Oscar Buzz Grows for Matthew McConaughey in 'Dallas Buyers Club'

The star lost more than 40 pounds to undergo transformation into HIV patient for latest film.
2:31 | 10/30/13

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Transcript for Oscar Buzz Grows for Matthew McConaughey in 'Dallas Buyers Club'
matthew matthew McConaughey and his new movie "dallas buyers club." Reporter: Last time we saw matthew McConaughey on the big screen, he was stripped to the waist in "magic mike." Now, look at him. Oh, my goodness. The man with the most celebrated bronze pecs in hollywood, got so skinny, people thought he was sick. You lost how much? 47 pounds. No one's counting. No. I was. I got down on the weight and was like, done. Reporter: Did you drink beer? I drank wine. Reporter: Red wine? Absolutely. Reporter: There's less sugar in red wine than white. I was militant about it. I had a regimen, stuck to it and lost the weight. Reporter: And putting the weight back on? Trickier. More fun. Reporter: Pecs back? They're under there. What are you doing here? Reporter: Was the weight loss worth it? This is a role that has everyone, for the first time in his career, talking about an oscar. How does it feel? It feels phenomenal. I have to get nominated first. You've tested positive for hiv. Reporter: I'd eat my hat if he doesn't get the nod. In "dallas buyers club" McCONAUGHEY PLAYS RON WOODRUFF. You have 30 days left. The story is a guy who is a two-bit electrician who gets hiv in 1986, when it's a brand-new disease. Down in mexico. Reporter: A true story. Woodruff started smuggling antiviral drugs in the country, keeping himself and others alive, and challenging the government's hiv drug policy. He starts off as a -- he's an s.O.B., Man. He's a bastard. Talk about rough edges. Reporter: Unlike mcconaughey. These days, he's settled down with his brazilian model wife and three kids, all with him on location. The family travels with me, thankfully. Reporter: Go wherever you are? It's great to hear different accents and different colors. Yes, sir. Reporter: Mcconaughey didn't get his shirt off in this movie. But don't worry, everyone. He will again. He will, again. For "good morning america," nick watt, abc news, los angeles. The extended trailer looks wonderful. "Dallas buyers club" opens in select theaters on friday.

This transcript has been automatically generated and may not be 100% accurate.

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