Keys states there is overwhelming evidence that dietary cholesterol becomes blood cholesterol.
"It was Ancel Keys himself who first discredited this notion[avoid eating cholesterol to reduce accumulation in body]. Although in 1952 he stated that there was "overwhelming evidence" for the theory, he then found that no matter how much cholesterol he fed to the volunteers in his studies, the cholesterol levels in their blood remained unchanged. He found that "tremendous" dosages of cholesterol added t othe daily diet--up to 3,000 milligrams per day (a single large egg has just under 200 mg)--had only a "trivial" effect and by 1955, he had already decided that "this point requires no further consideration."
-Nina Teicholz - Big Fat Surprise - Page 23