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usually people when they start talking about cholesterol the first thing that comes to their mind is the bad part of the cholesterol, but let us talk about the good part of the cholesterol. cholesterol is: contains 27 carbons is white substance  part of the biological membranes (very important constituent of our cells).  can be used by adrenal cortex or gonads to makes steroids hormones such as corticosteriods hormones. also can be used to make bile acids, Vitamin D (which is a fat-soluble vitamin) cholesterol is also very important for the process of learning and memory. surely there are some areas of cholesterol metabolism and its function that make it bad substances. as we know cholesterol level rise in the blood some times and depending on the type of cholesterol may have dangerous consequences. diet that contains cholesterol can be absorb through the intestinal of epithelium, of course cholesterol is not absorbed in the form of free cholesterol, its usual...