Teen pop star, Nick Jonas of the Jonas Brothers has been diagnoised with diabetes since 2005 at the age of 13. What really triggered his family to get him tested were his violent mood swings..

more photos after the jump… 

Nick’s mum Denise explains, “Nick was an especially wonderful child. So when he started acting with a bad attitude, I knew something was wrong.”

Besides, violent mood swings, Nick also revealed another side effect of his illness – food cravings.