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In an interview with People, McConaughey revealed that he called Hanks to get some advice about the dramatic transformation, telling the magazine that the two had "a great conversation ... about what he learned about losing weight for 'Philadelphia' and 'Cast Away.'"
McConaughey started at 185 pounds, and ended up shedding 50 pounds for the part, leading friends to worry about his health. The actor -- who said he consulted with a nutritionist about the safest way to lose such a huge amount of weight -- added that those shocked reactions were exactly what he wanted.
"I was going around and people were going, 'Hey, are you feeling all right?" McConaughey said of the time he reached his initial weight loss goal of 40 pounds. "But then I hit 135 pounds. I ran in to somebody and they didn't just ask if I was all right, they said, 'My God, we need to get you some help.' And I thought, 'There we go. That's the perfect spot.'"
The actor added that he wasn't immune to talk of the serious health risks associated with such significant weight fluctuation; in fact, medical experts say that Hanks's own willingness to shed then gain weight so often may have contributed to his recent diabetes diagnosis. But McConaughey told People that he took care of himself throughout the process.
"I fed myself good food, just not much of it," he said. "I found through this journey that the human body is much more resilient than we give it credit for."
You can see McConaughey's transformation for yourself when "Dallas Buyers Club" opens on November 1.