James Duigan and Emilia Clarke

Emilia Clarke is thanking one man for improving her time in the kitchen—and the bathroom!

The Game of Thrones star posed for a picture with James Duigan, creator of the Clean and Lean diet. Duigan can count Clarke as one of his many celebrity fans, including Rosie Huntington-Whiteley, Hugh Grant, and Elle Macpherson.

“Allow me to introduce the key to my very happy kitchen,” Clarke captions the photo. “This book. And this dude what wrote it…”

And Clarke, who was named Esquire‘s Sexiest Woman Alive in 2015, doesn’t hold back on the diet’s benefits, adding the cheeky hashtag, “#fullofthingsthatmakeyouopoopandthingsthatmakeyougood.”

RELATED: Kit Harington: ‘I Do My Own Training’ to Play Jon Snow on Game of Thrones

The Clean and Lean diet is designed to put your body in “the perfect state,” according to the website, ” ‘clean’ of fattening toxins and ‘lean’ as a result of a nourishing diet and regular exercise.”

Duigan also created a fitness program, Bodyism, to go with the diet, with four studios and cafes across the world. At the locations in London, Capri, Turkey, and the Maldives, they offer classes in boxing, ballet and yoga.

Clarke previously had to switch up her diet for her role in 2015’s Terminator Genisys, increasing her protein intake as she pumped up her workouts and cutting out sugar, though she said that was tough to handle.

RELATED: Kerry Washington Cooked a Game of Thrones Feast For Her Mom — Now Make Her Menu at Home

“It was really fun to do different kinds of training than what I would do myself and feel strong,” Clarke told PEOPLE. But “[when you finish], you’re like, ‘Please, can I have cake? Like, a chocolate cake, and a beer?’ ”

–Julie Mazziotta