The 38-year-old said that both she and her husband Michael Douglas were left baffled by the rumours of an eating disorder.
"Michael was laughing at me. He told me what [people had] said - that stories say I'm anorexic. Do I look anorexic? How could I ever, ever be anorexic?" People quoted her, as saying.
The actress, who joined her husband and their two children, Dylan, 7, and Carys, 4, at the Savannah College of Art and Design's 10th Annual Savannah Film Festival where Douglas was given a Lifetime Achievement Award for acting, said that basically its her eating habits that have changed a little.
"I looooove bread. But these days, I'm just working out and not chomping down what I usually chomp down," she said.
The Welsh beauty also expressed her shock over the amount of attention being placed on women's weight.
"There are many women [who are] maybe a little fragile, and it becomes a huge issue," she said.