his mind, highlighting just how much his behavior has changed.
The times where he would simply sit at home, preferring to not need the henge he used outside, and would just snack, the excess weight creating an awful appetite. The times where he and naruto would go to Ichiraku Ramen, and eat enough for four people each, the both of them acting like no one is around, letting out burps and acting like total pigs. The times where Tenzo would offer to treat him to dinner, and would only bring him to a buffet, seemingly aware of the fact that Kakashi eats enough for multiple people at every meal.
He needs to make a decision, to decide if he would try to take the weight off or accept the fact that his own lack of discipline has led him to this fat, piggish state.