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Fats are not as bad as we think
We may have heard about them. Our doctor may have told us to lower our fats intake because our lipids in blood are too high. Also, it seems that the word “fat” scares everyone and makes us think that we have to get rid of all fats in our diet in order to stay healthy and slim. This is not entirely true, though. Lipids, commonly known as fats, are an essential component of our cells and therefore, they should be in our diet too. Excess and a reduction in our fats intake can derive in dangerous health problems. Learn about the lipids that run through your veins and how they participate in body functions and disease.
Cholesterol: The good and the bad
Cholesterol is an essential component of our cells, specially of the cell membrane.
Our body produces cholesterol in both the liver and the small intestine; however, the food we ingest serves as an external source of cholesterol. Both internal and external cholesterol help in keeping blood cholesterol levels constant and available for cells to use it.
Cholesterol does not travel alone through the bloodstream. It has to be packed together with proteins that in conjunction form what is known as lipoproteins. Depending on their content and function, lipoproteins can be of low density (LDLs) or high density (HDLs).
There, the cholesterol that is attached to LDLs, considered the "bad cholesterol", is released and accumulates, promoting the formation of cholesterol plaques or atheroma. These plaques increase in size over time, reducing the space through which blood passes through and promoting the blockage of bloodstream and other complications.
This is the reason why HDLs are considered to be the “good cholesterol”. When reaching the liver, HDLs release their cholesterol content in order for it to be transformed and excreted in the form of bile acids.
In total, both good and bad cholesterol account for all the cholesterol that you have in blood.
Remember that your LDLs have to be at low levels, because they carry the bad type of cholesterol to your arteries, whereas HDLs levels have to be high in order for them to be enough to carry cholesterol from tissues to the liver, where it would be excreted.
Triglycerides: The ones that make us fat
Sometimes, we eat more than we need, specially food rich in fats, carbohydrates and starches.
Triglycerides are also packed, just as cholesterol, in very low density lipoproteins (VLDLs) so that they can be transported to other tissues through the bloodstream. The main sites of storage of triglycerides are the muscle and adipose tissue.