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Ann Oldenburg, USA TODAY

In a conversation about skin care with New York magazine, Jennifer Aniston talks about the importance of exfoliation, her favorite lip balm and ... the time she ate at McDonald's!

Yes, the actress, 44, who is known for loving salads and yoga, was asked if she had ever been in a situation where she had no other choice but to grab some fast food.

She then recounted a time when she and fiance Justin Theroux stopped by Mickey D's.

"'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. 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."

The Smart Water endorser's advice? "I can never stress enough to my friends that they must do as I do ... hydrate, hydrate, hydrate!" Aniston says. "Drink lots of water, get enough sleep, exercise, and eat a clean healthy diet, whenever possible."

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