One possible reason could be overeating. He might have been eating too much of the delicious food available in his kingdom.
Lack of exercise is likely a reason. If he was just sitting on his throne all day and not being active, it would contribute to weight gain. Also, maybe there were too many feasts and celebrations where he ate a lot without any self - control.
Well, it could be that the food in his kingdom became more and more indulgent. With rich and calorie - dense meals constantly available, King Dedede simply couldn't resist. Additionally, he may not have had any kind of dietary plan or restrictions. And without any physical activity to burn off the calories, like hunting or jousting which he might have given up, the weight just piled on.
Chapter 119, "Wen Jiaojiao is Poisoned!", is the clearest early answer because it turns Princess Wen's situation into a concrete plot event. The setup is What is Princess Wen talking about?, but the pressure keeps building through I can't understand a word?] [Is this some new meme?] [!!!.
Chapter 379, "Is This the Way Huaxiu Treats Its Guests?", is the clearest early answer because it turns Is's situation into a concrete plot event.
Chapter 183, "Sacrifice Oneself, Break Them Up!", is the clearest early answer because it turns President Shang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Seeing that he held a blue ball identical to Su Yinwan's, Jiang Yan...
Chapter 109, "Not One Deserves to Stay on His Friends List!", is the clearest early answer because it turns Zhao Daniu's situation into a concrete plot event.
Chapter 234, "Chasing Wind Youth", is the clearest early answer because it turns Good's situation into a concrete plot event. The chapter turns that into something concrete by moving from Given the vast mystical powers Jiang Li had displayed before, he was...
Chapter 480, "I'm the Guest, Give Me 500 Points", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Team H delivered the seafood feast as promised. and closes on There was a small pond with spring water nearby and an impressively....
Chapter 266, "He Really Deserves to Die!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Upon hearing this, the deputy director's expression also turned...
Chapter 112, "The Strange "Team Spirit" Appears", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with These five people are supposed to be at odds.
Chapter 19, "I dare you to touch her!", is the clearest early answer because it turns Shang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with What criminal law is this or that, this was originally none of your...
Chapter 335, "Songyang Ridge, Seven Houses Surrender, First Batch of Silver Arrives", is the clearest early answer because it pushes Nie Zichuan into a new phase or setting. The chapter turns that into something concrete by moving from The name "Songyang Ridge" was not given by Xu Ning; he discovered... to Ji Yang from Wanlong, representing the Six Families of Songyang....