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-Lipids are a class of nutrients that do not dissolve in water.
-- They will dissolve in organic solv
+- **Lipids** are a class of nutrients that do not dissolve in water.
+	- They will dissolve in organic solvents
+- Oil is less dense than water, so it will rise to the top of a solution
+- Major functions of lipids in the body include
+	- Providing and storing energy
+	- forming and maintaining cell membranes
+	- producing steroid hormoes
+	- insulating the body
+	- cushioning the body against bumps and blows
+	- forming body contours
+	- **absorbing fat soluble vitamins and phytochemicals**
+## Fatty Acids
+A fatty acid is a hydrocarbon chain found in lipids; one end of the chain forms a carboxylic acid, and one end forms a methyl group.
+- Short chain fatty acids have 2 to 4 carbons
+- Medium chain fatty acids have 6 to 12 acids
+- Long chan acids have 14 to 24 carbons
+- Fatty acids are identified by:
+	- The number of carbon atoms
+	- The type of bond between carbon atoms
+
+- **Saturated fatty acid (SFA)** Every single carbon atom is filled with hydrogen atoms
+- **Unsaturated fatty acid** is a fatty acid that is missing hydrogen atoms and has one or more double bonds within the carbon chain
+	- **Monounsaturated** (MUFA)
+		- Has one double bond within the carbon chain
+	- **Polyunsaturated** (PUFA)
+		- Fatty acid that has two or more bonds within the carbon chain
 # Triglycerides
 # Phospholipids
 # Sterols
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