1. The Skinny on Fats!! Nutrition 120

2. Why Do We NEED Fat?? ProtectionProtection InsulationInsulation EnergyEnergy Storage (Fat Soluble Vitamins)Storage (Fat Soluble Vitamins) FlavourFlavour Skin and HairSkin and Hair Build nerves and membranesBuild nerves and membranes

3. Fats – Things to Know! Scientists call fats lipidsScientists call fats lipids Fats are lipids if they are _________ at room temperature.Fats are lipids if they are _________ at room temperature. Lipids that are liquid at room temperature are called _______Lipids that are liquid at room temperature are called _______ More than 90% of the fats in our foods are called ____________ = glycerol + 3 fatty acidsMore than 90% of the fats in our foods are called ____________ = glycerol + 3 fatty acids

4. If WE need it – why is it such a problem?? OVERCONSUMPTION!OVERCONSUMPTION!

5. Fatty Acids Chains of carbon atoms with hydrogen atoms attached to the, plus an acid groupChains of carbon atoms with hydrogen atoms attached to the, plus an acid group Some fatty acid chains have only a few carbon atoms and others have 20 or moreSome fatty acid chains have only a few carbon atoms and others have 20 or more Short chains are liquid oilsShort chains are liquid oils Long chains are usually solid fats.Long chains are usually solid fats. Babies can digest short chain fatty acids easiest. Therefore, what type of fatty acid chains would be found in milk?Babies can digest short chain fatty acids easiest. Therefore, what type of fatty acid chains would be found in milk?

7. Common Fatty Acids The most common fatty acids in food contain 18 carbon atoms :The most common fatty acids in food contain 18 carbon atoms : 1.Oleic acid – found in olive oil and other plant and animal lipids 2.Stearic acid – main fatty acid in beef 3.Linoleic and linolenic – sometimes called essential fatty acids b/c our bodies cannot make them – we need to get them from foods.

9. 3 Types of Fatty Acids: 1.Saturated 2.Monounsaturated 3.Polyunsaturated The difference is the degree of saturation on hydrogen atoms!The difference is the degree of saturation on hydrogen atoms!

10. Saturated Saturated fatty acids are full – the carbon atoms in the chain are holding all the hydrogens they can.Saturated fatty acids are full – the carbon atoms in the chain are holding all the hydrogens they can. Has only single bonds throughout chain – these bonds are strong and hard to breakHas only single bonds throughout chain – these bonds are strong and hard to break Mostly found in animal products such as cheese and meat (Exception**Coconut/Palm Oils)Mostly found in animal products such as cheese and meat (Exception**Coconut/Palm Oils) Much less healthy than poly or monounsaturated sources (a diet high in these can lead to heart disease)Much less healthy than poly or monounsaturated sources (a diet high in these can lead to heart disease)

11. Unsaturated Fatty Acids Have at least one double bondHave at least one double bond There are 2 types: monounsaturated and polyunsaturatedThere are 2 types: monounsaturated and polyunsaturated

13. Monounsaturated Fatty Acids Contains only one double bond – resulting in fewer hydrogen moleculesContains only one double bond – resulting in fewer hydrogen molecules Common in plant fatsCommon in plant fats Examples are olive and peanut oilExamples are olive and peanut oil These fats are liquid at room temperatureThese fats are liquid at room temperature

15. Polyunsaturated Fatty Acids Contains two or more double bonds – resulting in even fewer hydrogen moleculesContains two or more double bonds – resulting in even fewer hydrogen molecules Common in plant fatsCommon in plant fats Examples are: corn, safflower, and soybeanExamples are: corn, safflower, and soybean These fats are liquid at room temperatureThese fats are liquid at room temperature They become rancid quicklyThey become rancid quickly The majority of our fat intake should come from unsaturated sources – the more hydrogen’s missing, the better the choice!!The majority of our fat intake should come from unsaturated sources – the more hydrogen’s missing, the better the choice!!