Jared Leto ''didn't eat'' to lose 30 pounds for a film role.

The 30 Seconds to Mars frontman dropped down to 116 pounds alongside his co-star Matthew Mcconaughey, who lost 38 pounds, to play a transsexual with AIDS in 'The Dallas Buyers Club', and admitted it left him feeling very fragile.

The 41-year-old rocker told EOnline.com: ''I got down to 116 or something. I just basically didn't eat. I ate very little.

''I had done similar things with weight, but this was different, I think the role demanded that commitment... It was about how does that effect how I walk, how I talked, who I am, how I feel. You know, you feel very fragile and delicate and unsafe.''

The singer and actor admitted some of his family and friends were shocked by his dramatic weight-loss, as they were not aware he was doing the movie.

He explained: ''It's not a great thing to see. If you run into people or see family who don't know what you're doing, they think that you're sick.''

Like Matthew, Jared has slowly been regaining weight since they finished filming the movie.

In January Matthew admitted he relieved to be almost back to his normal weight of 165 pounds because the extreme weight-loss had taken a toll on his health.

He said: ''Your organs [and] muscles shrink, your organs shrink [and] my stomach has shrunk as well.''

''I'm doing cardio but I'll tell you what, the more I've learned is - and I think it comes with age too - is it's 90 percent diet. It's a matter of how much I eat or how little I eat.''