polyunsaturated fat

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Related to polyunsaturated fat: Saturated fats, Monounsaturated fat


1. the adipose tissue of the body.
2. a triglyceride (or triacylglycerol) that is an ester of fatty acids and glycerol. Each fat molecule contains one glycerol residue connected by ester linkages to three fatty acid residues, which may be the same or different. The fatty acids may have no double bonds in the carbon chain (saturated fatty acids), one double bond (monounsaturated), or two or more double bonds (polyunsaturated). Essential fatty acids cannot be synthesized by the body but must be obtained from the diet or from intravenous infusion of lipids.
Saturated and Unsaturated Fats. All of the common unsaturated fatty acids are liquid (oils) at room temperature. Through the process of hydrogenation, hydrogen can be incorporated into certain unsaturated fatty acids so that they are converted into solid fats for cooking purposes. Margarine is an example of the hydrogenation of unsaturated fatty acids into a solid substance.
brown fat a thermogenic type of adipose tissue containing a dark pigment, and arising during embryonic life in certain specific areas in many mammals, including humans (see illustration); it is prominent in the newborn. Called also brown adipose tissue.
Sites of brown fat in the neonate. From McKinney et al., 2000.
neutral fat fat (def. 2).
polyunsaturated fat a fat containing polyunsaturated fatty acids; see also fat.
saturated fat a fat containing saturated fatty acids; see also fat.
unsaturated fat a fat containing unsaturated fatty acids; see also fat.

polyunsaturated fat

A saturated fatty acid (i.e., an alkyl-chain fatty acid) with two or more ethylenic carbon–carbon double bonds; because of the double bond, not every carbon is saturated with hydrogen atoms—i.e., there are fewer hydrogens—which reduces the strength of the compound's intermolecular forces, resulting in a significant lowering of the compound’s melting point.

Polyunsaturated fats in humans
• Linoleic PFAs—two double bonds between 9/10 (Δ9) and 12/13 (Δ12); e.g., CnH2n-COOH.
• Linolenic PFAs—three double bonds, Δ9, Δ12, Δ15; e.g., CnH2n-5-COOH.
• 4-doubled bond PFAs—four double bonds, Δ5, Δ8, Δ11, Δ14; e.g., arachidonic acid.

pol·y·un·sa·tu·ra·ted fat

(pol'ē-ŭn-sach'ŭr-ā-tĕd fat)
A type of unsaturated fat. Diets high in unsaturated fat produce lower cholesterol levels.
References in periodicals archive ?
Professor Jeremy Pearson, associate medical director at the British Heart Foundation, which helped fund the study, added: "This analysis of existing data suggests there isn't enough evidence to say that a diet rich in polyunsaturated fats but low in saturated fats reduces the risk of cardiovascular disease.
Polyunsaturated fats are found in certain vegetable oils, fish and green leafy vegetables.
The diet was also "too low in polyunsaturated fats.
As a result, many shift workers consume large amounts of linoleic acid just when their melatonin production is suppressed and unable to protect them from the polyunsaturated fat, he says.
Swapping foods which are high in bad saturated fats with foods containing good polyunsaturated fats can help lower your levels of bad (LDL) cholesterol, which is beneficial for your heart health.
Studies in persons with diabetes demonstrating effects of specific percentage intakes of dietary saturated fat and polyunsaturated fat and specific amounts of dietary cholesterol are limited (4).
Omega 3 essential fatty acids are a type of polyunsaturated fat.
Another interesting finding was that, among our subjects, women who reported low intakes of polyunsaturated fats while showing the highest levels of trans fatty acids had the greatest risk of breast cancer.
Avocados are virtually the only fruit that has monounsaturated fat, the fruit also contributes polyunsaturated fat (0.
Excess saturated fat may lead to more belly fat than excess polyunsaturated fat.
25 ( ANI ): Researchers from Uppsala University have shown that saturated fat builds more fat and less muscle than polyunsaturated fat.