Jennifer Aniston was feeling grumpy when she stopped exercising for her role Cake

Jennifer Aniston was feeling grumpy when she stopped exercising for her role Cake.

She tells, "It’s interesting when you stop exercising. It really was interesting how my serotonin levels went down. My stamina was shot. I was cranky. I was irritable. I’m usually really not any of those things. I found myself short. I was hungry like crazy.”

Aniston stopped exercising for two months for act as Claire Simmons in movie Cake and often without makeup.

Then she added, “You realize exercise is just so important to our soul,” she explained to Dr. Oz. “Not just being able to fit into skinny jeans, to your state of mind, your soul, all of that. I surrendered into it. I actually didn’t fight it. I didn’t think oh this is horrible. It was such a part of what I enjoyed about mining this character.”