Matthew McConaughey talks shocking weight loss

Matthew McConaughey's stunning weight loss for his upcoming role as an HIV-positive man has caused quite the stir, and now, the actor is opening up about his shockingly skinny frame.

Weighing only 143 pounds, the formerly chiseled 6-foot tall actor insists he feels "fine" in a new interview with The Daily Beast.

"I got the means to lose the weight in a really healthy way - I'm eating fresh fish. I'm just eating small amounts. I'm not being starved," McConaughey said. "I'm sleeping well. I've got clean meals that I'm cooking for myself."

The actor and father of two said prepping for his role in "The Dallas Buyer's Club" is "an exercise in discipline."

"If anything, it's as much a spiritual journey as it is physical," he said. "My body is fine. I'm taking care of myself. Everything has shrunk quite a bit. It's really been enlightening to understand my anatomy. I don't have the leverage I used to. I have body soreness."