Dietary cholesterol is found only in animal foods. Abundant in organ meats and egg yolks, cholesterol is also contained in meats and poultry. Vegetable oils and shortenings are cholesterol-free. Most of the cholesterol that is found in the blood is manufactured by the body, in the liver, at a rate of about 800 to 1,500 milligrams a day. By comparison, the average American consumes 300 to 450 milligrams daily in foods.
Cholesterol is carried by proteins in the body in the form of lipoproteins.
The recommended ratio is below 5 to 1. Cholesterol accumulation in the arteries due to excess saturated fats in the diet and lack of exercise leads to atherosclerosis. They make proteins. Genes are carried on the chromosomes. Trials may attempt to determine whether the finds of basic research are applicable to humans, or to confirm the results of epidemiological research.