The 26-year-old has opted to go on a new diet to make sure she is in the best shape for the gruelling tour, reported Contactmusic.
"Gaga has decided to go on a major body blitz and cut out all gluten and wheat from her diet, which is very hard to do.
"She has given her people strict instruction to advice staff at venues and restaurants about her new diet because she is taking it very seriously. Her aim is to drop 10lb in a month," a source said.