Aniston: Eating a Big Mac Made Me 'Feel Terrible'

Looks like Jennifer Aniston won't be hitting up a McDonald's drive-thru anytime soon.

In a candid interview with celebrity makeup artist Tina Turnbow for The Cut, Aniston reveals the time she had no choice but to eat McDonald's -- and the not so pleasant after effects on her "purified system."

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"I'll never forget when Justin and I were on a road trip and we were so hungry. The only thing around was McDonald's. I think I ordered a Big Mac," she explains. "Wow, my body did not react well to that! It was like putting gasoline in a purified system. I am always trying to eat organic and natural foods, so that just made my stomach turn and made me feel terrible. And I think what you put in your body, as well as stress, is reflected in the quality of your skin."

Speaking of her signature glowing skin, what's the Aveeno skincare spokeswoman's number one tip to achieve a complexion like hers?

"I can never stress enough to my friends that they must do as I do ... hydrate, hydrate, hydrate! Drink lots of water, get enough sleep, exercise, and eat a clean healthy diet, whenever possible."

Video: Jennifer Aniston's Tips for the Perfect Body

As for her skin care routine, it turns out to be surprisingly simple -- and affordable.

"The skin care rule I stand by is simply cleanse, tone, and moisturize. I also try to exfoliate pretty regularly," she reveals. "Awhile back I was doing a movie in the summer heat. Long days with a face full of makeup made my skin react badly. My makeup artist on set did a great thing, she gave me a tube of Aveeno Positively Radiant Daily Scrub to use every night. And I've been using it ever since."