Bear Grylls reveals why A-list stars willingly eat snakes, brave glaciers on 'Running Wild'

Joining host Brian Kilmeade, Grylls discussed the ninth season of his hit show, "Running Wild," which makes its debut on FOX.

While most talk shows involve celebrities sitting on a sofa to promote their latest project, the approach by Grylls is a bit more visceral.

Kilmeade joked about Grylls' casual appearance. But the survivalist was quick to note that his mother often called him the scruffiest person in the room.

For Grylls, however, the attire is a uniform for a job that bridges the gap between A-list glamour and rugged human experience.

"The wild never judges," Grylls said on "Fox & Friends."

When asked why some of the most successful people on Earth would willingly subject themselves to the harsh conditions seen in the show's promos - such as eating snakes or boiling water to avoid illness - Grylls said, for these stars, the appeal is about authenticity.

"It's different [from] a chat show, where you sit on the sofa, and there's a performance for three minutes to tell a funny story," Grylls said. 

The duo reviewed a clip of McConaughey learning the hard way that even "pristine" Norwegian water needs to be boiled to avoid a mid-journey disaster.

Reflecting on nine seasons of taking world leaders and icons into the brush, Grylls shared his biggest takeaway.

"Everyone's just a regular person underneath it all," he said. "I admire the fact that they're out of their comfort zone. And that becomes a discipline. Successful people do the difficult."