Nick Jonas is winning his ongoing battle with diabetes. The brothers performed at a fundraiser for Children's Hospital Los Angeles on Sunday and chatted with ET! Nick, 'I've been in some of the best health I've ever been in. I think when...

..you're doing something that's obviously very close to your heart there is a special connection with it and some of the song's we'll be singing tonight brings us back to moments where diabetes played a role in the songwriting.'