Anthrobio Section Two - Anthrobio Section Two: Issues in...

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Anthrobio Section Two: Issues in Contemporary Nutrition Fat: All living material has fat Functions: o Flexibility o Protection for organs – all the internal organs are surrounded by fat Types of fats: o Triglycerides o Phospholipids o Sterols o Lipoproteins Natural selection favored the ability of some to store more fat than others women can store more fat than men Wonderful insulation – provides the organs from losing too much heat – cold, fat is an insulation Most important characteristic that deals with nutrition is that fat is a vitamin carrier o Fat soluble vitamins require a certain amount of body fat o Transport vitamins from the blood into the cells o Dangers of losing too much weight too rapidly may result in loss of vitamins Can’t get rid of fat that easily because the bonds are difficult to break down Fatty Acid: Fatty acid is a chain of carbon atoms with hydrogen attached Enzymes - Bile and lipase breaks the fat down from large to small Before we use the fat we have to separate the carbon and hydrogen bonds More bonds of hydrogen means more saturated!!
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Phospholipids fat that is not good for us – when they get together with glycerol they form cholesterol (type of lipid that has various functions, provides enough storage) o Cholesterol – one of the most important components Cholesterol is found only in animal foods Type of fat that has a mixture of sterols and lipids Steak and eggs are examples of foods high in cholesterol 70% of the cholesterol is made from our own liver – we only have control of about 30% of it 30% comes from diet – CANNOT CHANGE MORE THAN THAT Lipoproteins form as a result of the union of a lipid and protein HDL – good cholesterol, LDL – bad cholesterol (both fatty acids and lipids) Liver – converts the fatty acids o Converts fatty acids into glycerol which is converted into glycogen which is eventually converted into sugar Omega 3 fatty acids – transports LDL o Olive oil provides some facility for LDL to be removed from the blood and be transported into the liver o Fish oil also a good source in omega 3 fatty acids Function is to carry LDL – the bad cholesterol from the blood into the liver where it will be used for energy Lipids: o Insoluble Quest for Energy: Metabolism – physical and chemical processes whereby the organism transforms and uses energy to sustain life Anabolism - in order to incorporate food into our tissues so they can stay (proteins) excess fatty acids are converted to fat (building) Catabolism – process whereby large molecules are breakdown into smaller ones (breaking down)
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o Energy intake of a child exceeds our abilities by 3 times
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Anthrobio Section Two - Anthrobio Section Two: Issues in...

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