Why is the Blood Type Diet considered a fad diet?

Why is the Blood Type Diet considered a fad diet?

Andrea Giancoli (Registered Dietician ) gives expert video advice on: What is the overall analysis of the Blood Type Diet?; What are the biggest concerns about the Blood Type Diet?; Why is the Blood Type Diet considered a fad diet?

This is considered a fad diet because there's absolutely no scientific backing behind it. It makes promises that have no research behind them, and it's not something that people can really follow for a long period of time, depending on what prescription you are supposed to be following. For the type O's, which is most concerning, people get tired of eating meat.