Miley Cyrus` lean times

Updated: May 21, 2012, 10:35 AM IST

Los Angeles: Miley Cyrus` friends think that she has taken her strict diet and exercise regime too far.

The 19-year-old has lost a lot of weight in the past few months.

Cyrus has been hitting the gym hard, sometimes attending two pilates classes a day. She`s only been eating a measly 1,000 calories a day, reports

"Miley was getting really frustrated with the lack of film roles. So she`s on a serious mission to shape up, so she can boost her career," said a source.