1. LIPIDS

2. Objectives 2. Investigate the properties of carbohydrates, lipids, and proteins 2.3 Describe the relationship between fatty acids and fats by providing examples to illustrate when they are useful to a living system 2.6 Indicate the component parts of a fat molecule.

3. Lipids o Lipids ______________________________________________________ ________________________________________________. They help in the absorption of vitamins, are the main component of cell membranes, and serve as insulation for the body o Certain _______________________, including sex hormones are lipids as well o Fats which we eat are made up of ______________________________ ________________________________________________ which makes up a triglyceride this triglyceride can either be saturate or unsaturated depending on the structure of their chains. o The _______________________________________________________ ___________________________________________________________. It also affects how the fat functions with in the body. Chain length also determines saturation o In a healthy diet lipids should constitute no more then _____________ of the energy intake (calories)

4. Triglyceride ________________________________________________ ________________________________________________ ________________________________________________ H – C – O – C – – (Carbon hydrogen chain) H O O H O

5. Saturated Fats o Saturated fats are usually _______________ at room temperature and are chiefly made from ______________ _______________________________________________ o Saturated fats contain __________________________in their fatty acid chains between the carbon and hydrogen. The carbon is saturated in hydrogen. o Studies have shown that people who eat a diet rich in saturated fats are often more unhealthy then those who eat a diet rich in unsaturated fats

6. Unsaturated Fats o Unsaturated fats are ____________ at room temperature, for example oils. They are mainly made from __________________________. o Unsaturated fats have ________________________________ _______________________________________________. This creates kinks in the chains. o One double bond creates a monounsaturated fat where as many double bonds create a polyunsaturated fat. o The kinks in the fatty acid chains make the lipids less dense which allows them to stay liquid at room temperature. o The more __________________________________________ ___________________________________ so polyunsaturated fats are considered healthier then monounsaturated fats

7. Essential Fatty-Acids o Some fatty acids are referred to as essential fatty acids _______________________________________________ _______________________________________________ _______________________________________________ o Ex. Omega-3 fatty acid are unsaturated and important in maintaining good health and preventing health issues such as heart disease and arthritis. It is found in oily fish, nuts, seeds and leafy greens

8. Sterols o Sterols ________________________________ _______________________________________. The most widely known human sterol is cholesterol, which serves as a precursor to steroid sex hormones testosterone and estrogen and fat-soluble vitamin o Sex hormones control the development of male and female characteristics o _______________________________________ _______________________________________ o Vitamins which are ______________________ _______________________________________ are formed by other organisms from sterols and are ingested into your system

9. Trans and Cis Fatty Acids o To emulate the desirable cooking properties of saturated fats using healthier unsaturated fats the food industry began the process of_____________________________________________________________ __________________________________________________. That is, they added hydrogen atoms to vegetable oils to create a product they thought had the best properties of both fatty acids. A common example is ___________________________________. o However this process was not fool proof. When adding the hydrogen they created an enantiomer (__________________________________________) to the healthy cis-fats; trans fats. o These trans fats are relatively straight, much like saturated fats. The different shape of cis and trans fats affects not only their physical properties but also your health. This may be because your body recognizes the trans fats as saturated fats but your body is not able to metabolize the trans fats. It is recommended that you try to avoid foods that contain trans fats

10. Phospholipids o Phospholipids are a class of lipids that are a major component of all __________________________ o Phospholipids are used in our bodies in many ways. They help ____________________________________ ____________________________________________, as our blood is composed of water lipids will not dissolve. They help ____________________________ _______________________. The exact process will be discussed in Unit 2. They aid in the _______________ ___________________________ and are used in the _____________________________________________

11. Why do we need fats? o __________________________________________fat has twice the energy per gram than carbohydrates or proteins o _________________________________________our cells are getting lots of oxygen while resting so we can break down fat o _____________________________________our body signals change in hormones to release adrenaline and decrease insulin so we can use fat for energy instead of glucose o ____________________________________________________ our body stores extra energy in the form of fat for us to use when resting, exercising, and not eating o ____________________________________________________ __________we need various vitamins for essential metabolic processes that fats transport to area they need to be

12. Why do we need fats con’t o __________________________________________________ it is a critical part of the cell membrane integrity and regulates what substances go into and out of the cell and what binds the cell o ___________________________________________________ protect organs and provides insulation o __________________________________________________ makes food creamy, moist, tender and crispy o __________________________________________________ makes us feel full after eating

13. Fat Replacers o Just as with artificial sweeteners scientists have developed fat replacers which act like fat in food. They can be ________________________________. o One non caloric fat replacer called ______________ interfered with the absorption of nutrients and gave those who ingested it _________________________ ___________________________________________ o Carbohydrate and protein based fat replacers have been shown to be safe with current research

14. Fat Blockers o Fat blockers are substances that ________________ ___________________________________________ o ___________________________________________ ___________________________________________ ___________________________________________ o Research says they are moderately effective but include many side effects such as abdominal pain and flatulence