Actress Hayden Panettiere works hard to maintain her size.

The Heroes actress admits her slender size 4 frame is not natural, and she finds it a “nightmare” having to constantly battle with her food cravings.

“Sometimes I give in to my cravings, but if you’re a size 4, you have to watch what you eat most of the time. It’s a nightmare!”

The 20-year-old beauty - who has previously fronted advertising campaigns for skincare brand Neutrogena and clothing chain Candies - admits all her favourite foods contain carbohydrates, so she tries to restrict her intake to prevent herself from gaining more weight: “I’ve got this voice in my head saying, ‘Carbs, carbs, carbs! Pizza and pasta are best!’ and I’m always fighting to turn it off.”

Despite her weight battles, Hayden has previously confessed that she loves to wander around her house in the nude and doesn’t mind if her roommate sees her naked. “She sees me buck-naked all the time. She walks in and I’m like, ‘Look, I’m naked! Naked girl!’ ”