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Fat

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Contents of this page:

Illustrations

Healthy diet
Healthy diet
Omega-3 fatty acids
Omega-3 fatty acids
Calories and fat per serving
Calories and fat per serving
Saturated fats
Saturated fats
Trans-fatty acids
Trans-fatty acids

Alternative names    Return to top

Saturated fat; Diet - fat; Polyunsaturated fat; Monounsaturated fat; Lipids

Definition    Return to top

Fats are organic compounds that are made up of carbon, hydrogen, and oxygen; they are the most concentrated source of energy in foods. Fats belong to a group of substances called lipids. Fats come in liquid or solid form. All fats are combinations of saturated and unsaturated fatty acids. Fats can be called very saturated or very unsaturated depending on their proportions.

Function    Return to top

Fat is one of the three nutrients (along with protein and carbohydrates) that supply calories to the body. Fat provides 9 calories per gram, more than twice the number provided by carbohydrates or protein.

Fat is essential for the proper functioning of the body. Fats provide the "essential" fatty acids, which are not made by the body and must be obtained from food. Linoleic acid is the most important essential fatty acid, especially for the growth and development of infants. Fatty acids provide the raw materials that help in the control of blood pressure, blood clotting, inflammation, and other body functions.

Fat serves as the storage substance for the body's extra calories. It fills the fat cells (adipose tissue) that help insulate the body. Fats are also an important energy source. When the body has used up the calories from carbohydrate, which occurs after the first 20 minutes of exercise, it begins to depend on the calories from fat.

Healthy skin and hair are maintained by fat. Fat helps in the absorption, and transport through the bloodstream of the fat-soluble vitamins A, D, E, and K.

Food Sources    Return to top

Side Effects    Return to top

Eating too much saturated fat is one of the major risk factors for heart disease. A diet high in saturated fat causes a soft, waxy substance called cholesterol to build up in the arteries. Too much fat also increases the risk of heart disease because of its high calorie content, which increases the chance of becoming obese (another risk factor for heart disease and some types of cancer).

A large intake of polyunsaturated fat may increase the risk for some types of cancer. Reducing daily fat intake is not a guarantee against developing cancer or heart disease, but it does help reduce the risk factors.

Recommendations    Return to top

Children under age 2 should NOT be on a fat restricted diet because cholesterol and fat are thought to be important nutrients for brain development.

It is important to read the nutrition labels and be aware of the amount of different types of fat contained in food. It is recommended that everyone over age 20 have their cholesterol checked. Talk to your health care provider about how to cut down of your fat intake and to have your cholesterol checked.

Update Date: 7/19/2004

Updated by: Kevin M. Fosnocht, M.D., Clinical Assistant Professor of Medicine, Division of General Internal Medicine, Department of Medicine, University of Pennsylvania Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

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