Olivia Munn works out every morning to ''combat'' obsessive compulsive disorder (OCD).

The 'Deliver Us From Evil' actress finds the daily sessions with a personal trainer help ease the symptoms of the anxiety disorder - which sees sufferers experience obsessive thoughts and often indulge in repetitive behaviours - though she is unsure how they keep her calm.

She said: ''To combat my OCD, a trainer helps me work out every day 6 a.m. I don't know what he does, but it helps. We talked over the weekend.''

The 33-year-old actress also admitted she never brushes her hair and isn't faithful to using any particular product on it.

She said: ''I'm Chinese so I have thick hair, which I don't brush, and use different products. I love vintage shopping.''

And despite her slender frame, Olivia insists she never diets and is always happy to indulge in her favourite foods.

She said: ''I don't diet. I eat plenty. Lunch was chicken marsala, miso soup, spare ribs. I send up Korean and Indian room service.''

The actress will next be seen in supernatural thriller 'Deliver Us From Evil', which is based on a true story and she found it helpful having the person her character is based on on set with her.

She told the New York Post newspaper's Page Six column: ''The film's based on a true New York story. I play the real cop's supportive wife. They're now divorced. But she was on set with me and led me through how it all was.''