What's up with Matthew McConaughey??

After playing a muscular male stripper in Magic Mike, Matthew McConaugheyhas lost almost 40 pounds, a fourth of his body weight, to play AIDS patientRon Woodroff in upcoming film The Dallas Buyers Club.

During the Nov. 20 episode of Good Morning America, Matthew revealed the details of his weight loss and the struggles he’ll face ahead.“Overall, I probably got 35% less energy [now],” Matthew said in an interview wit HitFix that appeared on GMA. Making light of the situation, though, Matthew continued by discussing the struggles he faces.

He said, “I don’t want to be doing this interview at a pizza hut buffet. I choose to pick my places with less good smell.”Matthew went from 181 pounds down to 143 pounds, losing a fourth of his body mass. Standing at 6-feet, Matthew appears gaunt and unhealthy.“It’s 90 percent diet. Right now, I’m not losing any more weight if I burn 1500 calories, two hours of cardio in an afternoon, or I don’t,” he added.

While Matthew will likely receive Oscar buzz for his transformative performance, he will surely face struggles gaining the weight back.“The stomach has shrunk as well. As much as I can’t wait to have that cheeseburger on the day, it’ll probably be damn hard to eat the whole thing,” Matthew said.