Bad cholesterol
Most of the cholesterol in your blood stream will be in LDL
particles, or low density lipoprotein particles.
LDL, or 'bad' cholesterol carries the cholesterol to
the tissues in your body. Cholesterol needs to be taken to the
cells in your body and the LDL particles carry it there, where
it enters the cell membrane. The LDL actually 'dissolves' once
it's inside your cells and that's how the cholesterol is
actually deposited within the cells themselves.
Since your cells need some cholesterol to function, why then
is LDL called 'bad'?
The problem isn't with LDL particles as such, but with an
excess of cholesterol in the bloodstream. If you have too much
cholesterol then LDL levels are high and instead of being taken
up and used by your body's cells, some of the exess can 'leak'
through the arteries.
In turn that can start the process that leads to plaque
build-up and eventually arterial disease.
With increasing LDL to HDL ratio comes a higher risk of CHD
(coronary heart disease). When you have a blood cholesterol
test you'll usually get a total overall number, but the ratio
between LDL and HDL is important to get the true picture.
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