One cause could be emotional eating. People might overeat when they are stressed, sad or bored. Another cause can be a lack of portion control. If one constantly eats large amounts of food without considering the right portion sizes, it can lead to overeating and eventually a big belly.
One way is to check online comic book platforms. They might have digital or physical copies available for purchase. Also, keep an eye on official Fortnite merchandise websites for possible releases.