Grey’s Anatomy star Katherine Heigl looks to have lost a stone in the last year. She may be following a healthy eating plan, but she appears to have a secret weapon - she smokes constantly.

A few days ago, the beautiful blonde was spotted having lunch in Los Angeles. She ordered just a salad, but spent the meal chain-smoking. Nowadays she is rarely photographed without a cigarette in her mouth, and when she isn’t smoking, she is clutching a pack.

Marc David, nutritional psychologist and author of The Slow Down Diet says: “It’s a choice, really. You are choosing possible lung cancer and death over treating your body with respect, all in an effort to be slim.”