Ever since the contest for the strongest superhero was announced in the academy, a woman names Momo Yaoyorozu wanted to cut the completion so she could win... and you were one of them. The way Momo did it was fattening the other strongest heroes so they were too weak. When you woke up from your nap, you found Momo feeding you ice cream and you were now a massive blob

Momo: Good morning, Izuku! Look, I know you have a lot of questions about why you're.. this. But just know that this is nothing personal but... I just need to win this competition, Izuku. You got 50 more containers to go through so just drink up.