by 
The Curious Bag
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Found in nearly all parts of the human body, cholesterol is a waxy substance that comes from the food we eat and from within the body.
What Cholesterol Does
Cholesterol moves through the bloodstream and helps the body function, aiding in the production of vitamin D, bile acid and hormones.
Good Cholesterol
High-density lipoprotein cholesterol (HDL-C) is what is sometimes referred to as "good cholesterol." HDL-C helps carry excess "bad cholesterol" to the liver so it can be eliminated.
Bad Cholesterol
Low-density lipoprotein cholesterol (LDL-C) is referred to as "bad cholesterol." LDL-C has a danger of creating a build-up on artery walls, which can negatively affect the brain and the heart.
Origins
In addition to cholesterol that is genetically "inherited," it can come from dairy, eggs, poultry and meat. Meats that come from organs (such as liver and kidneys) are especially rich in cholesterol.
Prevention/Solution
A low-fat, high-fiber diet--combined with plenty of exercise--is the best solution for keeping bad cholesterol levels down. Since cholesterol problems often start in childhood, it's ideal for kids to follow this plan as well.
Source:
New York Times: Health Guide: Cholesterol
University of Iowa: Cholesterol is necessary for the body to function properly
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