Drew Barrymore has been working hard! The Santa Clarita Diet star shared on her Instagram recently that to prepare for her role in the hit Netflix series, she lost 20 pounds by eating clean and working out — and we know exactly how she did it!

Kimberly Snyder, nutritionist and multi-time New York Times best-selling author of the Beauty Detox book series and Radical Beauty, personally helped Barrymore shed the weight and shared with On Air With Ryan Seacrest exclusively her clean eating tips and tricks that the actress follows.

“Drew, like most all of us, wanted to eat and live life! Not diet or feel restricted,” Snyder shared. “The key to eating abundantly and losing weight is whole foods and fiber. That is why Beauty Detox is about the Glowing Green Smoothie, filling soups, lots of salads and roasted or cooked veggies.”

Looking for a great Beauty Food? It is easy to forget about common fruit, pick up an apple today and enjoy! 🍎🍏🍎🍏

A post shared by Kimberly Snyder (@_kimberlysnyder) on

Snyder, who worked with Barrymore ahead of season 1 as well, added that Drew makes sure to not overeat animal protein. 

“People eat way too much protein,” Snyder said, explaining that “excessive protein is insulinogenic which means it behaves similarly to extra sugar in the body and can actually work against weight loss goals.”In short, “Drew does eat some animal protein," Snyder added, "but it is organic and small in portion size. She gets tons of micronutrients, and more than enough protein from her plant-based foods and meals.”

Drew, according to Snyder, starts each morning with hot water with lemon and takes Snyder’s SBO probiotics.

For lunch, the author added, “she might eat a bowl that includes lots of fiber and cooked and raw veggies with avocado and quinoa.” Dinner consists of “cooked veggies and vegtable soup or stew and sometimes a few ounces of fish or other animal protein.”

And don’t worry — snacks are allowed! 

Snyder shared that Drew’s go-to snacks include “veggies and sprouted hummus or Raw Red Pepper Muhammara, a Beauty Detox recipe.”

#becomingSheila more training. She is strong. Fierce. Wrong. And I love being her. She woke me up!

A post shared by Drew Barrymore (@drewbarrymore) on

“I always say progress not perfection,” Snyder concluded of her philopshy. “I certainly don’t think we need to be perfect, but I encourage striving for 80 percent [of the time.] Everyone goes off track sometimes and that is okay because it’s what we do long-term that really counts!”