"It is debatable that a diet, changed to reduce dietary fat and cholesterol, can lower blood cholesterol levels,‏⁴ (and thus reduce the likelihood of development of, among others, coronary artery disease leading to coronary heart disease), because any reduction to dietary cholesterol intake could be counteracted by the organs compensating to try and keep blood cholesterol levels constant."

http://en.wikipedia.org/wiki/Cholesterol#Dietary_sou...