المساعد الشخصي الرقمي

مشاهدة النسخة كاملة : fats (( الفصل الاول ))



Mίss яăώădί
16-03-2007, 04:53 PM
Fat is an important nutrient because it gives us energy. The body stores energy as a layer of fat under the skin. This is called adipose tissue.

http://www.teachnet.ie/gmcweeney/2003/images/glycerol.JPG


Composition of Fats


Fats are made from glycerol and fatty acids. Each glycerol is attached to three fatty acids. Glycerol and fatty acids contain the elements carbon, hydrogen, and oxygen. Fats contain a lot of carbon. This is why they give us so much energy.

1 gram of fat gives us 9 kilocalories.

http://www.teachnet.ie/gmcweeney/2003/images/fats.JPG


Classification of Fats

Fats are classified into two groups:


http://www.teachnet.ie/gmcweeney/2003/images/cream.gif

Saturated Fats

(mainly from an animal source)

http://www.teachnet.ie/gmcweeney/2003/images/margarine.gif

Unsaturated Fats

(mainly from a vegetable source)

http://www.teachnet.ie/gmcweeney/2003/images/butter.gif

http://www.teachnet.ie/gmcweeney/2003/images/fish%20liver%20oils.gif


Sources of Fats


Saturated Fats come mainly from animal sources such as meat, eggs, milk and dairy produce e.g. cream and butter. There is a lot of saturated fat in butter, lard, suet and dripping.



Unsaturated Fats come mainly from plant and fish sources such as peas, beans and lentils (pulse vegetables), whole cereals, nuts, XXXXXng oil, polyunsaturated margarine and oily fish.


http://www.teachnet.ie/gmcweeney/2003/images/scrbean.gif


Functions of Fats

Fat insulates the body. A layer of fat under the skin prevents heat loss from the body.

Fat protects the delicate organs such as the kidneys and nerves. A layer of fat surrounds them.

Fats provide the body with heat and energy. This helps to keep the body at the correct temperature (37o C).

Fat is a source of the fat-soluble vitamins.




RDA of Fats

50%

Saturated
50%

Unsaturated
The RDA of fats is for a combination of saturated fat and unsaturated fat in the daily diet. It is recommended that we eat 50% saturated fat and 50% unsaturated fat in our diet. People in the western world eat too much saturated fat and it is recommended that we cut down on our intake. We should also increase our intake of unsaturated fats.







Deficiency of Fats

Fat deficiency diseases rarely occur as fat is present in a wide variety of foods. However we should not eliminate fats completely from our diet because they are also a source of the fat - soluble vitamins.
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K

D





E




To cut down on Saturated Fats

Grill rather than fry.

Use vegetable oil instead of hard fats for frying.

Remove visible fat from meat.

Look for hidden fats in the diet e.g. pastries and crisps.

Use low fat milk, cheese, yoghurt and mayonnaise.



ACTIVITIES
1. Use the Food Tables to find out the type of fat in meat.
2. What type of meat has the highest fat *******?
3. What type of meat has the lowest fat *******?.
4. Visit your local supermarket. Make a list of all low fat-foods available.
Make a note of prices and compare them with the high-fat *****alents.
5. Make a list of the foods that you ate today. Indicate which contain:
(A) animal fats
(B) vegetable fats
(C) no fat

Mίss яăώădί
16-03-2007, 08:23 PM
http://www.sfgate.com/blogs/images/sfgate/mbauer/2006/09/27/DIET_FATTY_FRIES_NY110172x250.JPG

http://www.pueblo.gsa.gov/cic_text/food/reveal-fats/qatra2ch.gif


Fats are part of most foods. We need to eat some fat to maintain good health. Different kinds of fats are reported to have different effects on health, especially heart health. The recommended daily intake of fat is 25% to 35% of total calories. Some fats have health benefits. Since fats have double the calories of protein or carbohydrates, eating less total fat is important. However, you cannot avoid all fat. Fats are found in each food group, so choose the foods that are lowest in fat as often as possible. Plan each meal so that whole grain foods, fruits, and vegetables make up three quarters of your plate. Use olive oil for XXXXXng when possible. Canola oil is a good second choice. This will help you replace some saturated and "trans" fats with heart-healthy mono- and poly-unsaturated fats. Most sauces, gravies and dressings add a lot of fat to a meal. Try using less or switching to a reduced-fat brand or try using salsa or mustard instead.

فروحة
17-03-2007, 08:15 PM
دايم الســــــيف : Thank you

روعة الإحساس
18-03-2007, 04:26 PM
شكــــــــــــرا دايم السيف .. مواضيعك رائعة ..

شكـــــــــــــــــــــــرا ...


اليوم خذنا الدرس ..


شكـــــــــــــــــــــرا ,,:rolleyes:

Mίss яăώădί
18-03-2007, 05:08 PM
مشكوورة فروحة على هالرد حلو

مشكوورة روعة الاحساس على هالرد روووعة
اليون نحن بعد خذينا هالدرس

جوهرة
24-03-2007, 07:24 PM
أنه راااااااااائع
it is super my brother

Mίss яăώădί
27-03-2007, 09:23 PM
تسلمين الغلا على هالرد الغاوي

عاشقة القصيم
31-03-2007, 07:20 PM
Thank you very much
The study very wonderfull
Good Bye, I love you friend

http://www.dm3t.com/uploads/56e13c6f03.gif (http://www.dm3t.com)

Mίss яăώădί
31-03-2007, 07:47 PM
مشكوووورة عاشقة القصيم على هالرد روووعة
لاعدمناج

moosa1
13-06-2009, 01:43 PM
لرفع الموضوع

موفقين ^^