Function of Fats Form part of cell membranes Hormones (i.e. testosterone) Store energy.
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Transcript of Function of Fats Form part of cell membranes Hormones (i.e. testosterone) Store energy.
Function of Fats
Form part of cell membranes Hormones (i.e. testosterone) Store energy
Building block: fatty acids
carboxyl group
chain of carbon and hydrogen atoms(hydrocarbon chain)
Saturated fatty acids
Packed with hydrogen atoms Line up and stick together: solid Examples: lard and butter Increase blood cholesterol
Unsaturated fatty acids
One or more double bonds: fewer hydrogens Kink prevents sticking: liquid Examples: canola and olive oil Lower blood cholesterol
Trans fatty acids
Change liquid oil into solid (i.e. shortening) Formed by hydrogenation Improved shelf life and flavor stability Raise blood cholesterol
Omega-3 fatty acids
Essential fatty acid: acquired from food Sources: salmon and flax Reduce heart disease
Omega 3 Fatty Acids
Formation of Fats
Triglycerides
Form the “flab” on our bodies Contain a lot of energy or calories Linked to coronary artery disease
Cholesterol
Component of membranes and hormones High levels: risk for coronary artery disease Transported by lipoproteins
Lipoproteins
Low density lipoprotein (LDL) “Bad” cholesterol
High density lipoprotein (HDL) “Good” cholesterol
Real Life Example
March 2010 March 2011 August 2011
Category Standard Range
Body Weight207 lbs
Body Weight197 lbs
Body Weight175lbs
CHOLESTEROL,TOTAL
110-199 mg/dL 206 178 167
TRIGLYCERIDES < 150 mg/dL 185 112 134
CHOL/HDL RATIO < 4.51 5.57 5.74 4.07
LDL CHOLESTEROL
< 131 mg/dL 132 125 99
HDL CHOLESTEROL
> 40 mg/dL 37 31 41