11-Fats _ Oils-12

fats are semi solids at room temperature oils are

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: s the difference? ! ! Fats are (semi)-solids at room temperature Oils are liquid at room temperature Normal hydrolysis of triglycerides breaking off the fatty acids (blue) by lipase (orange) FST10 ©GMS/GFR 2012 Percentages of Fat — The Games People Play ! ! For example; “95% Fat Free” means 5% fat Nutritionists recommend <30% (+/-) by Calories ! ! Lift pencils for a moment . . . Food industry labels fat% by weight and they like to tell you how fat isn!t there ! FST10 ©GMS/GFR 2012 And they think "calories! for diets These 2 numbers can be very different FST10 ©GMS/GFR 2012 Fat Content - Example 1 Fat Content - Example 1 Calculate % calories from fat We’ll use this to examine fat content ! 100 grams of food (no water — dry food) ! 70 grams of CHO!s and protein Could be labeled 70% "fat free! (30% fat) Since the labeling refers to % by weight 100 grams of food (no water, just dry food) ! 30 g of from fat ! 70 g of CHOs and protein ! So, remember it!s 30% fat by weight ! Calculate calories: ! 30 x 9# # ! 70 x 4# # !T otal kcal# 30 grams of fat ! ! ! ! ! = 270 kcal (fat) = 280 kcal (CHO!s & protein) = 550 kcal % fat by calories = 270/550 x 100 = 49% (almost half) FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 Fat Content - Example 2 ! What would happen if we added 5 times the amount of water? ! ! 70 grams of CHO!s and protein ! ! 30 grams of fat ! Fat Content - Example 2 500 grams of water for a total of 600 g of food Calculate the calories: Fat# # # CHO/Protein# Water# # Total# # ! The % fat by weight is now 30/600 x 100 = 5% ! ! Could be labeled "95% fat free! (5% fat) ! 30 x 9# # 70 x 4# # 500 x 0# # # # The % fat by weight now = 30/600*100 = 5% % fat by calories = 270/550 x 100 = 49% Bottom line: ! It!s now “95% fat free” ! But the % calories from fat is the same (almost half) FST10 ©GMS/GFR 2012 More bottom line ... ! ! By diluting a food with water, the % fat # (by weight) will go down However, just diluting with water does not change the % of calories from fat = 270 kcal = 280 kcal = 000 kcal = 550 kcal FST10 ©GMS/GFR 2012 An example of ‘low fat’ franks ! ! 3% fat (by weight) 20% of calories from fat (all other things being equal) FST10 ©GMS/GFR 2012 FST10 ©GMS/GFR 2012 Another example ... With high water content ... FST10 ©GMS/GFR 2012 For Low-Fat types For Low-Fat types ! Simplesse™ (made by NutriSweet & CP-Kelco) ! However, “up to 1% fat” is OK made from dairy & egg proteins ! can be formulated as a powder ! may have problems with heating ! 1 calorie vs. 9 calories FST10 ©GMS/GFR 2012 For Low-Fat types ! ! ! Olestra (Olean™ — Proctor & Gamble) Olestra — Controversial Get the facts about Olean brand olestra, the no-fat cooking oil with the full-fat flavor! Here you'll find the specific information you're looking for about olestra and your favorite snacks. Just click on the topic you would like to know about or type a word or phrase in the search box. The Olean and Healthy Snacking segment airing on Chemically bonds fat...
View Full Document

Ask a homework question - tutors are online