High cholesterol levels can be attributed to a variety of factors. The most important ones for you to consider are listed below.
http://www.cholesterol.co.za/what_causes.htm
Encyclopedia section of medindia briefly explains about the causes of High Cholesterol.
http://www.medindia.net/patients/patientinfo/highcholesterol_causes.htm
High cholesterol and excessive body fat are detrimental to heart health. They are major causes of coronary heart disease.
http://www.cholesterolfocus.com/high-cholesterol/causes.php