Cholesterol is the most abundant steroid and it is used as building blocks for cell membranes, maintaining healthy cells, as an aid to digestion and in the manufacture of sexual hormones. Cholesterol is soluble in fats, that is, it dissolves in fat. It is also a Lipid. Lipids do not dissolve in water, alcohol, ether, or other organic solvents. This is why cholesterol is also classified as a lipid.
Blood plasma is like water.
Blood cannot absorb cholesterol. Since cholesterol is soluble in fat molecules, it is transported throughout the body as a hitchhiker in fat molecules. This is the reason for the connection between cholesterol and fats in body metabolism. The end product of a number of bio-chemical reactions involving cholesterol in the body is a group of protein molecules referred to as lipoproteins. These are divided into two groups.