December 17, 2014 10:36 AM

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Fat that can make you thin? Hollywood seems to be buying it.

“I start almost every day with something called Bulletproof Coffee,” Divergent star Shailene Woodley has said of the high-fat breakfast concoction that combines special low-mold coffee beans, grass-fed, unsalted butter and so-called Brain Octane Oil, which is a coconut oil extract. (Brandon Routh and Ed Sheeran are reportedly also fans.)

It sounds more like an indulgent dessert — but according to Dave Asprey, author of the new book The Bulletproof Diet, the high-fat content in his Bulletproof Coffee recipe is his secret ingredient to weight loss and increased energy.

RELATED: PHOTO: Chris Pratt and His Caveman Coffee

“You will have no interest in food for four to six hours,” Asprey tells PEOPLE of drinking only this cup of Joe to start the day. “It makes your brain work better because you are not distracted every time you see a cookie lying around. You don’t even think about food.”

When it comes to lunch and dinner, the rest of Asprey’s diet plan is just as fat-focused. That means filling up on lots of fats — like ones found in butter and guacamole — plus veggies and grass-fed proteins (which he says have more nutrients and fewer toxins than grain-fed meats).

“When you teach your body that it’s going to use fat for fuel, it helps you go into fat-burning mode, called ketosis,” says Asprey, who claims that his comes without the suffering many feel on other low-carb diets that can take days to get the body into fat-burning mode. “By using the extract of coconut oil in the coffee, it’s kind of cheating. It puts your body into the state where it get energy from fat right away.”

While he recommends taking gluten off the menu, Asprey says, “You can have carbs [think rice or sweet potatoes], but you have them at the right time, so that they help your sleep, instead of giving you food cravings all day long.”

Sounds like something we’ll have to try after the holiday season.

RELATED: Amanda Seyfried’s Diet Philosophy: ‘If I Want To Eat It, I’m Going To Eat It’

—Barbara Kimberly Seigel

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