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Fat & Types of Fats

Fat in the food we eat and the fat in our our body is called triglycerides. Each triglyceride molecule is really three fatty acid chains attached to glycerol. An example image is shown below.

Fatty acid may be either saturated or unsaturated.
"Saturated" means saturated with hydrogen, i.e., all carbon carbon bonds are single bonds.
"Unsaturated" means one or more carbon carbon bonds are double bonds.
The term "Saturated" or "Unsaturated" really refers to fatty acid and not to a triglyceride molecule.
SFA is saturated fatty acid
MUFA is monounsaturated fatty acid (one double bond)
PUFA is polyunsaturated fatty acid (more than one double bond)

Double bond decrease melting point. 

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