The 47-year-old Oscar winner transformed his appearance to play gold prospector Kenny Wells, adding 47 lbs. to his typically athletic frame.

McConaughey famously lost 38 lbs. for ‘Dallas Buyers Club,’ but ‘Gold’ marked the first time he'd ever gained weight for a role without adding muscle mass. "I haven't ever done that. I said, 'McConaughey, you have six months to say yes to whatever you want to eat and whatever you want to drink. Whenever.' That was fun," he says. "The only thing that gets tiring is the thought of quitting. It was fortunate that I was like, 'Oh, this is also my job, so let's go—all green lights.'"

Surprisingly, packing on the pounds was much easier than he'd anticipated.

"My favorite food is cheeseburgers, so I was eating cheeseburgers all the time. I was making cheeseburgers. I was trying out all these fast food restaurants that I've never had, or I've only had one time," he explains. "Not that much sweets. Cheeseburgers and beer will do the trick."

In addition to eating "whatever I wanted," McConaughey stopped working out altogether. "I wouldn't even take the stairs to the second floor," he says. "That would be too much exercise."

McConaughey's three children with wife Camila Alves "loved" their dad's gluttonous phase. "I was Captain Fun—that was my nickname around the house, because I was saying 'yes' to everything. I was a really fun dad for that six months because I was like, 'No, pizza night's not just Friday night—it's Tuesday night; it's Wednesday morning.'"

(Source: E! News)

Matthew McConaughey, Gold

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