"I look at Gaga and I think, 'How does she do it?'" said John. "I talk to her mum and dad about it. They worry. She is frail, and she doesn't eat when she should do, and she's a girl, and it's tougher for a girl."
John also had concerns with Gaga's busy schedule and her arduous work rate, fearing the constant travel would wear on the petite pop star. "She works really hard. She will be in Denmark one night and Saudi Arabia the next," said John. "I know how tiny she is and I do worry about her, yes."
Elton John and Gaga have grown close over the years, with John naming Gaga the godmother of his one-year-old son Zachary Jackson. Late last month, John was hospitalized for a serious respiratory infection and was forced to cancel a week of shows, while Gaga was forced to cancel a show in Indonesia after being threatened with violent protests.