The Story Behind Matthew McConaughey's Dramatic Weight Loss

He seems to be shirtless more often than not , and he stripped down to a thong for his last movie,Magic Mike. So why is he suddenly dropping weight like crazy? Is everything okay in McConaugheyland? In a July interview with Larry King, the actor acknowledged his extreme weight loss -- and explained that he's doing it for a role. Watch the clip below."I’ve got a role coming up in the middle of September. I’ve lost about 15 pounds, I’ve gotta lose about 15 more," McConaughey, 42, told King while visiting his Ora TV webseries, Larry King Now.GM Diet"I should not look healthy by the time I'm doing this."Negative CalorieIn the film, The Dallas Buyers Club, McConaughey plays Ron Woodroof, a real-life Texas man who contracted HIV from drug use in the 1980s and began smuggling medicine from Mexico.The film has been a long time in the works, and now that it's being made, McConaughey has thrown himself into preparing for the part.