Pacmans are like leopard geckos. Due to excessive inbreeding, hybriding, selective breeding processes, their immunities to certain stuff that they can normally tolerate i the wild is greatly diminished. Think of it as a well-cared for and overprotected child vs. a kid who grew up in the slums. Their tummy tolerance are very different. Then again naturally speaking, an animal's stomach has a very elastic wall lining to protect itself from its own gastric juices along with rough parts that most prey items possess. Myth or not, giving any animal a treat once a day or every other day is not a treat. It's called spoiling and additional varied diet. A treat should be given once a week or twice a month
