fats - Animal & Plant Fats & Oils aka Lipids...

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Unformatted text preview: Animal & Plant Fats & Oils aka Lipids Working defnition: Organic compounds (CHO) that do not mix with Water We will use the term lipids “mostly” Major food lipids ! Triglycerides ! Fat soluble vitamins: A, D, E, K ! Cholesterol ! Some plant pigments like beta-carotene ! Flavor or volatile lipids (small molecules which are soluble in lipids) Roles of lipids — lecture topics ! Energy source ! Texture ! Essential ¡atty acids ! Fat soluble vitamins: A, D, E, K ! Cholesterol ! Some plant pigments like beta-carotene ! Flavor and ¢avorings ! Heat trans¡er (“¡rying”) Caloric Values ! Physicists ! defnition: ! 1 calorie raises 1 gram o¡ water 1°C ! 1 kcal raises 1000 grams o¡ water 1°C ! (actually, modern physicists use Joules instead o¡ calories, but most nutritionists still use nomenclature related to calories) Carbohydrates 4 kcals/gram Proteins 4 kcals/gram Lipids 9 kcals/gram So we can say that Lipids have twice the amount of Kcalories as Carbohydrates* or Proteins. *digestible carbohydrates Caloric Values Caloric Values ! Physicists ! defnition: ! 1 calorie raises 1 gram oF water 1°C ! 1 kcal raises 1000 grams oF water 1°C ! Nutritionists use the term Calorie (big C) to imply kcal Recommendations for Fat Intake ! Recommendations oF the USDA“Dietary Guidelines For Americans” reF: Fats ! Choose a diet low in Fat, saturated Fat, and cholesterol ! Eat less than 30% oF total calories From Fats and oils An example of ‘low fat’ franks ! 3% Fat (by weight) ! 20% oF calories From Fat Role of Fats ! Energy source ! Texture Texture ! Textural modification in foods (Shortens protein network in bread & cake doughs) ! Smooth and moisten (baking) ! Crumbly textures ! Coatings ! Flavorful coatings ! Water resistant coatings ! Roles of Fats ! Energy source ! Texture ! Adipose tissue ! E.g. Marbling of meat ! USDA grading is based on fat distribution Prime Choice Select Standard Utility Cutter Roles of Fats ! Energy source ! Texture ! Essential fatty acids Essential fatty acids ! Are essential to proper metabolism ! Cannot be synthesized by the body ! (or at least in sufFcient amounts) ! Linoleic ( " 6) ! Linolenic ( " 3) Roles of fats ! Energy source ! Texture ! Essential fatty acids ! ¡at soluble vitamins: A, D, E, K ! Cholesterol ! These topics are for nutrition classes… Sources of Cholesterol 1.From foods we eat - Cholesterol is found in animals or meat. Cholesterol does not occur in plants. 2.Made in the body - Related to genetics (the family tree) also related to the types of fatty acids consumed in our diet. Roles of fats ! Energy source !...
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This note was uploaded on 04/15/2008 for the course BIS 1b taught by Professor Kimsey during the Spring '08 term at UC Davis.

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fats - Animal & Plant Fats & Oils aka Lipids...

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