Matthew McConaughey Weight Loss Shocks Fans

Actor is playing an electrician diagnosed with AIDS in "The Dallas Buyer's Club."
3:00 | 11/12/12

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Transcript for Matthew McConaughey Weight Loss Shocks Fans
Now, we want to get right to those astonishing photos of the dangerously thin matthew McCONAUGHEY. His stunning weight loss is for a role but some people say he may have taken getting into a character way too far. Reporter: They're the photos looking frail and ill. matthew McConaughey looking extremely gaunt. His cheeks sunken in. His clothes barely hanging on to his wire-thin frame. THANKFULLY, McCONAUGHEY'T Sick, he's undergone this radical transformation to play an electrician diagnosed with aids. I just can't do it myself. I haven't been this light since I was in the ninth grade. Reporter: He recently spoke with larry king about losing the weight. It takes a while for your body to understd it has to feed off itself and you're not going to give it something else from the outside. Reporter: The weight loss looking more jarring when you see him in "magic mike." I think I see a lot of law breakers out there. Reporter: It's a 360-degree turn for a hollywood hunk known for his physique touted by "people" magazine as sexiest man alive. Losing weight like this in that dramatic fashion, it messes with the way your kidneys and liver process the vitamins and nutrients. It's very dangerous. Reporter: But mcconaughey isn't the only actor to lose weight for a character. Tom hanks lost 50 pounds in the film "castaway." That was the second way after 1993's "philadelphia." And beyonce lost 20 pounds for her leading role in the film "dream girls." When you lose that much weight and put in the effort to do that you're much more likely to get noticed by your peers and that translates easily into awards and that's what actors love. AND YOU CAN see McConaughey next year. Shoppers especially important when they head into the holidays for the temptation

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

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