Terminator 3: RISE OF THE MACHINES star Kristanna Loken has her blood checked regularly so she knows exactly what to eat.

The sexy actress, who plays a vampire in new movie BLOODRAYNE, is the latest celebrity to adopt a strict diet, based on her blood.

She explains, "I work with a great nutritionist. He analyses a sample of your blood to figure out how your body metabolises food. Then he can determine which foods are best for you."