Kelly Osbourne and Kate Hudson is said to be the latest diet craze to sweep the US and GaGa seems to have jumped on board with her fellow A-listers.
A source told The Mirror: "All these sexy American women have been knocking it back."
They added: "It apparently contains a magical Japanese ingredient which curbs the appetite. GaGa is a convert. Her rider is just this Neuro stuff, teabags and fresh veg."