Although Pirates of the Caribbean: Dead Man's Chest actress Keira Knightley's grandmother and great-grandmother suffered from anorexia, the ultra-thin young woman insists she does not suffer from the same disease. When she showed up at the London premiere of the new Pirates of the Caribbean movie in a low-cut, backless bronze Gucci dress, she was confronted with questions about her health regarding her waif-like appearance.

Knightley assured the reporters that she is fully-aware of the signs and dangers of anorexia because of her family history with the disease and that she does not have an eating disorder. She would certainly not be the first Hollywood actress to come under suspicion for anorexia, as it seems a current trend to be as thin as possible these days. But anorexia is not simply a matter of being underweight, it is a disease that can kill.

According to the Mayo Clinic, heart disease is the most common medical cause of death in people with severe anorexia. Anorexia can cause irregular heart rhythms; smaller heart muscles because the heart muscles lose size during starvation; drop in blood pressure and an imbalance of minerals essential to good heart health.