With reporting by Josh Horowitz

How did the cast of "The Divergent Series: Insurgent" stay healthy on the set of the dystopian drama? Two words: Shailene Woodley.

Shailene is known for being deeply committed to healthy, natural living (the jury is still out on whether she's actually a wood sprite in human form), and she's always more than happy to share her latest finds with her fellow actors -- and with anyone else who asks.

"Bone broth. I am telling you, it is the s--t. It is everything," Woodley gushed to MTV News when asked about her latest health kick. (For those not in the know, bone broth is the hot new thing when it comes to utilizing the parts of an animal that normally get wasted. It's exactly what it sounds like.)

Co-star Jai Courtney confirmed: "She's been on the bone broth for awhile, baby."

But while Shailene might have fueled her stuntwork and action scenes on "Insurgent" with bone broth, some of her co-stars were skeptical. Courtney freely admits that he doesn't even try to keep up with Shailene, health-wise; and Octavia Spencer would eat it, hypothetically, but she'd also rather not know what she was eating.

Meanwhile, Ansel Elgort, who plays Shailene's brother onscreen, was only willing to concede that he likes bone marrow, which seems like just the sort of sneaky not-quite-agreement that an Erudite would make.

However, Ansel has been open to other health tips from Shailene, including one smart suggestion that he's really trying to make good on:

"Shailene says that I should stop eating four different types of meat in one meal," he said. "That's a very reasonable tip, so I have a salad once a day, if I can."

If I can, he says. Ansel Elgort! So sneaky!

To hear more about Shailene's efforts to improve the health of the "Insurgent" cast, check out the full video above! "The Divergent Series: Insurgent" hits theaters March 20.