Jennifer Aniston tried a McDonald's Big Mac and hated it. 

Aniston shared her bad experience with a McDonald's Big Mac to New York Magazine. While on a trip with fiancé, Justin Theroux, Aniston was forced to make a tough decision.  

"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," the actress told the magazine. 

The famously fit actress is known for sticking to a strict diet to maintain in shape, which includes organic foods and doing yoga, so her fall off the healthy wagon did not go well. 

"Wow, my body did not react well to that. It was like putting gasoline into a purified system," she said. "I always try to get organic and natural foods, so that just made my stomach turn."

Not only is the actress carefully about what she puts in, Aniston is also forced one keeping her skin flawless.  

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