Chapter%205_Fats%20Oils%20Lipids_2011

Chapter%205_Fats%20Oils%20Lipids_2011 - 9/12/2011 Chapter 5...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
9/12/2011 1 Chapter 5 Fats, Oils, and Other Lipids and Other Lipids HPEB 502 Fall 2011 What Are Fats and Why Do You Need Them? Lipids: category of compounds containing carbon, hydrogen and oxygen that are hydrophobic (insoluble in water) Fats: Three types of lipids: Lipid Functions in the Body Lipids perform important functions in the body:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/12/2011 2 Fatty Acids Vary in Length and Structure Fatty acids: chain of carbon and hydrogen atoms with acid group (-COOH at one end) Found in and Variations in fatty acids - Types of Fatty Acids Saturated fatty acids: all carbons bonded to hydrogen Unsaturated fatty acids: 1 or more double bond between carbons (less saturated with hydrogen) Monounsaturated fatty acid: Polyunsaturated fatty acid: Triglycerides Triglyceride: three fatty acids connected to glycerol backbone Most common lipid found in foods and body Referred to as fats Saturated fats have mostly saturated fatty acids Unsaturated fats have mostly unsaturated fatty acids
Background image of page 2
9/12/2011 3 Phospholipids Phospholipids: have glycerol backbone but two fatty acids and a phosphorus group Phosphorus-containing head is hydrophilic Fatty-acid tail is hydrophobic See Figure 5.7 for salad dressing visual Sterols Sterols are comprised mainly of four connecting rings of carbon and hydrogen. Cholesterol Digesting Fat Mouth Stomach Small intestine Bile acids Pancreatic lipase Lecithin in bile packaged with monoglycerides and fatty acids to create micelles for absorption Short-chain fatty acids enter bloodstream and travel to liver Long-chain fatty acids enter lymph and need transport carriers
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/12/2011 4 Fat Absorption Lipoproteins transport fat through the lymph and blood. Chylomicrons: Very low-density lipoproteins (VLDL): Low- density lipoproteins (LDL, “bad” cholesterol): High-density lipoproteins (HDL, “good” cholesterol): How Does Your Body Use Fat? Fat An energy-dense source of fuel: _________/gram Functions in the body: Essential Fatty Acids Essential fatty acids make eicosanoids and help keep cell membranes healthy.
Background image of page 4
9/12/2011 5 Linoleic Acids Linoleic acid is used to make arachidonic acid which is important for cells and for making eicosanoids (which are hormone-like substances involved in inflammation, blood clotting, blood pressure) Linoleic acid deficiency interferes with normal growth and causes skin inflammation Food sources (Figure 5.14)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/20/2012 for the course HPEB 502 taught by Professor Montgomery during the Fall '09 term at South Carolina.

Page1 / 14

Chapter%205_Fats%20Oils%20Lipids_2011 - 9/12/2011 Chapter 5...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online