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Cholesterol
The Bad & The Good: Cholesterol's reputation as a bad character actually originates in the crowd it runs with: the lipoproteins, protein molecules to which it binds in order to travel back and forth through the bloodstream to the liver, where it is manufactured. Not really a nasty round glob of fat at all, cholesterol is a crystalline substance, technically a steroid, but soluble in fats rather than water, thus classified as a lipid, as fats are. Thousands of cholesterol molecules bind with lipoproteins, spherical fat molecules that transport them through the bloodstream. Three different kinds of lipoproteins participate in this necessary process, not always with the same salutary effect.
Ask the Expert about Cholesterol
