You have likely been warned about type-2 diabetes, high cholesterol and heart disease as some of the conditions caused by obesity. Include a fatty liver!

Non-alcoholic fatty liver disease is the most common severe liver disease from which Americans suffer, and is the most prevalent liver disease among children. An estimated 1.6 million children are affected, according to Children's Memorial Hospital's Web site. But, most of them probably don't realize they are ill.

Fatty liver is "typically associated with abnormal depositing of fat in liver cells," said Dr.