English rock singer Sir Elton John is worried about the health of pop sensation Lady Gaga, who is also the godmother of his son Zachary. The noted singer-songwriter feels that Born This Way singer is overstretching herself and the non-stop schedule of her Born This Way Ball world tour will take its toll on her health, reported Contactmusic. "I look at Gaga and I think, 'How does she do it?' I talk to her mum and dad about it. They worry, John said. "She is frail, and she doesn't eat when she should do, and she's a girl, and it's tougher for a girl. She works really hard. She will be in Denmark one night and Saudi Arabia the next. I know how tiny she is and I do worry about her, yes," he said.