User blog comment:IamJakuhoRaikoben/Chapter 418: Challenger, Review./@comment-1359322-20150202160942/@comment-9595671-20150202174421

Despite how much she loves cake, I don't think Erza could sit still that long enough for her to gain so much wait. Plus the risk of cavities.

And we already had Droy gain like... 130 pounds already, I think doing something like that again wouldn't fit at all.